<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fb4cf-922d-751a-930f-03cb10446f6e,g:6a34a7ca-f990-4dd7-a445-cda1c5059340-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/DocumentAndEntityInformation" xlink:type="simple" xlink:href="grbk-20260930.xsd#DocumentAndEntityInformation"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/DocumentAndEntityInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019fb4cf-92c1-74e7-9ad2-abb51a35c63e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntitiesTable_019fb4cf-92c1-74e7-9ad2-abb51a35c63e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fb4cf-92c1-75aa-9afa-cf7bd85035eb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019fb4cf-92c1-74e7-9ad2-abb51a35c63e" xlink:to="loc_dei_LegalEntityAxis_019fb4cf-92c1-75aa-9afa-cf7bd85035eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fb4cf-92c1-75aa-9afa-cf7bd85035eb_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019fb4cf-92c1-75aa-9afa-cf7bd85035eb" xlink:to="loc_dei_EntityDomain_019fb4cf-92c1-75aa-9afa-cf7bd85035eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fb4cf-92c1-7f22-b49a-82f18f8562d4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019fb4cf-92c1-75aa-9afa-cf7bd85035eb" xlink:to="loc_dei_EntityDomain_019fb4cf-92c1-7f22-b49a-82f18f8562d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019fb4cf-92c1-7b2a-ac0b-47e005650d30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019fb4cf-92c1-74e7-9ad2-abb51a35c63e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019fb4cf-92c1-7b2a-ac0b-47e005650d30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-7b2a-ac0b-47e005650d30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fb4cf-92c1-7b2a-ac0b-47e005650d30" xlink:to="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-7b2a-ac0b-47e005650d30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-70e4-abe4-684aa42541e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fb4cf-92c1-7b2a-ac0b-47e005650d30" xlink:to="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-70e4-abe4-684aa42541e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fb4cf-92c1-7d46-bbf2-7a8995bd54e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-70e4-abe4-684aa42541e3" xlink:to="loc_us-gaap_CommonStockMember_019fb4cf-92c1-7d46-bbf2-7a8995bd54e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019fb4cf-92c1-7af1-b872-3381f0710303" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fb4cf-92c1-70e4-abe4-684aa42541e3" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019fb4cf-92c1-7af1-b872-3381f0710303" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_019fb4cf-92c1-7a68-b868-eb0a7671cc16" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019fb4cf-92c1-74e7-9ad2-abb51a35c63e" xlink:to="loc_dei_EntityListingsExchangeAxis_019fb4cf-92c1-7a68-b868-eb0a7671cc16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019fb4cf-92c1-7a68-b868-eb0a7671cc16_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_019fb4cf-92c1-7a68-b868-eb0a7671cc16" xlink:to="loc_dei_ExchangeDomain_019fb4cf-92c1-7a68-b868-eb0a7671cc16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019fb4cf-92c1-752f-adba-008a0b716aa9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_019fb4cf-92c1-7a68-b868-eb0a7671cc16" xlink:to="loc_dei_ExchangeDomain_019fb4cf-92c1-752f-adba-008a0b716aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XCHI_019fb4cf-92c1-7e41-92ae-f8ddbac2d37f" xlink:href="https://xbrl.sec.gov/exch/2026/exch-2026.xsd#exch_XCHI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019fb4cf-92c1-752f-adba-008a0b716aa9" xlink:to="loc_exch_XCHI_019fb4cf-92c1-7e41-92ae-f8ddbac2d37f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNYS_019fb4cf-92c1-76de-b644-bab4e460ca00" xlink:href="https://xbrl.sec.gov/exch/2026/exch-2026.xsd#exch_XNYS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019fb4cf-92c1-752f-adba-008a0b716aa9" xlink:to="loc_exch_XNYS_019fb4cf-92c1-76de-b644-bab4e460ca00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a1594f-423d-7299-bc34-9c201237aace" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentType_01a1594f-423d-7299-bc34-9c201237aace" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_01a1594f-5698-765c-b13b-ca942fcc8082" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentQuarterlyReport_01a1594f-5698-765c-b13b-ca942fcc8082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a1594f-653f-7d18-b9ca-1be7a3dee12e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentPeriodEndDate_01a1594f-653f-7d18-b9ca-1be7a3dee12e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_01a1594f-7633-7a16-b29a-750daa10c30a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentTransitionReport_01a1594f-7633-7a16-b29a-750daa10c30a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a1594f-84af-7e11-b139-6631c95ca0c9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityFileNumber_01a1594f-84af-7e11-b139-6631c95ca0c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a1594f-9480-781a-967d-da19e313b902" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityRegistrantName_01a1594f-9480-781a-967d-da19e313b902" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a1594f-b208-78ec-a5ca-84d64d418146" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a1594f-b208-78ec-a5ca-84d64d418146" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a1594f-b208-712e-822c-61f196cf7313" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityAddressAddressLine1_01a1594f-b208-712e-822c-61f196cf7313" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_01a1594f-b208-7780-858b-8cf23acb1140" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityAddressAddressLine2_01a1594f-b208-7780-858b-8cf23acb1140" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a1594f-b208-7d17-a86b-9cfe349047f8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a1594f-b208-7d17-a86b-9cfe349047f8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a1594f-b208-78fb-9f98-d5cce76f5bc5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityAddressCityOrTown_01a1594f-b208-78fb-9f98-d5cce76f5bc5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a1594f-b208-7322-9b9a-2f695ab41ae4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityAddressStateOrProvince_01a1594f-b208-7322-9b9a-2f695ab41ae4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a1594f-b208-76c7-8b9d-ab3ed7e148d2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityAddressPostalZipCode_01a1594f-b208-76c7-8b9d-ab3ed7e148d2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a1594f-b208-709a-b079-17c3459d86df" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_CityAreaCode_01a1594f-b208-709a-b079-17c3459d86df" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a1594f-b208-7597-a11e-9909b1471d2f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_LocalPhoneNumber_01a1594f-b208-7597-a11e-9909b1471d2f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a1594f-c743-7a6b-aafa-f3fda8aeb2c9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_Security12bTitle_01a1594f-c743-7a6b-aafa-f3fda8aeb2c9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a1594f-c743-7d76-a438-9c9a0b91c936" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_TradingSymbol_01a1594f-c743-7d76-a438-9c9a0b91c936" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a1594f-c743-7af0-93ca-8858deec9f23" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_SecurityExchangeName_01a1594f-c743-7af0-93ca-8858deec9f23" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_01a15952-04bb-79b3-be41-0eb0a9351ee1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityCurrentReportingStatus_01a15952-04bb-79b3-be41-0eb0a9351ee1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_01a15952-04bb-75bb-9dd3-c705512e98b5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityInteractiveDataCurrent_01a15952-04bb-75bb-9dd3-c705512e98b5" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_01a15952-04bb-749b-a673-0e998856f2e6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityFilerCategory_01a15952-04bb-749b-a673-0e998856f2e6" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_01a15952-04bb-7c58-8519-4c4747446ed6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntitySmallBusiness_01a15952-04bb-7c58-8519-4c4747446ed6" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a15952-04bb-722b-a027-b60b8ce1d1b7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a15952-04bb-722b-a027-b60b8ce1d1b7" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_01a15952-04bb-7621-b22a-c460042a9362" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityShellCompany_01a15952-04bb-7621-b22a-c460042a9362" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_01a15952-1fd2-7a13-9deb-5337ab0932c2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_01a15952-1fd2-7a13-9deb-5337ab0932c2" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a15952-3b3d-7619-a468-700c0617590b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_EntityCentralIndexKey_01a15952-3b3d-7619-a468-700c0617590b" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a15952-3b3d-7bf3-bd8c-635b780284fd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_AmendmentFlag_01a15952-3b3d-7bf3-bd8c-635b780284fd" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_01a15952-3b3d-74da-9332-b55549680c59" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_CurrentFiscalYearEndDate_01a15952-3b3d-74da-9332-b55549680c59" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_01a15952-3b3d-7791-93e1-5ab60f8f5682" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentFiscalYearFocus_01a15952-3b3d-7791-93e1-5ab60f8f5682" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_01a15952-3b3d-7e86-9612-99e190b0b05c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a1594f-423d-74a4-ae5f-db2d247afeb5" xlink:to="loc_dei_DocumentFiscalPeriodFocus_01a15952-3b3d-7e86-9612-99e190b0b05c" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="grbk-20260930.xsd#CondensedConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019fb4cf-9359-7f40-bd1d-ba9316533af2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_StatementTable_019fb4cf-9359-7f40-bd1d-ba9316533af2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019fb4cf-9359-7eee-b6bf-6b431f12ebf2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019fb4cf-9359-7f40-bd1d-ba9316533af2" xlink:to="loc_srt_ProductOrServiceAxis_019fb4cf-9359-7eee-b6bf-6b431f12ebf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fb4cf-9359-7eee-b6bf-6b431f12ebf2_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019fb4cf-9359-7eee-b6bf-6b431f12ebf2" xlink:to="loc_srt_ProductsAndServicesDomain_019fb4cf-9359-7eee-b6bf-6b431f12ebf2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019fb4cf-9359-766a-9448-d0ce51200780" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019fb4cf-9359-7eee-b6bf-6b431f12ebf2" xlink:to="loc_srt_ProductsAndServicesDomain_019fb4cf-9359-766a-9448-d0ce51200780" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeBuildingMember_019fb4cf-9359-7693-9b3d-7569f48b7498" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019fb4cf-9359-766a-9448-d0ce51200780" xlink:to="loc_us-gaap_HomeBuildingMember_019fb4cf-9359-7693-9b3d-7569f48b7498" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_019fb4cf-9359-76e3-890a-a591600cf399" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HomeBuildingMember_019fb4cf-9359-7693-9b3d-7569f48b7498" xlink:to="loc_us-gaap_ResidentialRealEstateMember_019fb4cf-9359-76e3-890a-a591600cf399" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherMember_019fb4cf-9359-7c29-8c6c-c762cc7448a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HomeBuildingMember_019fb4cf-9359-7693-9b3d-7569f48b7498" xlink:to="loc_us-gaap_RealEstateOtherMember_019fb4cf-9359-7c29-8c6c-c762cc7448a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_01a1595c-12a1-79b1-b6ab-8ca20b957fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_RevenuesAbstract_01a1595c-12a1-79b1-b6ab-8ca20b957fe6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fb4cf-9359-760e-8fd9-84601320e092" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_01a1595c-12a1-79b1-b6ab-8ca20b957fe6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019fb4cf-9359-760e-8fd9-84601320e092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_FinancialServicesRevenue_01a168d5-4183-7186-8d14-d7a89a9f254a" xlink:href="grbk-20260930.xsd#grbk_FinancialServicesRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_01a1595c-12a1-79b1-b6ab-8ca20b957fe6" xlink:to="loc_grbk_FinancialServicesRevenue_01a168d5-4183-7186-8d14-d7a89a9f254a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_01a168d6-3754-764b-9c8b-e25b5acc2223" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_01a1595c-12a1-79b1-b6ab-8ca20b957fe6" xlink:to="loc_us-gaap_Revenues_01a168d6-3754-764b-9c8b-e25b5acc2223" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_01a1595c-568e-7a30-8422-a0567bf5bc81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSoldAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_01a1595c-568e-7a30-8422-a0567bf5bc81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019fb4cf-9359-7ea3-9f06-034e42f1f2ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_01a1595c-568e-7a30-8422-a0567bf5bc81" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019fb4cf-9359-7ea3-9f06-034e42f1f2ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_FinancialServicesExpenses_019fb4cf-9359-7697-ae73-9fc9d384185b" xlink:href="grbk-20260930.xsd#grbk_FinancialServicesExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_grbk_FinancialServicesExpenses_019fb4cf-9359-7697-ae73-9fc9d384185b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fb4cf-9359-78ac-ba9b-2ac27d279691" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019fb4cf-9359-78ac-ba9b-2ac27d279691" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019fb4cf-9359-75ef-9c15-afccfb9fcab9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019fb4cf-9359-75ef-9c15-afccfb9fcab9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019fb4cf-9359-743f-9dbe-bf3914750e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019fb4cf-9359-743f-9dbe-bf3914750e5e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fb4cf-9359-7a17-8741-719b1d0727cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fb4cf-9359-7a17-8741-719b1d0727cc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fb4cf-9359-7410-a2dd-ae925a05e141" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fb4cf-9359-7410-a2dd-ae925a05e141" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fb4cf-9359-72a4-b414-d4fe9bc172ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_ProfitLoss_019fb4cf-9359-72a4-b414-d4fe9bc172ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019fb4cf-9359-70f9-a8bd-6a94816d7f90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019fb4cf-9359-70f9-a8bd-6a94816d7f90" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019fb4cf-9359-7081-b904-2401f6e2c51d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7359-acb6-9b7cad969b5c" xlink:to="loc_us-gaap_NetIncomeLoss_019fb4cf-9359-7081-b904-2401f6e2c51d" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="simple" xlink:href="grbk-20260930.xsd#CondensedConsolidatedStatementsofChangesinStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/CondensedConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fb4cf-9359-7c0a-a219-396a83933e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019fb4cf-9359-75e0-99c5-4c0c368a1d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7c0a-a219-396a83933e7b" xlink:to="loc_us-gaap_StatementTable_019fb4cf-9359-75e0-99c5-4c0c368a1d3b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019fb4cf-9359-72b0-8569-e6a4c1a4e11a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019fb4cf-9359-75e0-99c5-4c0c368a1d3b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019fb4cf-9359-72b0-8569-e6a4c1a4e11a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-72b0-8569-e6a4c1a4e11a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019fb4cf-9359-72b0-8569-e6a4c1a4e11a" xlink:to="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-72b0-8569-e6a4c1a4e11a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-7ae9-86e5-45dfc37421c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019fb4cf-9359-72b0-8569-e6a4c1a4e11a" xlink:to="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-7ae9-86e5-45dfc37421c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-7ae9-86e5-45dfc37421c2" xlink:to="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fb4cf-9359-7582-b7d9-5ae3f562660c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:to="loc_us-gaap_CommonStockMember_019fb4cf-9359-7582-b7d9-5ae3f562660c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_01a15974-4ee5-7898-b0ec-625f07060817" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:to="loc_us-gaap_PreferredStockMember_01a15974-4ee5-7898-b0ec-625f07060817" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019fb4cf-9359-76b4-aeee-aa6fe2effd80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019fb4cf-9359-76b4-aeee-aa6fe2effd80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019fb4cf-9359-717f-be9e-4e2cee2def79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019fb4cf-9359-717f-be9e-4e2cee2def79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019fb4cf-9359-7d66-8331-ff00ac040ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019fb4cf-9359-7de7-8ce3-d05387e2f462" xlink:to="loc_us-gaap_RetainedEarningsMember_019fb4cf-9359-7d66-8331-ff00ac040ffb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019fb4cf-9359-7c8b-866b-25601cdd2dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019fb4cf-9359-7ae9-86e5-45dfc37421c2" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019fb4cf-9359-7c8b-866b-25601cdd2dd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7c0a-a219-396a83933e7b" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a15981-f4c9-7857-a275-60a3ba2b00f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_01a15981-f4c9-7857-a275-60a3ba2b00f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a15981-f4c9-7b98-84ad-a581b7bac5c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a15981-f4c9-7b98-84ad-a581b7bac5c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_01a15982-a735-7c9a-b14d-b6b8ca3a710f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_01a15982-a735-7c9a-b14d-b6b8ca3a710f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a15983-741a-7181-b6a1-4f37cac6286a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_TreasuryStockCommonShares_01a15983-741a-7181-b6a1-4f37cac6286a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_01a15983-e33d-7735-ae64-1212b0bb61f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited_01a15983-e33d-7735-ae64-1212b0bb61f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a15985-af6d-7544-89f5-e960df634a9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a15985-af6d-7544-89f5-e960df634a9b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_01a15985-af6d-700d-a5c8-b21aa9067790" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_01a15985-af6d-700d-a5c8-b21aa9067790" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_01a15985-af6d-7ce5-b718-2f4a39888d7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_01a15985-af6d-7ce5-b718-2f4a39888d7c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_01a15985-af6d-713a-b952-fa5437936b48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_01a15985-af6d-713a-b952-fa5437936b48" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a15983-e33d-7f5b-a591-909ea0318ab5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a15983-e33d-7f5b-a591-909ea0318ab5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Dividends_01a15983-e33d-765d-96e2-5ebfb80d1f90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Dividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_Dividends_01a15983-e33d-765d-96e2-5ebfb80d1f90" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a15983-e33d-752f-ad10-ff803ec0311c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a15983-e33d-752f-ad10-ff803ec0311c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_01a15983-e33d-7051-bd97-73b013220294" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_01a15983-e33d-7051-bd97-73b013220294" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesRetired_01a15983-e33d-7d7e-93aa-ab64963cb946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockSharesRetired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_TreasuryStockSharesRetired_01a15983-e33d-7d7e-93aa-ab64963cb946" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockRetiredCostMethodAmount_01a15983-e33d-7eac-a50e-0e9c1e9a2153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockRetiredCostMethodAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_TreasuryStockRetiredCostMethodAmount_01a15983-e33d-7eac-a50e-0e9c1e9a2153" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestChangeInRedemptionValue_01a15983-e33d-7c5b-a2f2-b1140568ef6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestChangeInRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_MinorityInterestChangeInRedemptionValue_01a15983-e33d-7c5b-a2f2-b1140568ef6f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_01a15985-af6d-710c-804b-4e4fbb323066" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_01a15985-af6d-710c-804b-4e4fbb323066" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_01a15983-e33d-751b-b289-acb81b5a7528" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a15966-66d1-7ffa-9ef2-26f2638bba68" xlink:to="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_01a15983-e33d-751b-b289-acb81b5a7528" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a15981-f4c9-727f-9bc6-e8b966c5664d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_01a15981-f4c9-7a16-9b85-2806e50654c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a15982-3ee5-7b53-bfeb-93ce82d686a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a15982-0b38-76fc-893a-260f055b63a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_01a16395-c9f6-7dc1-9f5b-aaef06f06a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fb4cf-9359-7c0a-a219-396a83933e7b" xlink:to="loc_us-gaap_CommonStockSharesIssued_01a16395-c9f6-7dc1-9f5b-aaef06f06a7a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofUnconsolidatedEntitiesDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofUnconsolidatedEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofUnconsolidatedEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599c-dbd6-7975-a65c-c3cbfe56f89d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599c-dbd6-7e0c-b1bb-02eaadda4a53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599c-dbd6-7975-a65c-c3cbfe56f89d" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599c-dbd6-7e0c-b1bb-02eaadda4a53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a1599c-dbd6-741e-9387-7ca4cc9ce944" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599c-dbd6-7e0c-b1bb-02eaadda4a53" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a1599c-dbd6-741e-9387-7ca4cc9ce944" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-741e-9387-7ca4cc9ce944_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a1599c-dbd6-741e-9387-7ca4cc9ce944" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-741e-9387-7ca4cc9ce944_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a1599c-dbd6-741e-9387-7ca4cc9ce944" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_RainwaterCrossingSingleFamilyMember_01a1599c-dbd6-7194-9fea-3b3a3a146231" xlink:href="grbk-20260930.xsd#grbk_RainwaterCrossingSingleFamilyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:to="loc_grbk_RainwaterCrossingSingleFamilyMember_01a1599c-dbd6-7194-9fea-3b3a3a146231" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_GBTMSenderaLLCMember_01a1599c-dbd6-7387-9d1a-cc6b82951544" xlink:href="grbk-20260930.xsd#grbk_GBTMSenderaLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:to="loc_grbk_GBTMSenderaLLCMember_01a1599c-dbd6-7387-9d1a-cc6b82951544" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_EJBRiverHoldingsLLCMember_01a1599c-dbd6-73a0-b25d-892d140074c0" xlink:href="grbk-20260930.xsd#grbk_EJBRiverHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:to="loc_grbk_EJBRiverHoldingsLLCMember_01a1599c-dbd6-73a0-b25d-892d140074c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_TMGBMagnoliaRidgeMember_01a1599c-dbd6-7e63-bbe6-6e79ff68d3c7" xlink:href="grbk-20260930.xsd#grbk_TMGBMagnoliaRidgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a1599c-dbd6-739e-a725-3e4199da5f44" xlink:to="loc_grbk_TMGBMagnoliaRidgeMember_01a1599c-dbd6-7e63-bbe6-6e79ff68d3c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_01a1599c-dbd6-7d5f-a53e-41b5160f0e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599c-dbd6-7975-a65c-c3cbfe56f89d" xlink:to="loc_us-gaap_EquityMethodInvestments_01a1599c-dbd6-7d5f-a53e-41b5160f0e9b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/InvestmentsinConsolidatedandUnconsolidatedEntitiesNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#InvestmentsinConsolidatedandUnconsolidatedEntitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/InvestmentsinConsolidatedandUnconsolidatedEntitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a159b5-0630-794a-beda-5e1ff70df144" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a159b5-0630-794a-beda-5e1ff70df144" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159b5-0630-75ad-a68d-71e572300fbf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a159b5-0630-794a-beda-5e1ff70df144" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159b5-0630-75ad-a68d-71e572300fbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-75ad-a68d-71e572300fbf_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159b5-0630-75ad-a68d-71e572300fbf" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-75ad-a68d-71e572300fbