Exhibit 99.1

EXHIBIT 99.1       CLAYTON SERVICES LLC (“CLAYTON”) DUE DILIGENCE NARRATIVE REPORT

Clayton Contact Information

Client Service Management:

Chris Turk

Client Service Manager

Phone: (813) 472-6509/E-mail: cturk@clayton.com

Joe Ozment

Director of Securitization

Phone: (813) 261-0733/E-mail: jozment@clayton.com

Overview

On behalf of Redwood Trust, Clayton conducted an independent third-party pre-securitization due diligence review of 132 residential loans selected for the SEMT 2025-7 transaction.

The loans referenced in this narrative report were reviewed on a flow basis from February 2025 to June 2025 at Clayton’s centralized underwriting facilities in Tampa, FL. This narrative report provides information about the original lenders, the scope of work performed by Clayton, and the results of Clayton’s review.

Originators

Origination channels for the loans in this review:

Clayton’s Third Party Review (“TPR”) Scope of Work

The scope of work for this transaction consisted of credit, property valuation, and regulatory compliance reviews, plus a data integrity check, and were performed in accordance with rating agency¹ loan level review standards in place as of the date of the review. This is referred to as a “Full Review.”

¹ Standard and Poor’s, Moody’s, Fitch, Kroll , DBRS & Morningstar

Sampling

For all originators in this transaction the loans received a Full Review. For Redwood Trust all of the loans were selected for a Full review and the remaining loans received a “Limited Review” as described below.

Review Type Loan Counts:

Sponsor Acquisition Criteria

The loans were originated to Redwood/Jumbo Program Eligibility Guide Select QM Version 2.3, 2.4, 2.5, 2.8, 2.9

Loan Grading

The Sponsor Acquisition Criteria referenced above served as the benchmark for grading loans from a credit underwriting, property valuation and regulatory compliance perspective, as applicable. Each loan received an “initial” and a “final” grade. The “initial” grade was assigned during the initial loan review. The “final” grade takes into account additional information and supporting documentation that may have been provided by the originators to clear outstanding conditions. Clayton’s loan grading is solely based on Clayton’s independent assessment of all guideline exceptions and compensating factors for each of the component reviews. Clayton is providing a comprehensive loan-level analysis as part of this pre-securitization reporting package that includes initial grades, final grades and detailed commentary on the rationale for any changes in grades, and sets forth compensating factors and waivers.

Clayton’s loan grading complied with rating agency grading definitions published by Moody’s, Standard and Poor’s, Fitch, Morningstar, Kroll and DBRS.

TPR Component Review Scope

Clayton examined the selected loan files with respect to the presence or absence of relevant documents, enforceability of mortgage loan documents, and accuracy and completeness of data fields. Clayton relied on the accuracy of information contained in loan documentation provided to Clayton.

Credit Review

Clayton’s Credit scope of review conducted on this transaction included the following elements (for more detail, please refer to Appendix A and to the guidelines cited above):

Property Valuation Review

Clayton’s Property Valuation scope of review conducted on this transaction included the following elements:

Regulatory Compliance Review

Clayton’s Regulatory Compliance scope of review conducted on this transaction included the elements summarized below. (For more detail, please refer to Appendix C and to the guidelines cited above.)

Clayton utilized its proprietary eCLAS engine for regulatory compliance testing.

The scope of the compliance review performed is summarized below:

Clayton evaluated the lender’s exclusion of discount points from the 3% points and fees calculation for all loans in this transaction using a 0.2% rate reduction threshold per discount point. However, client reserves the right to review on a case-by- case basis.

OF NOTE: As of October 3, 2015 (“TRID Effective Date”), Clayton commenced testing applicable loans subject to the TRID Effective date against a TRID scope of review that was based on outside counsel’s interpretations of the published regulations as of the TRID Effective Date. Clayton’s scope was commercially reasonable as it relates to a Third Party Review (“TPR”) firm’s role as TPR conducting an independent third-party pre-securitization due diligence review (“Initial TRID Scope”). The Initial TRID Scope was created with guidance from outside counsel.

