Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements of Masonite International Corporation:

(1)Registration Statement (Form S-8 No. 333-191105) pertaining to the 2012 Equity Incentive Plan and the 2009 Equity Incentive Plan,

(2)Registration Statement (Form S-8 No. 333-196894) pertaining to the 2014 Employee Stock Purchase Plan, and;

(3)Registration Statement (Form S-8 No. 333-229873) pertaining to the 2012 Equity Incentive Plan

of our reports dated February 25, 2021 with respect to the consolidated financial statements of Masonite International Corporation and the effectiveness of internal control over financial reporting of Masonite International Corporation included in this Annual Report (Form 10-K) of Masonite International Corporation for the fiscal year ended January 3, 2021.

/s/ Ernst & Young LLP

Tampa, Florida

February 25, 2021