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-73fe-a0e9-af3e8b395e99" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159b5-0630-75ad-a68d-71e572300fbf" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-73fe-a0e9-af3e8b395e99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_RainwaterCrossingSingleFamilyMember_01a159b5-0630-75dd-a2fb-733a69d09da6" xlink:href="grbk-20260930.xsd#grbk_RainwaterCrossingSingleFamilyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-73fe-a0e9-af3e8b395e99" xlink:to="loc_grbk_RainwaterCrossingSingleFamilyMember_01a159b5-0630-75dd-a2fb-733a69d09da6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_TMGBMagnoliaRidgeMember_01a159b5-9513-7f98-9520-0fba8020731f" xlink:href="grbk-20260930.xsd#grbk_TMGBMagnoliaRidgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a159b5-0630-73fe-a0e9-af3e8b395e99" xlink:to="loc_grbk_TMGBMagnoliaRidgeMember_01a159b5-9513-7f98-9520-0fba8020731f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a159bf-e136-77ec-8de7-544b3d6bf058" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a159b5-0630-794a-beda-5e1ff70df144" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a159bf-e136-77ec-8de7-544b3d6bf058" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a159bf-e136-77ec-8de7-544b3d6bf058_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a159bf-e136-77ec-8de7-544b3d6bf058" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a159bf-e136-77ec-8de7-544b3d6bf058_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a159bf-e136-7fbb-be86-0c91b9a13fe5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a159bf-e136-77ec-8de7-544b3d6bf058" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a159bf-e136-7fbb-be86-0c91b9a13fe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a159bf-e136-7c8e-8012-d500fe3b4c56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a159bf-e136-7fbb-be86-0c91b9a13fe5" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a159bf-e136-7c8e-8012-d500fe3b4c56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_01a159b5-0630-773a-bc8c-837964904df5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_01a159b5-0630-773a-bc8c-837964904df5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_RemainingCommitmentToFundCapital_01a159b5-0630-7d4e-9520-d5b1acebb5c9" xlink:href="grbk-20260930.xsd#grbk_RemainingCommitmentToFundCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:to="loc_grbk_RemainingCommitmentToFundCapital_01a159b5-0630-7d4e-9520-d5b1acebb5c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_01a159bf-e136-701b-b6a2-85aed32801ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:to="loc_us-gaap_Assets_01a159bf-e136-701b-b6a2-85aed32801ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_01a159bf-e136-7477-8cdd-03fb3e886124" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a159b5-0630-78fa-8177-b875e3967c90" xlink:to="loc_us-gaap_Liabilities_01a159bf-e136-7477-8cdd-03fb3e886124" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofFinancialInformationofUnconsolidatedEntitiesDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofFinancialInformationofUnconsolidatedEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/InvestmentinConsolidatedandUnconsolidatedEntitiesSummaryofFinancialInformationofUnconsolidatedEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599e-eeb3-72b5-ba0d-cec355feb1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599e-eeb3-72b5-ba0d-cec355feb1d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_01a1599e-eeb3-775a-8a62-dbe59a69436f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599e-eeb3-72b5-ba0d-cec355feb1d6" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_01a1599e-eeb3-775a-8a62-dbe59a69436f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_01a1599e-eeb3-775a-8a62-dbe59a69436f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_01a1599e-eeb3-775a-8a62-dbe59a69436f" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_01a1599e-eeb3-775a-8a62-dbe59a69436f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_01a1599e-eeb3-7389-b748-89143c3249ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_01a1599e-eeb3-775a-8a62-dbe59a69436f" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_01a1599e-eeb3-7389-b748-89143c3249ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember_01a1599e-eeb3-76a7-b021-6b9f53a8d7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_01a1599e-eeb3-7389-b748-89143c3249ec" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember_01a1599e-eeb3-76a7-b021-6b9f53a8d7e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159ab-fd3e-7b29-8a91-49fd5350e5df" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_01a1599e-eeb3-72b5-ba0d-cec355feb1d6" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159ab-fd3e-7b29-8a91-49fd5350e5df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a159ab-fd3e-7b29-8a91-49fd5350e5df_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159ab-fd3e-7b29-8a91-49fd5350e5df" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a159ab-fd3e-7b29-8a91-49fd5350e5df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_01a159ab-fd3e-77b3-aa3c-e57997930850" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_01a159ab-fd3e-7b29-8a91-49fd5350e5df" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_01a159ab-fd3e-77b3-aa3c-e57997930850" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_RainwaterCrossingSingleFamilyMember_01a15aef-dc53-7edd-ae47-62c1f6958ebf" xlink:href="grbk-20260930.xsd#grbk_RainwaterCrossingSingleFamilyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_01a159ab-fd3e-77b3-aa3c-e57997930850" xlink:to="loc_grbk_RainwaterCrossingSingleFamilyMember_01a15aef-dc53-7edd-ae47-62c1f6958ebf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_01a1599e-eeb3-75be-9788-b37f68d487cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_Cash_01a1599e-eeb3-75be-9788-b37f68d487cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_01a1599e-eeb3-708b-b11a-f914a83133c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_01a1599e-eeb3-708b-b11a-f914a83133c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_01a1599e-eeb3-7419-8cd2-eb6b14f4ad4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_NotesReceivableNet_01a1599e-eeb3-7419-8cd2-eb6b14f4ad4e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_01a1599e-eeb3-74e8-a63c-916e68768c40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_InventoryNet_01a1599e-eeb3-74e8-a63c-916e68768c40" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_01a1599e-eeb3-772e-88bf-adc0e3fb242b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_OtherAssetsCurrent_01a1599e-eeb3-772e-88bf-adc0e3fb242b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_01a1599e-eeb3-7e6f-8fd7-288e04254dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a1599f-c2c8-7c26-aa7d-2c24340b485b" xlink:to="loc_us-gaap_Assets_01a1599e-eeb3-7e6f-8fd7-288e04254dd2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_01a1599e-eeb3-7d17-8586-d55dc5333fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:to="loc_us-gaap_AccountsPayableCurrent_01a1599e-eeb3-7d17-8586-d55dc5333fcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_01a1599e-eeb3-7cde-bb87-d92e6bddf85d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_01a1599e-eeb3-7cde-bb87-d92e6bddf85d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_01a1599e-eeb3-74d2-88df-5df3ed0e0b73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:to="loc_us-gaap_NotesPayableCurrent_01a1599e-eeb3-74d2-88df-5df3ed0e0b73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_01a1599e-eeb3-7c78-b05e-cfd9bbaa91aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a159a2-5885-7690-ade7-a3b8178af573" xlink:to="loc_us-gaap_Liabilities_01a1599e-eeb3-7c78-b05e-cfd9bbaa91aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_01a159a4-5e86-7dff-870d-c35facf02f21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_EquityAbstract_01a159a4-5e86-7dff-870d-c35facf02f21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_01a1599e-eeb3-7f1f-a040-a13473747bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_01a159a4-5e86-7dff-870d-c35facf02f21" xlink:to="loc_us-gaap_StockholdersEquity_01a1599e-eeb3-7f1f-a040-a13473747bbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_01a1599e-eeb3-77db-97a8-231332e3404b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_01a159a4-5e86-7dff-870d-c35facf02f21" xlink:to="loc_us-gaap_MinorityInterest_01a1599e-eeb3-77db-97a8-231332e3404b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a1599e-eeb3-782c-88b2-7db0b8ee3642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_01a159a4-5e86-7dff-870d-c35facf02f21" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a1599e-eeb3-782c-88b2-7db0b8ee3642" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_01a1599e-eeb3-7dda-adb6-11db3a290179" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_01a1599e-eeb3-7dda-adb6-11db3a290179" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_01a159ab-5901-78f1-aa8c-8996e6ddb3a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_01a159ab-5901-78f1-aa8c-8996e6ddb3a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_01a159b1-58f7-7d5c-962a-45a2cde1a81b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_Revenues_01a159b1-58f7-7d5c-962a-45a2cde1a81b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_01a159b1-58f7-760e-928a-be7c4c1dc61a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_CostsAndExpenses_01a159b1-58f7-760e-928a-be7c4c1dc61a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_01a159b1-58f7-7625-bd4c-c12edaf71f32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_ProfitLoss_01a159b1-58f7-7625-bd4c-c12edaf71f32" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_01a159b1-58f7-7ae6-9f91-cc50aa85ef94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_01a1599e-eeb3-7e15-9bdb-7d9900bb1891" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_01a159b1-58f7-7ae6-9f91-cc50aa85ef94" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/DebtScheduleofLinesofCreditOutstandingDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#DebtScheduleofLinesofCreditOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/DebtScheduleofLinesofCreditOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_01a159e6-bb89-7f49-b57c-bf9dd85c9046" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019fb4cf-9359-7a98-b94e-725d808a925b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159e6-bb89-7f49-b57c-bf9dd85c9046" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019fb4cf-9359-7a98-b94e-725d808a925b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a159e7-80fd-7466-b5a5-4d08948ed78e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019fb4cf-9359-7a98-b94e-725d808a925b" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a159e7-80fd-7466-b5a5-4d08948ed78e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-7466-b5a5-4d08948ed78e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159e7-80fd-7466-b5a5-4d08948ed78e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-7466-b5a5-4d08948ed78e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-732c-a5ee-9fabc002bfa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159e7-80fd-7466-b5a5-4d08948ed78e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-732c-a5ee-9fabc002bfa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_SecuredRevolvingCreditFacilityMember_01a159e7-80fd-7a3f-8bc7-79208b85bd7a" xlink:href="grbk-20260930.xsd#grbk_SecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-732c-a5ee-9fabc002bfa6" xlink:to="loc_grbk_SecuredRevolvingCreditFacilityMember_01a159e7-80fd-7a3f-8bc7-79208b85bd7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_UnsecuredRevolvingCreditFacilityMember_01a159e7-80fd-755e-abb7-663f43e9b0d7" xlink:href="grbk-20260930.xsd#grbk_UnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-732c-a5ee-9fabc002bfa6" xlink:to="loc_grbk_UnsecuredRevolvingCreditFacilityMember_01a159e7-80fd-755e-abb7-663f43e9b0d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a159e7-80fd-72fb-a285-140b48c25926" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarehouseAgreementBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159e7-80fd-732c-a5ee-9fabc002bfa6" xlink:to="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a159e7-80fd-72fb-a285-140b48c25926" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a159e7-80fd-7d9f-8f48-76011c6f428e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019fb4cf-9359-7a98-b94e-725d808a925b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a159e7-80fd-7d9f-8f48-76011c6f428e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159e7-80fd-7d9f-8f48-76011c6f428e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159e7-80fd-7d9f-8f48-76011c6f428e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159e7-80fd-7d9f-8f48-76011c6f428e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159e7-80fd-7b01-877b-06ac7ab11b51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