On, June 15th, SFA published its RMBS 3.0 TRID Compliance Review Scope © documentation, developed under the leadership of members from Third Party Review (“TPR”) firms across the industry and SFA’s RMBS 3.0 Due Diligence, Data and Disclosure Working Group. The RMBS 3.0 TRID Compliance Review Scope was created with an aim to facilitate a uniform testing and risk identification standard as it would apply to an assignee, as a result of a consistent Truth-In-Lending Act liability interpretation according to the understanding of prevailing legal precedent and informal written guidance and webinars offered by the CFPB, as it applies to the Know Before You Owe / Truth In Lending Act (“TILA) – Real Estate Settlement Procedures Act (“RESPA”) Integrated Disclosure (“TRID”) Rule (78 FR 79730, as amended). RMBS 3.0 TRID Compliance Review Scope may be formally amended by the SFA RMBS 3.0 Due Diligence, Data and Disclosure Working Group as clarifying regulations may be promulgated on a go forward basis, as well as any binding judicial interpretations of the underlying law.

Following the June 15^th formal publication of the RMBS 3.0 TRID Compliance Review Scope ©, Clayton reviewed prior testing results dating back to the TRID Effective Date, and applied the enhanced RMBS 3.0 TRID Compliance Review Scope.

Clayton applied the enhanced RMBS 3.0 TRID Compliance Review Scope to all loans in this transaction.

Data Capture

Clayton collected data fields required to create American Securitization Forum (“ASF”). The file format was provided as part of the pre-securitization reporting package. Additionally, Clayton captured rating agency required data points relating to ATR/QM determination, which is provided in the reporting package.

Data Integrity

Clayton utilized its proprietary eCLAS tool to determine tape to file accuracy of each reviewed loan, by completing the following steps:

Data Compare Results

Clayton provided Redwood Trust with a copy of the Loan Level Tape Compare Upload which shows the differences between the data received by the sellers versus the data captured by Clayton during the loan review.

Summary of data compare results:

Clayton received the following data fields listed below from RWT and provided a summary of the discrepancies above. We did not include the deltas found for borrower names and addresses for PII purposes.

Clayton Due Diligence Results

Below are the initial and final overall loan grades for this review, as well as the credit, property valuation, and regulatory compliance component review grades.

Initial and Final Overall Loan Grade Results

The overall grade summary reflects the combination of the credit, property valuation and regulatory compliance component reviews into one overall grade. The overall grade assigned is the most severe grade from each of the component reviews.

Initial and Final Credit Component Grade Results

Initial and Final Property Valuation Grade Results

Initial and Final Regulatory Compliance Grade Results

Clayton Third Party Reports Delivered

Clayton furnished the following reports on this transaction:

Appendix A: Credit Review Scope

For each mortgage loan, Clayton performed a guideline review utilizing specific guidelines furnished at the time of the review.

Appendix B: Origination Appraisal Assessment

For each Mortgage Loan, Clayton performed the following origination appraisal analysis:

Appendix C: Regulatory Compliance Review Scope

This appendix provides an overview of Clayton’s proprietary compliance system for 1-4 family residential mortgage loans in the due diligence process to determine, to the extent possible and subject to the caveats below, whether the loans comply with federal, state and local laws. The Disclaimer section explains limitations that you should be aware of. Additional details on the items listed below as well as Clayton’s state, county and municipal testing can be provided upon request. The compliance engine is fully integrated into Clayton’s proprietary due diligence platform, eCLAS.

Federal Law

Truth in Lending Act and Regulation Z – (continued)

OF NOTE: As of October 3, 2015 (“TRID Effective Date”), Clayton commenced testing applicable loans subject to the TRID Effective date against a TRID scope of review that was based on outside counsel’s interpretations of the published regulations as of the TRID Effective Date. Clayton’s scope was commercially reasonable as it relates to a Third Party Review (“TPR”) firm’s role as TPR conducting an independent third-party pre-securitization due diligence review (“Initial TRID Scope”). The Initial TRID Scope was created with guidance from outside counsel.

