Summit Materials (SUM) 8-K Financial Statements and Exhibits

Exhibit 23.1

Consent of Independent Auditors

We consent to the incorporation by reference in the registration statements (No. 333-258487, 333-202669, 333-210036 and 333-269149) on Form S-8 and S-3 of Summit Materials, Inc. of our report dated February 29, 2024, with respect to the consolidated and combined financial statements of Argos North America Corp. and subsidiaries, which report appears in the Form 8-K of Summit Materials, Inc. dated April 26, 2024.

/s/ KPMG LLP

Atlanta, Georgia
April 26, 2024