159e7-80fd-7d9f-8f48-76011c6f428e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159e7-80fd-7b01-877b-06ac7ab11b51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159e7-80fd-78fc-8b35-49aa7bccaa03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a159e7-80fd-7b01-877b-06ac7ab11b51" xlink:to="loc_us-gaap_LineOfCreditMember_01a159e7-80fd-78fc-8b35-49aa7bccaa03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a159ee-c555-7703-b2f0-fad09b5e804c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019fb4cf-9359-7a98-b94e-725d808a925b" xlink:to="loc_us-gaap_CreditFacilityAxis_01a159ee-c555-7703-b2f0-fad09b5e804c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ee-c555-7703-b2f0-fad09b5e804c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ee-c555-7703-b2f0-fad09b5e804c" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ee-c555-7703-b2f0-fad09b5e804c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ee-c555-7773-8812-970a8eb2d83d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ee-c555-7703-b2f0-fad09b5e804c" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ee-c555-7773-8812-970a8eb2d83d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159ee-e1a3-714c-a9f1-521cf4162c81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a159ee-c555-7773-8812-970a8eb2d83d" xlink:to="loc_us-gaap_LineOfCreditMember_01a159ee-e1a3-714c-a9f1-521cf4162c81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_01a159e6-bb89-701e-81e1-6fa33f22cca9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159e6-bb89-7f49-b57c-bf9dd85c9046" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_01a159e6-bb89-701e-81e1-6fa33f22cca9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_01a159e6-bb89-7592-a7ba-2743f2a568bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159e6-bb89-7f49-b57c-bf9dd85c9046" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_01a159e6-bb89-7592-a7ba-2743f2a568bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a159e6-bb89-76b1-9302-5ed0b73b71f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159e6-bb89-7f49-b57c-bf9dd85c9046" xlink:to="loc_us-gaap_LongTermDebt_01a159e6-bb89-76b1-9302-5ed0b73b71f3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a159ea-7f6d-7b7b-a490-0909a4f02247" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:to="loc_us-gaap_CreditFacilityAxis_01a159ea-7f6d-7b7b-a490-0909a4f02247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-7b7b-a490-0909a4f02247_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ea-7f6d-7b7b-a490-0909a4f02247" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-7b7b-a490-0909a4f02247_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-79d9-b87f-49b14c4bdb45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ea-7f6d-7b7b-a490-0909a4f02247" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-79d9-b87f-49b14c4bdb45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_01a159ea-7f6d-74e8-978b-cb7da4f0f9d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-79d9-b87f-49b14c4bdb45" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_01a159ea-7f6d-74e8-978b-cb7da4f0f9d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159f0-fe8b-789f-8fe2-459efda680d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a159ea-7f6d-79d9-b87f-49b14c4bdb45" xlink:to="loc_us-gaap_LineOfCreditMember_01a159f0-fe8b-789f-8fe2-459efda680d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a159ea-7f6d-763a-aa79-acf959eb5f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a159ea-7f6d-763a-aa79-acf959eb5f9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-763a-aa79-acf959eb5f9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159ea-7f6d-763a-aa79-acf959eb5f9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-763a-aa79-acf959eb5f9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159ea-7f6d-763a-aa79-acf959eb5f9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_SecuredRevolvingCreditFacilityMember_01a159ea-7f6d-7931-b443-cb65c535fd08" xlink:href="grbk-20260930.xsd#grbk_SecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_grbk_SecuredRevolvingCreditFacilityMember_01a159ea-7f6d-7931-b443-cb65c535fd08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_UnsecuredRevolvingCreditFacilityMember_01a159ea-7f6d-74e2-81b5-3362c0c0ab60" xlink:href="grbk-20260930.xsd#grbk_UnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_grbk_UnsecuredRevolvingCreditFacilityMember_01a159ea-7f6d-74e2-81b5-3362c0c0ab60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a159f3-a5e5-7b29-8184-9e7f61cb2d31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarehouseAgreementBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a159f3-a5e5-7b29-8184-9e7f61cb2d31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2026NotesMember_01a159fb-7bdb-70f2-b1c1-9285dce5fe6b" xlink:href="grbk-20260930.xsd#grbk_A2026NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_grbk_A2026NotesMember_01a159fb-7bdb-70f2-b1c1-9285dce5fe6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2028NotesMember_01a15a00-8eb0-7d3d-a857-596e1b0f2e2e" xlink:href="grbk-20260930.xsd#grbk_A2028NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_grbk_A2028NotesMember_01a15a00-8eb0-7d3d-a857-596e1b0f2e2e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2029NotesMember_01a15a01-02eb-702d-af0c-1aa6f2ef0aa2" xlink:href="grbk-20260930.xsd#grbk_A2029NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ea-7f6d-7bfa-8edf-fbe36b376ef7" xlink:to="loc_grbk_A2029NotesMember_01a15a01-02eb-702d-af0c-1aa6f2ef0aa2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a159ea-7f6d-7cf0-9174-df731f483b26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a159ea-7f6d-7cf0-9174-df731f483b26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-7cf0-9174-df731f483b26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159ea-7f6d-7cf0-9174-df731f483b26" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-7cf0-9174-df731f483b26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-760c-be23-e97f4e163cdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159ea-7f6d-7cf0-9174-df731f483b26" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-760c-be23-e97f4e163cdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159ea-7f6d-72c2-a00d-1bd29a54b366" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-760c-be23-e97f4e163cdf" xlink:to="loc_us-gaap_LineOfCreditMember_01a159ea-7f6d-72c2-a00d-1bd29a54b366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_01a159fb-c249-77c7-9025-8e5997dd5175" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a159ea-7f6d-760c-be23-e97f4e163cdf" xlink:to="loc_us-gaap_SeniorNotesMember_01a159fb-c249-77c7-9025-8e5997dd5175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a159f2-65db-7f39-8fba-d2ad9d073bae" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:to="loc_srt_RangeAxis_01a159f2-65db-7f39-8fba-d2ad9d073bae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a159f2-65db-7f39-8fba-d2ad9d073bae_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a159f2-65db-7f39-8fba-d2ad9d073bae" xlink:to="loc_srt_RangeMember_01a159f2-65db-7f39-8fba-d2ad9d073bae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a159f2-65db-724d-a335-6763c8313518" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a159f2-65db-7f39-8fba-d2ad9d073bae" xlink:to="loc_srt_RangeMember_01a159f2-65db-724d-a335-6763c8313518" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a159f3-bf02-7452-9248-d70a3ff9c449" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a159f2-65db-724d-a335-6763c8313518" xlink:to="loc_srt_MinimumMember_01a159f3-bf02-7452-9248-d70a3ff9c449" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a159f3-d8d6-7de7-a3e7-66f01f480838" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a159f2-65db-724d-a335-6763c8313518" xlink:to="loc_srt_MaximumMember_01a159f3-d8d6-7de7-a3e7-66f01f480838" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_01a15a01-c94e-7073-9d5b-2209049e8b55" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159ea-7f6d-779e-a320-ceb216b77361" xlink:to="loc_srt_StatementScenarioAxis_01a15a01-c94e-7073-9d5b-2209049e8b55" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_01a15a01-c94e-7073-9d5b-2209049e8b55_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_01a15a01-c94e-7073-9d5b-2209049e8b55" xlink:to="loc_srt_ScenarioUnspecifiedDomain_01a15a01-c94e-7073-9d5b-2209049e8b55_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_01a15a01-c94e-7534-922e-6ba6a98824e4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_01a15a01-c94e-7073-9d5b-2209049e8b55" xlink:to="loc_srt_ScenarioUnspecifiedDomain_01a15a01-c94e-7534-922e-6ba6a98824e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_01a15a01-dfdc-7cb8-94ab-0f3627e7a1ad" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_01a15a01-c94e-7534-922e-6ba6a98824e4" xlink:to="loc_srt_ScenarioForecastMember_01a15a01-dfdc-7cb8-94ab-0f3627e7a1ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a159ea-7f6d-79e0-874d-1f7098f9e826" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a159ea-7f6d-79e0-874d-1f7098f9e826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_01a159f2-461f-7ed8-bf14-5ac6b5a19738" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_01a159f2-461f-7ed8-bf14-5ac6b5a19738" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_DebtInstrumentParticipationInterestRemainderOfPrincipalPercentage_01a159f6-8c44-7f97-98a6-cf18daf7c8f8" xlink:href="grbk-20260930.xsd#grbk_DebtInstrumentParticipationInterestRemainderOfPrincipalPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_grbk_DebtInstrumentParticipationInterestRemainderOfPrincipalPercentage_01a159f6-8c44-7f97-98a6-cf18daf7c8f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_DebtInstrumentSoldTerm_01a159f7-f189-7ba9-9b22-d110b0302517" xlink:href="grbk-20260930.xsd#grbk_DebtInstrumentSoldTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_grbk_DebtInstrumentSoldTerm_01a159f7-f189-7ba9-9b22-d110b0302517" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_01a159fb-3b1a-7635-b295-9afef9948980" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_01a159fb-3b1a-7635-b295-9afef9948980" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_01a159ff-74e4-7408-a7ae-0cbf0beb0089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159ea-7f6d-74fe-9e92-a4e3ab3bc47e" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_01a159ff-74e4-7408-a7ae-0cbf0beb0089" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/DebtSummaryofWarehouseFacilitiesDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#DebtSummaryofWarehouseFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/DebtSummaryofWarehouseFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_01a159ef-c36e-7fa3-beb1-e794193234ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_01a159ef-c36e-7dd1-b828-27b604f4ba52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159ef-c36e-7fa3-beb1-e794193234ff" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_01a159ef-c36e-7dd1-b828-27b604f4ba52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a159ef-c36e-78e9-897f-f96f5eb38683" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a159ef-c36e-7dd1-b828-27b604f4ba52" xlink:to="loc_us-gaap_CreditFacilityAxis_01a159ef-c36e-78e9-897f-f96f5eb38683" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ef-c36e-78e9-897f-f96f5eb38683_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ef-c36e-78e9-897f-f96f5eb38683" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ef-c36e-78e9-897f-f96f5eb38683_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a159ef-c36e-7046-bc40-328fd5e31c8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a159ef-c36e-78e9-897f-f96f5eb38683" xlink:to="loc_us-gaap_CreditFacilityDomain_01a159ef-c36e-7046-bc40-328fd5e31c8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159ef-c36e-77ce-a402-823166ab33ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a159ef-c36e-7046-bc40-328fd5e31c8c" xlink:to="loc_us-gaap_LineOfCreditMember_01a159ef-c36e-77ce-a402-823166ab33ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a159ef-c36e-71c4-af72-282a1e22bf03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a159ef-c36e-7dd1-b828-27b604f4ba52" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a159ef-c36e-71c4-af72-282a1e22bf03" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-71c4-af72-282a1e22bf03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159ef-c36e-71c4-af72-282a1e22bf03" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-71c4-af72-282a1e22bf03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-706e-b7dc-8c7799a4f2e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159ef-c36e-71c4-af72-282a1e22bf03" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-706e-b7dc-8c7799a4f2e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_WarehouseFacilityExpiringJanuary292027Member_01a159ef-c36e-74b9-abb6-06f495e32f1b" xlink:href="grbk-20260930.xsd#grbk_WarehouseFacilityExpiringJanuary292027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-706e-b7dc-8c7799a4f2e0" xlink:to="loc_grbk_WarehouseFacilityExpiringJanuary292027Member_01a159ef-c36e-74b9-abb6-06f495e32f1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_WarehouseFacilityExpiringJanuary312027Member_01a159ef-c36e-74a8-b33e-cb84e018c086" xlink:href="grbk-20260930.xsd#grbk_WarehouseFacilityExpiringJanuary312027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-706e-b7dc-8c7799a4f2e0" xlink:to="loc_grbk_WarehouseFacilityExpiringJanuary312027Member_01a159ef-c36e-74a8-b33e-cb84e018c086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_WarehouseFacilityExpiringDecember152027Member_01a159ef-c36e-7695-85c8-1e356808afdc" xlink:href="grbk-20260930.xsd#grbk_WarehouseFacilityExpiringDecember152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159ef-c36e-706e-b7dc-8c7799a4f2e0" xlink:to="loc_grbk_WarehouseFacilityExpiringDecember152027Member_01a159ef-c36e-7695-85c8-1e356808afdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a159ef-c36e-7286-91d6-a4eeafd73213" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_01a159ef-c36e-7dd1-b828-27b604f4ba52" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a159ef-c36e-7286-91d6-a4eeafd73213" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159ef-c36e-7286-91d6-a4eeafd73213_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159ef-c36e-7286-91d6-a4eeafd73213" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159ef-c36e-7286-91d6-a4eeafd73213_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159ef-c36e-796b-9052-8bdc34404390" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159ef-c36e-7286-91d6-a4eeafd73213" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159ef-c36e-796b-9052-8bdc34404390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a159ef-c36e-7e3c-ae4c-3ba66af13382" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a159ef-c36e-796b-9052-8bdc34404390" xlink:to="loc_us-gaap_LineOfCreditMember_01a159ef-c36e-7e3c-ae4c-3ba66af13382" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a159ef-c36e-7ed8-89f0-d77e0c248278" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159ef-c36e-7fa3-beb1-e794193234ff" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_01a159ef-c36e-7ed8-89f0-d77e0c248278" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarehouseAgreementBorrowings_01a159ef-c36e-748a-a7dd-08b0be714634" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarehouseAgreementBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01a159ef-c36e-7fa3-beb1-e794193234ff" xlink:to="loc_us-gaap_WarehouseAgreementBorrowings_01a159ef-c36e-748a-a7dd-08b0be714634" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/DebtScheduleofSeniorUnsecuredNotesDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#DebtScheduleofSeniorUnsecuredNotesDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/DebtScheduleofSeniorUnsecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a159fa-770e-7a98-bffe-8b837d71e4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:to="loc_us-gaap_DebtInstrumentTable_01a159fa-770e-7a98-bffe-8b837d71e4ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a159fa-770e-79ff-b472-fdd1fb7c8e50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159fa-770e-7a98-bffe-8b837d71e4ee" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a159fa-770e-79ff-b472-fdd1fb7c8e50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-79ff-b472-fdd1fb7c8e50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159fa-770e-79ff-b472-fdd1fb7c8e50" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-79ff-b472-fdd1fb7c8e50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a159fa-770e-79ff-b472-fdd1fb7c8e50" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2026NotesMember_01a159fa-770e-7bd4-b797-7632fda1566c" xlink:href="grbk-20260930.xsd#grbk_A2026NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:to="loc_grbk_A2026NotesMember_01a159fa-770e-7bd4-b797-7632fda1566c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2027NotesMember_01a159fa-770e-7369-9185-e7d2bcb31997" xlink:href="grbk-20260930.xsd#grbk_A2027NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:to="loc_grbk_A2027NotesMember_01a159fa-770e-7369-9185-e7d2bcb31997" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2028NotesMember_01a159fa-770e-7161-8383-20d2727473cc" xlink:href="grbk-20260930.xsd#grbk_A2028NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:to="loc_grbk_A2028NotesMember_01a159fa-770e-7161-8383-20d2727473cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_A2029NotesMember_01a159fa-770e-7c8f-a20a-a88fc831c60d" xlink:href="grbk-20260930.xsd#grbk_A2029NotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a159fa-770e-7b99-8e7f-a41c3aa706d1" xlink:to="loc_grbk_A2029NotesMember_01a159fa-770e-7c8f-a20a-a88fc831c60d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a159fa-770e-7df8-abe0-a45a32a5e8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a159fa-770e-7a98-bffe-8b837d71e4ee" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a159fa-770e-7df8-abe0-a45a32a5e8cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159fa-770e-7df8-abe0-a45a32a5e8cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159fa-770e-7df8-abe0-a45a32a5e8cb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159fa-770e-7df8-abe0-a45a32a5e8cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a159fa-770e-799b-8737-3cb06037ce9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a159fa-770e-7df8-abe0-a45a32a5e8cb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a159fa-770e-799b-8737-3cb06037ce9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_01a159fa-770e-7011-b227-349070c21c0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a159fa-770e-799b-8737-3cb06037ce9e" xlink:to="loc_us-gaap_SeniorNotesMember_01a159fa-770e-7011-b227-349070c21c0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_01a159fa-770e-7ffc-80a3-91ba03d27465" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_01a159fa-770e-7ffc-80a3-91ba03d27465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_01a159fa-770e-7eb9-8616-ae01b0020fc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_01a159fa-770e-7eb9-8616-ae01b0020fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a159fa-770e-7703-8b32-ba5f2c0b1b40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:to="loc_us-gaap_LongTermDebt_01a159fa-770e-7703-8b32-ba5f2c0b1b40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a16505-f369-7867-8bda-c9037927bb7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a159fa-770e-7f38-a7f8-1575b986858e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a16505-f369-7867-8bda-c9037927bb7b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RedeemableNoncontrollingInterestNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#RedeemableNoncontrollingInterestNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RedeemableNoncontrollingInterestNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestLineItems_01a15ae5-52a5-764b-b075-4f3a8d7cbbd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable_01a15ae5-52a5-7537-b6e5-5c9d5935a4f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RedeemableNoncontrollingInterestLineItems_01a15ae5-52a5-764b-b075-4f3a8d7cbbd6" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable_01a15ae5-52a5-7537-b6e5-5c9d5935a4f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_01a15ae5-52a5-7aff-b5ad-bce98f66182a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RedeemableNoncontrollingInterestByLegalEntityTable_01a15ae5-52a5-7537-b6e5-5c9d5935a4f9" xlink:to="loc_srt_OwnershipAxis_01a15ae5-52a5-7aff-b5ad-bce98f66182a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a15ae5-52a5-7aff-b5ad-bce98f66182a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_01a15ae5-52a5-7aff-b5ad-bce98f66182a" xlink:to="loc_srt_OwnershipDomain_01a15ae5-52a5-7aff-b5ad-bce98f66182a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a15ae5-52a5-7691-9b56-34a16f75d11e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_01a15ae5-52a5-7aff-b5ad-bce98f66182a" xlink:to="loc_srt_OwnershipDomain_01a15ae5-52a5-7691-9b56-34a16f75d11e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_GHOHomesMember_01a15ae5-52a5-7638-9d03-4cfeb9630e3b" xlink:href="grbk-20260930.xsd#grbk_GHOHomesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_01a15ae5-52a5-7691-9b56-34a16f75d11e" xlink:to="loc_grbk_GHOHomesMember_01a15ae5-52a5-7638-9d03-4cfeb9630e3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_01a15ae5-52a5-7927-bd85-83da724ccb8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RedeemableNoncontrollingInterestLineItems_01a15ae5-52a5-764b-b075-4f3a8d7cbbd6" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_01a15ae5-52a5-7927-bd85-83da724ccb8d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_01a15b02-a1c9-7573-a630-b3ce49223c53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_SubsequentEventTable_01a15b02-a1c9-7573-a630-b3ce49223c53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_01a15b02-a1c9-74b7-8b04-e65d7d0df447" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_01a15b02-a1c9-7573-a630-b3ce49223c53" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_01a15b02-a1c9-74b7-8b04-e65d7d0df447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a15b02-a1c9-74b7-8b04-e65d7d0df447_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a15b02-a1c9-74b7-8b04-e65d7d0df447" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a15b02-a1c9-74b7-8b04-e65d7d0df447_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_01a15b02-a1c9-72b1-a6ff-aba43b572452" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_01a15b02-a1c9-74b7-8b04-e65d7d0df447" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_01a15b02-a1c9-72b1-a6ff-aba43b572452" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_01a15b02-a1c9-712f-9613-6350facb646e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_01a15b02-a1c9-72b1-a6ff-aba43b572452" xlink:to="loc_us-gaap_SubsequentEventMember_01a15b02-a1c9-712f-9613-6350facb646e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_01a15adc-e870-78b5-a8c7-118bcd9b6c43" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_01a15adc-e870-78b5-a8c7-118bcd9b6c43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_01a15adc-e870-7cb7-9d95-2c584620e32f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_01a15adc-e870-7cb7-9d95-2c584620e32f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a15adc-e870-7dcf-bf3e-5959154b1d74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_01a15adc-e870-7dcf-bf3e-5959154b1d74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_StockRepurchasedDuringPeriodExcludingExciseTaxValue_01a15adc-e870-793f-b6f8-a5b6679d95a3" xlink:href="grbk-20260930.xsd#grbk_StockRepurchasedDuringPeriodExcludingExciseTaxValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_grbk_StockRepurchasedDuringPeriodExcludingExciseTaxValue_01a15adc-e870-793f-b6f8-a5b6679d95a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_01a15adc-e870-7837-b552-d82a46334e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_01a15adc-e870-7837-b552-d82a46334e6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_01a15ade-f092-7479-afad-0392908a4a95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_DividendsCash_01a15ade-f092-7479-afad-0392908a4a95" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_01a15ade-f092-73e5-b101-c8fa6e85013a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_01a15b02-a1c9-70d6-aad7-11bee560ec3a" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_01a15ade-f092-73e5-b101-c8fa6e85013a" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#ShareBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a15b08-eb80-7f51-adc0-8bd8d6211708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a15b08-eb80-7f51-adc0-8bd8d6211708" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_01a15b08-eb80-7aa2-9b8a-3285a563aa05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_01a15b08-eb80-7f51-adc0-8bd8d6211708" xlink:to="loc_us-gaap_GranteeStatusAxis_01a15b08-eb80-7aa2-9b8a-3285a563aa05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-7aa2-9b8a-3285a563aa05_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_01a15b08-eb80-7aa2-9b8a-3285a563aa05" xlink:to="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-7aa2-9b8a-3285a563aa05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-715a-89cf-4ff850872d61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_01a15b08-eb80-7aa2-9b8a-3285a563aa05" xlink:to="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-715a-89cf-4ff850872d61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_01a15b08-eb80-776a-b3c1-ce78043dc844" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedPaymentArrangementNonemployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-715a-89cf-4ff850872d61" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_01a15b08-eb80-776a-b3c1-ce78043dc844" