Great Northern Home Exteriors Inc.
“We were very impressed with the work that was done installing 5 windows and 3 doors in our home, so impressed that we have gone ahead to have another door and window installed.”
Best Window Installers in St. Catharines, ON
15 companies listed · 12 in St. Catharines · 6 open weekends · 10 rated 4.5+
Data verified October 21, 2026
Permanent Siding & Windows
“The price was reasonable as well compared to the other quotes we received which were extremely expensive!”
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Window Repair Guys
“We've called on Window Repair Guys twice in the last coupla years and both times they were quick to come out to measure, very affordable and fast install!”
Scott Windows & Doors
“Scott was able to determine a replacement was not necessary, made the necessary adjustments to the installation and saved me thousands of dollars.”
Gemini Windows
“We will definitely continue to use Gemini for all our roofing, window, door, and siding needs for our home and business.”
Marks Windows and Doors
“We shopped around given the full replacement needed (6 quotes) and Mark's price was easily the best.”
Listed for homeowners in and around St. Catharines, ON, these 15 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.
Area overview: St. Catharines, ON
12 of the 15 companies we list are based in St. Catharines; the other 3 serve St. Catharines from Thorold (8 km) and Niagara-on-the-Lake (10 km). The companies on this page are rated from 3.8 to 5.0 across 1,355 reviews; 8 have 50 or more reviews and 10 are rated 4.5 or higher. The topics that come up most in reviews of the companies on this page are "price" and "estimates". 6 are open on Saturdays and 2 on Sundays. Domain records put 7 websites of the companies on this page at ten or more years old; the oldest dates from 2000. 1 offers financing or payment plans; 9 give free estimates and 2 are family- or locally-owned. We have a website on file for all 15 of the companies on this page; 14 publish a contact page; 10 list a public email and 1 takes bookings online. 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.
Do the listed window companies all have premises in St. Catharines?
12 of the 15 give an address in St. Catharines itself; the rest serve it from within 10 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.
Tip Top Exteriors
“Joe suggested things that we did not think to have done to our house and because of that alone, the finished work was better than anything the other contractors could have done.”
Glaze Windows and Doors Inc.
“Just had them install a new patio sliding door - Fred was very helpful and professional.”
Fleming Windows & Mirrors Ltd
“On Wednesday May 21 Fleming windows and mirrors installed 2 large Bay windows at our house.”
Frontier Windows and Doors
“We replaced several windows in our home and Patrick helped us achieve the modern look and feel we were hoping for, within our budget and timeframe.”
Royal Building Solutions
“Great prices, awesome staff and amazing customer service.”
Modern Windows
“They replaced our front door and triple sliding patio door last year and we recently had them back to replace several windows.”
Tradewood Industries
“Two weeks later they provided new updated glass units and recommended who best to install them.”
Niagara Glass Ltd
“Yet Mike from Niagara Glass was able to finesse the install of a stationary shower glass wall and 2 larger mirrors beautifully.”
Friesen Windows & Siding
“Amazing company, great finish and great price.”
Why these companies made our list
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