Exhibit 21.1

MASONITE INTERNATIONAL CORPORATION

SUBSIDIARY LIST AS OF February 26, 2019 *

Austria

Masonite Austria GmbH

Canada

0993477 B.C. Unlimited Liability Company

Crown Door Corp. (Ontario)

Sacopan, Inc. (Quebec)

Chile

Masonite Chile Holdings

Masonite Chile S.A.

China

Masonite (Shanghai) Trading Company Limited

Costa Rica

Inversiones Premdor S.A.

Masonite Costa Rica S.A.

Technoforest Del Norte S.A.

Cyprus

Liora Enterprises Limited

Czech Republic

Masonite CZ spol S.R.O.

India

Masonite Doors Private Ltd.

Israel

Open Gallery Ltd. (f/k/a Masonite Israel)

Premdor Ltd.

Ireland

Masonite Ireland

Masonite Europe

Masonite Components

Luxembourg

Masonite Luxembourg S.A.

Malaysia

Magna Foremost Sdn Bhd

Mexico

Masonite Mexico S.A. de C.V.

Netherlands

Premdor Karmiel Holdings B.V.

Poland

Masonite PL Sp. z.o.o.

Turkey

Premdor Kapi Sanayi Ve Ticaret, A.S.

Ukraine

SC Premdor Ukraine

United Kingdom

Door-Stop International Limited

DW3 Products Group Limited

DW3 Products Holdings Limited

Eclectic Systems LP

Hickman Industries Limited

LOCO2MMC Limited

Masonite Europe Limited

Passivdor Limited

Performance Doorset Solutions, Inc.

Premdor Crosby Limited

Premdor U.K. Holdings Limited

Solidor Limited

ToolsDecor Limited

Window Widgets (2006) Limited

Window Widgets LLP

ZEROCO2MMC Limited

United States

California

Eger Properties

Delaware

Masonite Corporation

(d/b/a Advisar)

(d/b/a Algoma)

(d/b/a Algoma Express)

(d/b/a Birchwood Best)

(d/b/a Birchwood Lumber & Veneer)

(d/b/a Bolection Door)

(d/b/a Bridgewater Wholesalers)

(d/b/a BWI)

(d/b/a Florida Made Door)

(d/b/a Florida Millwork)

(d/b/a Marshfield Doorsystems)

(d/b/a Masonite Architectural)

(d/b/a Masonite Display)

(d/b/a Mohawk Flush Doors)

(d/b/a USA Wood Door)    

Florida

Sierra Lumber, Inc. (f/k/a Florida Made Door)

Door Installation Specialists Corporation

Oklahoma

Dominance Industries, Inc.

* Excludes certain non-significant subsidiaries that are either discontinued or immaterial.