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_01a15b08-eb80-7e25-bb97-2fad99a3ecf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_01a15b08-eb80-715a-89cf-4ff850872d61" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_01a15b08-eb80-7e25-bb97-2fad99a3ecf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_01a15b08-eb80-7301-aca0-9471ff32b2b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_01a15b08-eb80-7301-aca0-9471ff32b2b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_01a15b08-eb80-7ba3-9d20-f9db1ea3e047" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_01a15b08-eb80-7ba3-9d20-f9db1ea3e047" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_01a15a97-6fb6-7524-b4dd-ee186abef88f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_01a15a97-6fb6-7524-b4dd-ee186abef88f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_01a15a97-6fb6-7ab2-9b0d-c14ec233f2c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_01a15a97-6fb6-7ab2-9b0d-c14ec233f2c4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_01a15a98-9996-7a71-9e07-b60f5793a86c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_01a15a98-9996-7a71-9e07-b60f5793a86c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_01a15a98-9996-7aab-bd27-1581f61867cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_01a15a98-9996-7aab-bd27-1581f61867cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_01a15a98-9996-7217-9bbd-3feb322a3899" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_01a15b08-eb80-7691-a339-52c877b23404" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_01a15a98-9996-7217-9bbd-3feb322a3899" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RevenueRecognitionContractBalancesDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#RevenueRecognitionContractBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RevenueRecognitionContractBalancesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-146e-7aff-b63e-2862e1666a09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-146e-7d55-8ad4-0e01abef6982" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-146e-7aff-b63e-2862e1666a09" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-146e-7d55-8ad4-0e01abef6982" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_01a15a7e-146e-7b9d-a2d1-99335f3e324e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-146e-7d55-8ad4-0e01abef6982" xlink:to="loc_srt_MajorCustomersAxis_01a15a7e-146e-7b9d-a2d1-99335f3e324e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-7b9d-a2d1-99335f3e324e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_01a15a7e-146e-7b9d-a2d1-99335f3e324e" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-7b9d-a2d1-99335f3e324e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-72ad-aca1-e49939053571" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_01a15a7e-146e-7b9d-a2d1-99335f3e324e" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-72ad-aca1-e49939053571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_HomebuyersMember_01a15a7e-146e-7c5c-bf8f-c9cf67388f81" xlink:href="grbk-20260930.xsd#grbk_HomebuyersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-72ad-aca1-e49939053571" xlink:to="loc_grbk_HomebuyersMember_01a15a7e-146e-7c5c-bf8f-c9cf67388f81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_HomebuildersMember_01a15a7e-146e-7f32-bee5-5b49083b3ac4" xlink:href="grbk-20260930.xsd#grbk_HomebuildersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a15a7e-146e-72ad-aca1-e49939053571" xlink:to="loc_grbk_HomebuildersMember_01a15a7e-146e-7f32-bee5-5b49083b3ac4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_01a15a7c-b444-7517-8bd6-ca723c99c297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-146e-7aff-b63e-2862e1666a09" xlink:to="loc_us-gaap_ContractWithCustomerLiability_01a15a7c-b444-7517-8bd6-ca723c99c297" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a15a7e-146e-7c3b-9d22-f7545ed6306c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-146e-7aff-b63e-2862e1666a09" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_01a15a7e-146e-7c3b-9d22-f7545ed6306c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a15a7b-2f4e-7ad7-8cf1-0a1ae5107a22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a15a7b-2f4e-7ad7-8cf1-0a1ae5107a22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_01a15a7b-2f4e-7b53-bf17-43dfbb3d0728" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a15a7b-2f4e-7ad7-8cf1-0a1ae5107a22" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_01a15a7b-2f4e-7b53-bf17-43dfbb3d0728" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_01a15a7b-2f4e-7a30-af13-cc008c0b4061" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_ContractWithCustomerLiability_01a15a7b-2f4e-7a30-af13-cc008c0b4061" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_01a15a7c-159d-7306-941f-bbce2e965a27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_01a15a7c-159d-7306-941f-bbce2e965a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a15a7c-400a-7cf5-85cf-6cd584fc7829" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a15a7c-400a-7cf5-85cf-6cd584fc7829" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="simple" xlink:href="grbk-20260930.xsd#RevenueRecognitionNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a15a7b-2f4e-7ad7-8cf1-0a1ae5107a22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_01a15a7b-2f4e-7ad7-8cf1-0a1ae5107a22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_01a15a7b-2f4e-7a30-af13-cc008c0b4061" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_ContractWithCustomerLiability_01a15a7b-2f4e-7a30-af13-cc008c0b4061" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_01a15a7c-159d-7306-941f-bbce2e965a27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_01a15a7c-159d-7306-941f-bbce2e965a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a15a7c-400a-7cf5-85cf-6cd584fc7829" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_01a15a7b-2f4e-7cfb-989f-5f13c2c05a99" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_01a15a7c-400a-7cf5-85cf-6cd584fc7829" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-ef22-720e-86d1-4c755c83f0da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-ef22-720e-86d1-4c755c83f0da" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a15a7e-ef22-72db-9d16-1016791bb768" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:to="loc_srt_ProductOrServiceAxis_01a15a7e-ef22-72db-9d16-1016791bb768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-72db-9d16-1016791bb768_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a15a7e-ef22-72db-9d16-1016791bb768" xlink:to="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-72db-9d16-1016791bb768_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-7b6f-b683-cc331a18d402" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a15a7e-ef22-72db-9d16-1016791bb768" xlink:to="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-7b6f-b683-cc331a18d402" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_01a15a7e-ef22-7492-b04f-f5e0ed04ceb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-7b6f-b683-cc331a18d402" xlink:to="loc_us-gaap_ResidentialRealEstateMember_01a15a7e-ef22-7492-b04f-f5e0ed04ceb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateOtherMember_01a15a7e-ef22-7b2d-86e8-958e97f74412" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealEstateOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a15a7e-ef22-7b6f-b683-cc331a18d402" xlink:to="loc_us-gaap_RealEstateOtherMember_01a15a7e-ef22-7b2d-86e8-958e97f74412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_01a15a7e-ef22-7557-a531-be756be3cd3f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:to="loc_srt_StatementGeographicalAxis_01a15a7e-ef22-7557-a531-be756be3cd3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-7557-a531-be756be3cd3f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_01a15a7e-ef22-7557-a531-be756be3cd3f" xlink:to="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-7557-a531-be756be3cd3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-70d3-a00f-cfea1aae7ef2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_01a15a7e-ef22-7557-a531-be756be3cd3f" xlink:to="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-70d3-a00f-cfea1aae7ef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_CentralMember_01a15a7e-ef22-74c8-add4-605784e8e714" xlink:href="grbk-20260930.xsd#grbk_CentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-70d3-a00f-cfea1aae7ef2" xlink:to="loc_grbk_CentralMember_01a15a7e-ef22-74c8-add4-605784e8e714" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_SoutheastMember_01a15a7e-ef22-73cb-ba96-956792e362fb" xlink:href="grbk-20260930.xsd#grbk_SoutheastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a15a7e-ef22-70d3-a00f-cfea1aae7ef2" xlink:to="loc_grbk_SoutheastMember_01a15a7e-ef22-73cb-ba96-956792e362fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_01a15a7e-ef22-7b9a-899e-ffbc09550934" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:to="loc_srt_MajorCustomersAxis_01a15a7e-ef22-7b9a-899e-ffbc09550934" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7b9a-899e-ffbc09550934_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_01a15a7e-ef22-7b9a-899e-ffbc09550934" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7b9a-899e-ffbc09550934_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7802-b941-444a4d542c47" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_01a15a7e-ef22-7b9a-899e-ffbc09550934" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7802-b941-444a4d542c47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_HomebuyersMember_01a15a7e-ef22-79c9-92e8-1c5f4b5072d2" xlink:href="grbk-20260930.xsd#grbk_HomebuyersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7802-b941-444a4d542c47" xlink:to="loc_grbk_HomebuyersMember_01a15a7e-ef22-79c9-92e8-1c5f4b5072d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_HomebuildersMember_01a15a7e-ef22-7056-9ee1-fe949eb708e5" xlink:href="grbk-20260930.xsd#grbk_HomebuildersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a15a7e-ef22-7802-b941-444a4d542c47" xlink:to="loc_grbk_HomebuildersMember_01a15a7e-ef22-7056-9ee1-fe949eb708e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryAxis_01a15af5-08a2-74b7-b986-54139a812e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:to="loc_us-gaap_PublicUtilitiesInventoryAxis_01a15af5-08a2-74b7-b986-54139a812e5a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-74b7-b986-54139a812e5a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_01a15af5-08a2-74b7-b986-54139a812e5a" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-74b7-b986-54139a812e5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-70c6-b86c-c2780f488433" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_01a15af5-08a2-74b7-b986-54139a812e5a" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-70c6-b86c-c2780f488433" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_01a15af5-e034-770e-aa13-23a3b3f29b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-70c6-b86c-c2780f488433" xlink:to="loc_us-gaap_ResidentialRealEstateMember_01a15af5-e034-770e-aa13-23a3b3f29b2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_LandandLotsMember_01a15af6-0ef4-7e09-bd58-4b6255ee37d9" xlink:href="grbk-20260930.xsd#grbk_LandandLotsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_01a15af5-08a2-70c6-b86c-c2780f488433" xlink:to="loc_grbk_LandandLotsMember_01a15af6-0ef4-7e09-bd58-4b6255ee37d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_01a15a7e-ef22-77dc-bf56-a3197a0acec7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a15a7e-ef22-77b8-b25d-4bb308d87642" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_01a15a7e-ef22-77dc-bf56-a3197a0acec7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-77dc-bf56-a3197a0acec7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_01a15a7e-ef22-77dc-bf56-a3197a0acec7" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-77dc-bf56-a3197a0acec7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-7fb6-8f37-b94353bc9038" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_01a15a7e-ef22-77dc-bf56-a3197a0acec7" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-7fb6-8f37-b94353bc9038" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_01a15a7e-ef22-7c68-8495-7077022bbaff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-7fb6-8f37-b94353bc9038" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_01a15a7e-ef22-7c68-8495-7077022bbaff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_01a15a7e-ef22-7554-ba47-bc180437e2f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_01a15a7e-ef22-7fb6-8f37-b94353bc9038" xlink:to="loc_us-gaap_TransferredOverTimeMember_01a15a7e-ef22-7554-ba47-bc180437e2f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a15a7e-ef22-7705-a0c7-e0010f873bf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a15a7e-ef22-720e-86d1-4c755c83f0da" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