Niagara Glass Ltd
“Not only did they install, but they also fixed the mess that the contractor left in the bathroom.”
Best Window Installers near Thorold, ON
2 of these companies are based in Thorold; the others serve Thorold from towns including St. Catharines, Niagara Falls and Beamsville.
11 open weekends · 22 rated 4.5+
Data verified October 21, 2026
Multi Service Maintenance
Great Northern Home Exteriors Inc.
“Great Northern Home Exteriors was great to work with throughout the entire process.”
Permanent Siding & Windows
“Darryl and the team were very professional and did an excellent job!”
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Window Repair Guys
“We were very happy with the workmanship as well as the guys were very friendly and efficient.”
Hamblet's Roofing Siding Windows
“Because they did our roof about 15 years ago the cost of the shingles was covered and we only paid for the labour to put them on.”
Listed for homeowners in and around Thorold, 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.
Area overview: Thorold, ON
The 24 companies on this page are rated from 4.3 to 5.0 across 1,270 reviews; 10 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (89%) and responsiveness (75%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "cleanliness". 11 are open on Saturdays and 1 on Sundays. The services the companies on this page list most often on their websites are siding (5), windows (5), doors (3), awnings (2) and decks (2). 1 lists staff certifications (GAF). Domain records put 9 websites of the companies on this page at ten or more years old; the oldest dates from 1999. 2 offer financing or payment plans; 13 give free estimates and 1 is family- or locally-owned. We have a website on file for 23 of the companies on this page; 22 publish a contact page and 17 list a public email. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Is the home visit and measurement free?
A no-cost quote is offered by 13 of the 24 companies on this page. It comes with a sales visit, so agree how long it will take before they arrive. Ask for the quote in writing on the day, itemized by window, and be wary of a discount that disappears the moment the visit ends.
A C Vinyl Windows Ltd
“Each step of the replacement process has been positive and professional; pricing, delivery & installation.”
Tip Top Exteriors
“Completed my Eavestrough and soffit installation did great work at a great price thank you!”
Precision Roofing
“Their pricing was more competitive then anyone else that had provided a quote to us.”
Marks Windows and Doors
“The owner and his staff are polite, reliable and do good work on time.”
Myles Calvert & Son Windows and Doors
“The men were friendly and provided complete details of the work they were doing.”
Niagara Egress Masters
“We contacted a few companies, but only Steve instilled confidence the job would be done right.”
Blindstech Shutters and Blinds
“His idea to have the bar set at 3/4 so we could have light come in but also keep the privacy is our favourite part.”
Gemini Windows
“Rob's team did a great job installing a window in my basement and finished the details on the inside with the trim.”
Louwes Windows & Siding
“They will give a option on what they think is best and different choices over a great company to deal with”
Smart Film Glass
“They have made right any problem I have had, and have helped me with the knowhow on repairs or install advise when needed.”
Scott Windows & Doors
“Just had windows replaced and Scott's Windows and Doors did an excellent job!”
L & L Contracting Inc.
“You are treated like family when you have a job done by them.”
The Glass Company
“I went to them and they were able to help the next day with what I needed.”
Duotemp Home Improvements
“Frank and the entire team at DuoTemp have went above and beyond to provide outstanding customer service during the initial construction, and even to this day”
Glaze Windows and Doors Inc.
“Guys were so friendly and a joy to have work on our house.”
Outlook Windows & Doors
“Neil did an excellent job for my parents home in Grassie this week.”
Fleming Windows & Mirrors Ltd
“They had what I needed, Great prices, great service.”
Aaces Contracting
“Aces did an almost complete overhaul on my home touching almost every room and they did a great job.”
Why these companies made our list
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