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24 companies listed · 18 in St. Catharines · 1 open 24/7 · 10 open weekends · 19 rated 4.5+
Data verified October 18, 2026
Listed for homeowners in and around St. Catharines, ON, these 24 companies fit and repair windows. Frame materials, glazing options and any credentials shown are taken from company websites; the customer lines are quoted from public reviews.
18 of the 24 companies we list are based in St. Catharines; the other 6 serve St. Catharines from Niagara Falls (17 km), Thorold (1 km) and Welland (22 km). The companies on this page are rated from 4.0 to 5.0 across 1,145 reviews; 9 have 50 or more reviews and 19 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (90%) and responsiveness (76%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "cleanliness". 1 is open around the clock; 10 are open on Saturdays and 1 on Sundays. The services the companies on this page list most often on their websites are siding (4), windows (4), decks (2), doors (2) and exterior doors (2). 1 lists staff certifications (GAF). Domain records put 11 websites of the companies on this page at ten or more years old; the oldest dates from 1999. 1 offers emergency call-outs; 3 offer financing or payment plans; 12 give free estimates; 2 are family- or locally-owned and 1 lists coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
18 of the 24 give an address in St. Catharines itself; the rest serve it from within 25 km. A showroom often covers a whole region, so distance matters less than who does the installing. Ask whether the fitters are employees, and how a callback in the middle of winter is handled.