a15a7e-ef22-7705-a0c7-e0010f873bf4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/SegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#SegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/SegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_01a15b0b-874d-76b4-ae6e-93090acaf13f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15b0b-874d-7833-98e9-8b2bb07b6029" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15b0b-874d-76b4-ae6e-93090acaf13f" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15b0b-874d-7833-98e9-8b2bb07b6029" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a15b0b-874d-74ab-942f-2eec700f0522" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15b0b-874d-7833-98e9-8b2bb07b6029" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a15b0b-874d-74ab-942f-2eec700f0522" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a15b0b-874d-74ab-942f-2eec700f0522_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a15b0b-874d-74ab-942f-2eec700f0522" xlink:to="loc_us-gaap_SegmentDomain_01a15b0b-874d-74ab-942f-2eec700f0522_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a15b0b-874d-7d74-9869-a5285dc781dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a15b0b-874d-74ab-942f-2eec700f0522" xlink:to="loc_us-gaap_SegmentDomain_01a15b0b-874d-7d74-9869-a5285dc781dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_LandDevelopmentMember_01a15b0b-874d-7b62-a430-e0fb825d18ae" xlink:href="grbk-20260930.xsd#grbk_LandDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a15b0b-874d-7d74-9869-a5285dc781dd" xlink:to="loc_grbk_LandDevelopmentMember_01a15b0b-874d-7b62-a430-e0fb825d18ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_01a15b0b-874d-7331-a587-8317b407ccd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15b0b-874d-76b4-ae6e-93090acaf13f" xlink:to="loc_us-gaap_NumberOfReportableSegments_01a15b0b-874d-7331-a587-8317b407ccd7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/SegmentInformationSummaryofSegmentInformationDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#SegmentInformationSummaryofSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/SegmentInformationSummaryofSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15a91-dd51-7a57-9458-f9d52813f467" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15a91-dd51-7a57-9458-f9d52813f467" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_01a15a91-dd51-7a12-8dfd-f183a774f302" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15a91-dd51-7a57-9458-f9d52813f467" xlink:to="loc_srt_ConsolidationItemsAxis_01a15a91-dd51-7a12-8dfd-f183a774f302" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-7a12-8dfd-f183a774f302_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_01a15a91-dd51-7a12-8dfd-f183a774f302" xlink:to="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-7a12-8dfd-f183a774f302_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-77eb-90f7-5122d83e878b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_01a15a91-dd51-7a12-8dfd-f183a774f302" xlink:to="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-77eb-90f7-5122d83e878b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_01a15a91-dd51-7206-8d8b-b2aeb679ecce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-77eb-90f7-5122d83e878b" xlink:to="loc_us-gaap_OperatingSegmentsMember_01a15a91-dd51-7206-8d8b-b2aeb679ecce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_01a15a91-dd51-756e-bc68-2dad0a7862ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a15a91-dd51-77eb-90f7-5122d83e878b" xlink:to="loc_us-gaap_CorporateNonSegmentMember_01a15a91-dd51-756e-bc68-2dad0a7862ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a15a91-dd51-7d6a-99a8-d234b5e46b84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15a91-dd51-7a57-9458-f9d52813f467" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a15a91-dd51-7d6a-99a8-d234b5e46b84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a15a91-dd51-7d6a-99a8-d234b5e46b84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a15a91-dd51-7d6a-99a8-d234b5e46b84" xlink:to="loc_us-gaap_SegmentDomain_01a15a91-dd51-7d6a-99a8-d234b5e46b84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a15a91-dd51-7853-b8cd-da509d47378e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a15a91-dd51-7d6a-99a8-d234b5e46b84" xlink:to="loc_us-gaap_SegmentDomain_01a15a91-dd51-7853-b8cd-da509d47378e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_BuilderOperationsMember_01a15a91-dd51-709e-8afa-b116c945ef3b" xlink:href="grbk-20260930.xsd#grbk_BuilderOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a15a91-dd51-7853-b8cd-da509d47378e" xlink:to="loc_grbk_BuilderOperationsMember_01a15a91-dd51-709e-8afa-b116c945ef3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_BuilderOperationsCentralMember_01a15a91-dd51-74a5-b4c7-5ebd4998fe94" xlink:href="grbk-20260930.xsd#grbk_BuilderOperationsCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grbk_BuilderOperationsMember_01a15a91-dd51-709e-8afa-b116c945ef3b" xlink:to="loc_grbk_BuilderOperationsCentralMember_01a15a91-dd51-74a5-b4c7-5ebd4998fe94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_BuilderOperationsSoutheastMember_01a15a91-dd51-7565-8483-b5e318de98a8" xlink:href="grbk-20260930.xsd#grbk_BuilderOperationsSoutheastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_grbk_BuilderOperationsMember_01a15a91-dd51-709e-8afa-b116c945ef3b" xlink:to="loc_grbk_BuilderOperationsSoutheastMember_01a15a91-dd51-7565-8483-b5e318de98a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_LandDevelopmentMember_01a15a91-dd51-7488-8447-9f10fb984527" xlink:href="grbk-20260930.xsd#grbk_LandDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a15a91-dd51-7853-b8cd-da509d47378e" xlink:to="loc_grbk_LandDevelopmentMember_01a15a91-dd51-7488-8447-9f10fb984527" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_FinancialServicesMember_01a15a91-dd51-7226-bdc1-d280157be14d" xlink:href="grbk-20260930.xsd#grbk_FinancialServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a15a91-dd51-7853-b8cd-da509d47378e" xlink:to="loc_grbk_FinancialServicesMember_01a15a91-dd51-7226-bdc1-d280157be14d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a15af0-21b3-7f17-a49a-385be2b2c2cc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a15a91-dd51-7a57-9458-f9d52813f467" xlink:to="loc_srt_ProductOrServiceAxis_01a15af0-21b3-7f17-a49a-385be2b2c2cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a15af0-21b3-7f17-a49a-385be2b2c2cc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a15af0-21b3-7f17-a49a-385be2b2c2cc" xlink:to="loc_srt_ProductsAndServicesDomain_01a15af0-21b3-7f17-a49a-385be2b2c2cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a15af0-21b3-72c8-a826-b3467682993b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a15af0-21b3-7f17-a49a-385be2b2c2cc" xlink:to="loc_srt_ProductsAndServicesDomain_01a15af0-21b3-72c8-a826-b3467682993b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_LandandLotsMember_01a15af0-21b3-7f44-9c49-7519ec0cd029" xlink:href="grbk-20260930.xsd#grbk_LandandLotsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a15af0-21b3-72c8-a826-b3467682993b" xlink:to="loc_grbk_LandandLotsMember_01a15af0-21b3-7f44-9c49-7519ec0cd029" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a15a91-dd51-753f-a1de-59fe19cd68e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a15a91-dd51-753f-a1de-59fe19cd68e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_FinancialServicesRevenue_01a168d8-6f19-78d4-8a0b-b940f8484686" xlink:href="grbk-20260930.xsd#grbk_FinancialServicesRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_grbk_FinancialServicesRevenue_01a168d8-6f19-78d4-8a0b-b940f8484686" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_01a168d8-c88a-76a7-bc80-2eb47ef75069" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_Revenues_01a168d8-c88a-76a7-bc80-2eb47ef75069" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_01a15a91-dd51-73d5-9987-7ecceb2adc5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_GrossProfit_01a15a91-dd51-73d5-9987-7ecceb2adc5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesCommissionsAndFees_01a15a91-dd51-72be-8391-a1e20241b337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_SalesCommissionsAndFees_01a15a91-dd51-72be-8391-a1e20241b337" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_01a15a91-dd51-7a1a-a4df-bb1093340ec6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_CompensationExpenseExcludingCostOfGoodAndServiceSold_01a15a91-dd51-7a1a-a4df-bb1093340ec6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_01a15a91-dd51-746d-bb3d-8ae003698b55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_InterestExpenseOperating_01a15a91-dd51-746d-bb3d-8ae003698b55" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSellingGeneralAndAdministrativeExpense_01a15a91-dd51-7902-8185-c05d820d0fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_OtherSellingGeneralAndAdministrativeExpense_01a15a91-dd51-7902-8185-c05d820d0fb6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_AdjustedSellingGeneralAndAdministrativeExpenses_01a15a91-dd51-7b99-8120-67a89e05fdf6" xlink:href="grbk-20260930.xsd#grbk_AdjustedSellingGeneralAndAdministrativeExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_grbk_AdjustedSellingGeneralAndAdministrativeExpenses_01a15a91-dd51-7b99-8120-67a89e05fdf6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a15a91-dd51-7e0a-831c-995057de3700" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a15a91-dd51-7e0a-831c-995057de3700" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryOperativeBuilders_01a15a94-2784-7428-928e-4d21f307d958" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryOperativeBuilders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_InventoryOperativeBuilders_01a15a94-2784-7428-928e-4d21f307d958" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a15a94-2784-784e-8b31-c0650389aa30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a15a91-dd51-73b5-acb9-1d954692a252" xlink:to="loc_us-gaap_Goodwill_01a15a94-2784-784e-8b31-c0650389aa30" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/MortgageLoansHeldforSaleNarrativeDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#MortgageLoansHeldforSaleNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/MortgageLoansHeldforSaleNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_01a15a62-820a-7bf3-b88d-98a38166474b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:to="loc_us-gaap_DerivativeTable_01a15a62-820a-7bf3-b88d-98a38166474b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_01a15a62-820a-78b8-82b9-7e2d32c5d2e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_01a15a62-820a-7bf3-b88d-98a38166474b" xlink:to="loc_us-gaap_CreditFacilityAxis_01a15a62-820a-78b8-82b9-7e2d32c5d2e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a15a62-820a-78b8-82b9-7e2d32c5d2e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_01a15a62-820a-78b8-82b9-7e2d32c5d2e5" xlink:to="loc_us-gaap_CreditFacilityDomain_01a15a62-820a-78b8-82b9-7e2d32c5d2e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_01a15a62-820a-71f6-9124-32179d9c0aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_01a15a62-820a-78b8-82b9-7e2d32c5d2e5" xlink:to="loc_us-gaap_CreditFacilityDomain_01a15a62-820a-71f6-9124-32179d9c0aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a15a62-820a-7bf1-9adc-cbf7cbcea3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_01a15a62-820a-71f6-9124-32179d9c0aa9" xlink:to="loc_us-gaap_LineOfCreditMember_01a15a62-820a-7bf1-9adc-cbf7cbcea3c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a15a62-820a-7993-aaba-c18d1f124dcb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_01a15a62-820a-7bf3-b88d-98a38166474b" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a15a62-820a-7993-aaba-c18d1f124dcb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a15a62-820a-7993-aaba-c18d1f124dcb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a15a62-820a-7993-aaba-c18d1f124dcb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a15a62-820a-7993-aaba-c18d1f124dcb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a15a62-820a-7d10-bae3-cb75009ba05a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a15a62-820a-7993-aaba-c18d1f124dcb" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a15a62-820a-7d10-bae3-cb75009ba05a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a15a62-820a-7647-8092-e902887189cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarehouseAgreementBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a15a62-820a-7d10-bae3-cb75009ba05a" xlink:to="loc_us-gaap_WarehouseAgreementBorrowingsMember_01a15a62-820a-7647-8092-e902887189cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a15a62-820a-7d51-b4b7-a7b25065974b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_01a15a62-820a-7bf3-b88d-98a38166474b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a15a62-820a-7d51-b4b7-a7b25065974b