Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the registration statements (Nos. 333-258487, 333-202669, 333-210036 and 333-269149) on Forms S-8 and S-3 of our reports dated February 16, 2023, with respect to the consolidated financial statements of Summit Materials, Inc. and the effectiveness of internal control over financial reporting.
/s/ KPMG LLP
Denver, Colorado
February 16, 2023