Primoris Services (PRIM) 10-K2022 FY Annual report

Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-248535, No. 333-161331, and No. 333-174602) and Form S-8 (No. 333-264840, No. 333-252160, No. 333-188553, and No. 333-159491) of Primoris Services Corporation (the “Company”), of our report dated February 27, 2023, relating to the consolidated financial statements of the Company and the effectiveness of internal control over financial reporting of the Company, appearing in this Annual Report on Form 10-K of the Company for the year ended December 31, 2022.

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/s/ Moss Adams LLP

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San Diego, California

February 27, 2023