On, June 15th, SFA published its RMBS 3.0 TRID Compliance Review Scope © documentation, developed under the leadership of members from Third Party Review (“TPR”) firms across the industry and SFA’s RMBS 3.0 Due Diligence, Data and Disclosure Working Group. The RMBS 3.0 TRID Compliance Review Scope was created with an aim to facilitate a uniform testing and risk identification standard as it would apply to an assignee, as a result of a consistent Truth-In-Lending Act liability interpretation according to the understanding of prevailing legal precedent and informal written guidance and webinars offered by the CFPB, as it applies to the Know Before You Owe / Truth In Lending Act (“TILA) – Real Estate Settlement Procedures Act (“RESPA”) Integrated Disclosure (“TRID”) Rule (78 FR 79730, as amended). RMBS 3.0 TRID Compliance Review Scope may be formally amended by the SFA RMBS 3.0 Due Diligence, Data and Disclosure Working Group as clarifying regulations may be promulgated on a go forward basis, as well as any binding judicial interpretations of the underlying law.

STATE, COUNTY and MUNICIPAL LAW

Clayton test whether a loan meets the thresholds for a higher-priced, rate spread, subprime or nonprime mortgage loan, and whether such loan meets regulatory requirements, in the following states:

Clayton test whether a loan meets the thresholds for a high cost or covered loan in the following states, counties and municipalities, and also tests for compliance with provisions in such laws that apply to all loans subject to high cost testing:

Several states have laws that do not create a separate class of high cost or higher-priced mortgage loans, but set APR or finance charge ceilings and may also set forth similar anti-predatory lending restrictions as found in high cost laws. Clayton tests for compliance with such laws in the following states:

Clayton uses a module that reports to the client the factors that the client can weigh to determine whether or not the loan is in the borrower’s interest, and also makes a mathematical determination as to whether or not there is at least one benefit. This module is only used in the following states, where the laws or releases by the regulators provide an indication of some standards that can be applied.

Several states have laws that neither create a separate class of high cost or higher-priced mortgagee loan, nor impose a ceiling on the overall fees or APR, but nonetheless contain requirements and restrictions on mortgage loans that may impact the assignee or the lien. Clayton tests for compliance with such laws, including late charge and prepayment penalty provisions, in the following states and municipalities:

See attached Exhibit A - Consumer Protection Laws for additional details on the specific components of the aforementioned Consumer Protection laws that are evaluated as part of the Clayton Compliance Review Scope:

In addition to identifying whether Texas refinances are cash out transactions subject to the Texas Constitution Article 16 Section 50(a)(6) requirements, Clayton reviews the title report to confirm prior loans being refinanced are continuous purchase money and not (a)(6) loans. In the event a loan is determined to be a Texas Home Equity loan, the underwriter reviews the loan images to confirm the loan meets the Texas requirements including maximum LTV/CLTV, 3% fee cap, product restrictions and the required disclosures were provided to the borrower in accordance with required timelines.

GSE Testing

Clayton can review loans to determine whether they comply with Fannie Mae’s and Freddie Mac’s Points and Fees threshold tests. These fee limitations of 5% for all loans with application dates prior to 1/10/2014 were reduced to 3% on Primary and Second Homes for applications on or after 1/10/2014. If requested, loans can be reviewed to determine whether the loan is a residential mortgage transaction ineligible for delivery due to its APR or fees exceeding the HOEPA thresholds. Clayton offers Lender Letter and non-traditional mortgage testing for Fannie Mae. (Note: Fannie Mae requires a non-disclosure agreement between the client and Fannie Mae for Clayton to report these results.)

Disclaimer

Please be advised that Clayton has not determined whether the Loans comply with federal, state or local laws, constitutional provisions, regulations or ordinances, including, but not limited to, licensing and general usury laws that set rate and/or fee limitations, unless listed above. Clayton’s review is focused on issues that raise concerns for secondary market investors and other assignees, based on potential for assignee liability, an adverse impact on the lien, and regulatory, litigation and headline risk. Clayton’s review is not designed to fully test a lender’s compliance with all applicable disclosure and licensing requirements. Furthermore, the findings reached by Clayton are dependent upon its receiving complete and accurate data regarding the Loans from loan originators and other third parties. Please be further advised that Clayton and its employees do not engage in the practice of law, and the findings set forth in the reports prepared by Clayton do not constitute legal advice or opinions.

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This material is confidential and may not be copied, used, or distributed without the written permission of Clayton Services LLC.