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Horizon Windows and Doors Inc.
- Design
- Front Door
- Company
“Sasha suggested color called Iron Ore - he had sample of this color on hand and he also showed me recent pictures of their install in this particular color.”
Best Window Installers in Thornhill, ON
24 companies listed · 4 in Thornhill · 2 open 24/7 · 15 open weekends · 23 rated 4.5+
Data verified October 16, 2026
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Peaceful Windows & Doors
- Product
- Company
“I recently had the pleasure of working with Peaceful Windows and Doors for the installation of 9 windows and 2 doors, and I am absolutely thrilled with the entire experience.”
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Waysee Windows and Doors
- Company
- Team
“Guys came and did an amazing job.”
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Majesticon Windows & Doors
- Job
- Price
- Company
“He explained all of the different types of windows, the benefits of each, and even had samples to show us his build quality and the variety of colors/styles.”
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Window Caulking Toronto Experts
“They recaulked all my windows and sealed them perfectly.”
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Trust Build Windows and Doors
- Front Door
- Expertise
- Project
“It's evident that they take great pride in their work, not only ensuring a flawless installation but also ensuring that customers are left with a clean and tidy space to enjoy.”
Listed for homeowners in and around Thornhill, 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: Thornhill, ON
4 of the 24 companies we list are based in Thornhill; the other 20 serve Thornhill from towns including Concord, Toronto and Etobicoke. The companies on this page are rated from 4.2 to 5.0 across 5,259 reviews; 18 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (90%), quality (84%) and responsiveness (80%). The topics that come up most in reviews of the companies on this page are "price", "estimates" and "cleanliness". 2 are open around the clock; 15 are open on Saturdays and 9 on Sundays. 3 show a licence on their websites. 6 have ten or more years of experience, the longest 29 years. 2 offer emergency call-outs; 2 offer financing or payment plans; 19 give free estimates; 5 are family- or locally-owned and 8 list coupons or special offers. We have a website on file for all 24 of the companies on this page; 21 publish a contact page; 20 list a public email and 1 takes bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Which listed window installers say they are licensed?
3 of the 24 listings on this page show a licence on their websites. Licensing is provincial or municipal, so confirm the claim with whoever issued it. Ask separately about workers' compensation coverage, which is the document that protects you if an installer is injured working on your property.
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Alex Rozkov ️ European Windows Toronto
- Project
- Aluminum Windows
- Price
“The windows are made of soft-touch vinyl with metal inside, so far superior to Canadian products with features and performance not even available in Toronto - at a better price!”
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Amica Windows and Doors Inc.
- Results
- Clean
- Job
“Something I want to highlight was despite the current global supply chain crisis, Michael was very professional at managing my expectation ahead of time, and complete the project on time.”
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Sangster Windows & Doors
- Patio Doors
- House
- Price
“He was very helpful in guiding us through a selection of the most appropriate door and installed it for us with dispatch once it had arrived from the factory.”
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Arctic Vinyl Windows & Doors
- Patio Door
- Front Door
- Team
“We chose Arctic Vinyl primarily on the strength of very positive and compelling testimonials from several of our neighbours who had recently replaced their windows with Arctic Vinyl.”
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Window and Door Specialist
- Project
- Delivery
- Job
“It was a pleasure dealing with Ali and Kian, the owners who are very professional, knowledgeable about the products, extremely patient and always ready to answer any questions.”
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Alda Windows and Doors
- Door Installation
- Showroom
- Project
“Everyone at Alda Windows and Doors made it a smooth experience, from guidance with choices during the ordering to an on time, professional and clean install.”
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Vinyl Light Windows & Doors
- Patio Door
- Measurements
- Job
“Even though the windows were already replaced and Vinyl no longer needed to be involved, Roman was very helpful in helping us obtain the rebate that we were entitled to.”
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GTA Glass
- Job
- Price
“David did a really good, nice, clean job, very efficient and patient with all the interruptions from customers wanting to come in as he was trying to work.”
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Egress Windows Toronto
- Clean
- Quote
- Questions
“They protected inside of the house, each guy did his part without asking, were done in few hours as good team, worked without breaks or smoking or delay.”
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Citypro Aluminum
- Work
- Downspouts
- Job
“In fact the original wood was still visible since no company had ever been able to install new soffits because the gap between our neighbours house was actually only 18".”
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Magic Windows and Doors
- Blackout Blinds
- Insect
- Manufacturing
“Recently, I had the opportunity to witness the exceptional service provided by the Magic Windows team when they promptly addressed my issue with a sticking screen door latch.”
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Northstar Glass
- Fair
- Storefronts
- Team
“I purchased from them 4 large mirrors and a dinner table glass top; they came home to take measurements and installed these items in less than 24 hours.”
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Nordik Windows and Doors
- Accountability
- Consumers
- August
“We recently had the pleasure of working with Bobby from Nordik Windows and Doors to upgrade our home's windows and doors, and it was a fantastic experience.”
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Windowtech Windows and Doors Replacement Services
- Sliding Door
- Competitive
- Questions
“I had the WindowTech team come out and install the clear security protection film on all my ground level windows and was very satisfied with the quality of workmanship and service.”
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Global Improvement Solutions Inc.
- Patio
- Crew
- Efficient
“Burlington and they did a superb job from start to finish; from ordering the windows to the customer service and getting my windows installed they did a great job.”
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Window Man
- Company
- Project
- Happy
“From the time we first met with him to discuss the installation and decide on the door (colour and style) to the time the door was installed it was perfect communication and he delivered as he promised.”
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Aimg
- Quality
- Gutters
- Team
“It was a pleasure working with Yuri and the other professionals at AIMG and we will definitely hire them again when it comes time to renovate other areas of our home.”
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GTA Door Systems
- Exterior Door
- Home
- Team
“Leo removed two worn out hinge pins on our vintage aluminum exterior commercial office door, installed a continuous hinge, and replaced the worn-out closing mechanism.”
Why these companies made our list
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