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a15a62-820a-7d51-b4b7-a7b25065974b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a15a62-820a-7d51-b4b7-a7b25065974b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a15a62-820a-7d51-b4b7-a7b25065974b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a15a62-820a-7451-a651-c65ef4d445fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a15a62-820a-7d51-b4b7-a7b25065974b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a15a62-820a-7451-a651-c65ef4d445fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_01a15a62-820a-70b8-a5e7-ccb0b42f0078" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a15a62-820a-7451-a651-c65ef4d445fb" xlink:to="loc_us-gaap_LineOfCreditMember_01a15a62-820a-70b8-a5e7-ccb0b42f0078" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_DebtInstrumentSoldTerm_01a15a62-820a-7740-b141-7e3b4e0e6de6" xlink:href="grbk-20260930.xsd#grbk_DebtInstrumentSoldTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:to="loc_grbk_DebtInstrumentSoldTerm_01a15a62-820a-7740-b141-7e3b4e0e6de6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_01a15a62-820a-7d8f-9c5e-7c435030ac51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_01a15a62-820a-7d8f-9c5e-7c435030ac51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio_01a15a62-820a-76a0-86a2-26c0ddc3ef90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:to="loc_us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio_01a15a62-820a-76a0-86a2-26c0ddc3ef90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_01a15a62-820a-72f7-982e-08d867617bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a62-820a-7d1b-848e-edbef71fa59f" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_01a15a62-820a-72f7-982e-08d867617bdb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/MortgageLoansHeldforSaleScheduleofDerivativeInstrumentsnotDesignatedasHedgingDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#MortgageLoansHeldforSaleScheduleofDerivativeInstrumentsnotDesignatedasHedgingDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/MortgageLoansHeldforSaleScheduleofDerivativeInstrumentsnotDesignatedasHedgingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_01a15a66-0704-7bd9-baa3-234bfce98fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:to="loc_us-gaap_DerivativeTable_01a15a66-0704-7bd9-baa3-234bfce98fd8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a66-0704-7f9b-86ce-0d320ec6fbe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_01a15a66-0704-7bd9-baa3-234bfce98fd8" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a66-0704-7f9b-86ce-0d320ec6fbe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7f9b-86ce-0d320ec6fbe3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a66-0704-7f9b-86ce-0d320ec6fbe3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7f9b-86ce-0d320ec6fbe3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7105-abcb-126e829fc154" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a66-0704-7f9b-86ce-0d320ec6fbe3" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7105-abcb-126e829fc154" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_01a15a66-0704-7d3b-b310-c2bcb7e4472f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7105-abcb-126e829fc154" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_01a15a66-0704-7d3b-b310-c2bcb7e4472f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_01a15a66-0704-76c2-875d-b8aa958cd09b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a15a66-0704-7105-abcb-126e829fc154" xlink:to="loc_us-gaap_ForwardContractsMember_01a15a66-0704-76c2-875d-b8aa958cd09b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_01a15a66-0704-714c-a695-ee56b207ae49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:to="loc_us-gaap_DerivativeAssets_01a15a66-0704-714c-a695-ee56b207ae49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_01a15a66-0704-7084-8f5d-4b8d40d2aec5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:to="loc_us-gaap_DerivativeLiabilities_01a15a66-0704-7084-8f5d-4b8d40d2aec5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_01a15a66-0704-71d2-a614-45f289c5d306" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:to="loc_us-gaap_DerivativeNotionalAmount_01a15a66-0704-71d2-a614-45f289c5d306" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_DerivativeNotionalAmountPullThroughPercent_01a15a67-dd90-7207-82ab-67702c9e765a" xlink:href="grbk-20260930.xsd#grbk_DerivativeNotionalAmountPullThroughPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a15a66-0704-7a22-ae1c-e5b6ca7faeb8" xlink:to="loc_grbk_DerivativeNotionalAmountPullThroughPercent_01a15a67-dd90-7207-82ab-67702c9e765a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a15a51-de3c-7803-80e2-f4c4b54e8f34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a15a51-de3c-7803-80e2-f4c4b54e8f34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a15a51-de3c-7947-a687-61f2898cb482" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a15a51-de3c-7803-80e2-f4c4b54e8f34" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a15a51-de3c-7947-a687-61f2898cb482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7947-a687-61f2898cb482_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a15a51-de3c-7947-a687-61f2898cb482" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7947-a687-61f2898cb482_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7526-8110-2f6cedcb5acf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a15a51-de3c-7947-a687-61f2898cb482" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7526-8110-2f6cedcb5acf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_01a15a51-de3c-75c1-9906-cdb523e1572f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7526-8110-2f6cedcb5acf" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_01a15a51-de3c-75c1-9906-cdb523e1572f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_01a15a51-de3c-7803-8ff9-ff42f0b62c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a15a51-de3c-7526-8110-2f6cedcb5acf" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_01a15a51-de3c-7803-8ff9-ff42f0b62c8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a51-de3c-7837-90eb-6004da521d0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a15a51-de3c-7803-80e2-f4c4b54e8f34" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a51-de3c-7837-90eb-6004da521d0b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7837-90eb-6004da521d0b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a51-de3c-7837-90eb-6004da521d0b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7837-90eb-6004da521d0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7b79-92a8-77d3864afb50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a15a51-de3c-7837-90eb-6004da521d0b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7b79-92a8-77d3864afb50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_01a15a51-de3c-75e4-b3fd-06131a78c68b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7b79-92a8-77d3864afb50" xlink:to="loc_us-gaap_ForwardContractsMember_01a15a51-de3c-75e4-b3fd-06131a78c68b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_01a15a51-de3c-77c9-9ef9-a3987af1bb6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a15a51-de3c-7b79-92a8-77d3864afb50" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_01a15a51-de3c-77c9-9ef9-a3987af1bb6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_01a15a51-de3c-73e7-9849-79ae4cf54317" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_01a15a51-de3c-73e7-9849-79ae4cf54317" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_01a15a51-de3c-7eae-bfa9-073b779e17ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:to="loc_us-gaap_DerivativeAssets_01a15a51-de3c-7eae-bfa9-073b779e17ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_01a15a51-de3c-7595-99d5-8fd97054b458" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:to="loc_us-gaap_DerivativeLiabilities_01a15a51-de3c-7595-99d5-8fd97054b458" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_01a15a51-de3c-7f3a-9484-b042bba22e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a15a51-de3c-7c1f-a6d5-47e49c39f5b2" xlink:to="loc_us-gaap_DebtInstrumentFairValue_01a15a51-de3c-7f3a-9484-b042bba22e2c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.greenbrickpartners.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="grbk-20260930.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.greenbrickpartners.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a15a22-152c-763e-87e1-a1cd1647325f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a15a22-152c-763e-87e1-a1cd1647325f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_01a15a22-152c-7ef8-9329-4fc12c9844b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a15a22-152c-763e-87e1-a1cd1647325f" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_01a15a22-152c-7ef8-9329-4fc12c9844b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-7ef8-9329-4fc12c9844b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_01a15a22-152c-7ef8-9329-4fc12c9844b1" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-7ef8-9329-4fc12c9844b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-755f-b854-1f5055ea9ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_01a15a22-152c-7ef8-9329-4fc12c9844b1" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-755f-b854-1f5055ea9ccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAgreementsMember_01a15a22-152c-7e2a-81fb-9142305c4f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-755f-b854-1f5055ea9ccd" xlink:to="loc_us-gaap_LeaseAgreementsMember_01a15a22-152c-7e2a-81fb-9142305c4f12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_TitleClosingServicesMember_01a15a22-152c-7116-9011-cac15bb5ab8b" xlink:href="grbk-20260930.xsd#grbk_TitleClosingServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_01a15a22-152c-755f-b854-1f5055ea9ccd" xlink:to="loc_grbk_TitleClosingServicesMember_01a15a22-152c-7116-9011-cac15bb5ab8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a15a22-152c-71ae-a019-670a3d6f3c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a15a22-152c-763e-87e1-a1cd1647325f" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a15a22-152c-71ae-a019-670a3d6f3c2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a15a22-152c-71ae-a019-670a3d6f3c2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a15a22-152c-71ae-a019-670a3d6f3c2c" xlink:to="loc_us-gaap_RelatedPartyDomain_01a15a22-152c-71ae-a019-670a3d6f3c2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_01a15a22-152c-7312-bf33-c8f57214fc25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_01a15a22-152c-71ae-a019-670a3d6f3c2c" xlink:to="loc_us-gaap_RelatedPartyDomain_01a15a22-152c-7312-bf33-c8f57214fc25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_01a15a22-152c-708a-8b2d-e872f6033712" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_01a15a22-152c-7312-bf33-c8f57214fc25" xlink:to="loc_srt_AffiliatedEntityMember_01a15a22-152c-708a-8b2d-e872f6033712" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_01a15a24-b1f2-7454-a4a6-ecc92e830d2f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_01a15a22-152c-763e-87e1-a1cd1647325f" xlink:to="loc_srt_OwnershipAxis_01a15a24-b1f2-7454-a4a6-ecc92e830d2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a15a24-b1f2-7454-a4a6-ecc92e830d2f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_01a15a24-b1f2-7454-a4a6-ecc92e830d2f" xlink:to="loc_srt_OwnershipDomain_01a15a24-b1f2-7454-a4a6-ecc92e830d2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_01a15a24-b1f2-7e40-aecf-c77f63dc20cf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_01a15a24-b1f2-7454-a4a6-ecc92e830d2f" xlink:to="loc_srt_OwnershipDomain_01a15a24-b1f2-7e40-aecf-c77f63dc20cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_grbk_CentreLivingMember_01a15a24-d472-75f8-8c2e-179dbc3d3330" xlink:href="grbk-20260930.xsd#grbk_CentreLivingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_01a15a24-b1f2-7e40-aecf-c77f63dc20cf" xlink:to="loc_grbk_CentreLivingMember_01a15a24-d472-75f8-8c2e-179dbc3d3330" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_01a15a22-152c-787e-bbdf-a36daf432628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_01a15a22-152c-787e-bbdf-a36daf432628" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_01a15a22-152c-7c04-b77e-1b8f0058941b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_01a15a22-152c-7c04-b77e-1b8f0058941b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_01a15a22-152c-7303-8992-07f4c4c3eb71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:to="loc_us-gaap_OperatingLeaseExpense_01a15a22-152c-7303-8992-07f4c4c3eb71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_01a15a22-152c-7b05-8781-a46d3973b3cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_01a15a22-152c-740e-9eb6-6ba8d48b7dd3" xlink:to="loc_us-gaap_AccountsPayableCurrentAndNoncurrent_01a15a22-152c-7b05-8781-a46d3973b3cc" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
