Roof Worx
“I was able to convince my HOA that one of Roofworx products was very similar to one approved by the architectural committee; thankfully, it was approved.”
Best Window Installers in Thornton, CO
24 companies listed · 5 in Thornton · 3 open 24/7 · 18 open weekends · all 24 rated 4.5+
Data verified October 27, 2026
Kelly Construction
“Scott is truly a perfectionist and skilled in his work, no corners were cut (so to speak) and he always consulted with us prior to committing to the inevitable workarounds that occur during construction projects.”
Sky Manor Roofing & Exteriors
“Cody at Sky Manor was the best, we made our very first insurance claim and it felt so easy thanks to his instructions and he checked in regularly to make sure everything was going smoothly.”
Carlson Siding & Construction
“At the end of the day tools were picked up and all materials and products put away prior to leaving, the outside parameter of the house was left clean during and after installation.”
On the Spot Window & Door Services
“Great service, affordable price, excellent quality”
K&G Window Pros
“I have been doing renovations on my home all year and have had bad experience after bad experience until I found this company to do my windows and French doors not only is the work exceptional and professional the details they put into making you fee...”
Listed for homeowners in and around Thornton, CO, these 24 companies fit and repair windows. Frame materials, glass options and any credentials shown are taken from company websites; the customer lines are quoted from public reviews.
Area overview: Thornton, CO
5 of the 24 companies we list are based in Thornton; the other 19 serve Thornton from towns including Denver (11 mi), Golden (19 mi) and Lakewood (18 mi). The companies on this page are rated from 4.5 to 5.0 across 8,089 reviews; 21 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (91%), responsiveness (86%) and quality (82%). 3 are open around the clock; 17 are open on Saturdays and 6 on Sundays. The services the companies on this page list most often on their websites are commercial roofing (5), windows (4), doors (3), gutters (3) and painting (3). 4 show a license on their websites and 9 have a BBB rating of A or A+. Domain records put 14 websites of the companies on this page at ten or more years old; the oldest dates from 1999. 3 offer emergency call-outs; 10 offer financing or payment plans; 12 give free estimates; 11 are family- or locally-owned and 6 list 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.
Do the listed window companies all have premises in Thornton?
5 of the 24 give an address in Thornton itself; the others serve it from within 20 mi. Many window companies work from a showroom that covers a wide area, so the address tells you little. What matters is whether the crew is employed by them or subcontracted, and who returns for warranty work.
Colorado Superior Roofing & Exteriors
“Edit: Had to work with Superior a few times to get additional documentation for our insurance company and Kevin was amazing about getting back to me quickly with the relevant information.”
Renewal by Andersen Window Replacement
“Just had four windows installed yesterday, the two installers showed up on time, took out the old a installed in a very timely and professional manner, cleaned up and took the old windows with them.”
Angelo & Sons Doors & More
“Angelas suggestion to keep consistent appearance to the property and her product and project management knowledge clearly inherited by her Father kept my project from start to finish on time with no missteps and no sub contactor involvement.”
Window World
“They did pull a permit and when we ran into issues with the inspection with the city they took care of all of the problems at no extra cost to me and even gave me a gift card for the inconvenience.”
J&K Roofing
“From our initial meeting to review and evaluate my roof to navigating me through the insurance process and managing the roofing, I was impressed with his knowledge and professionalism.”
Roper Roofing & Solar
“He explained the process well, was there to meet with the insurance adjuster and help make sure we got full value from them, and always checked up after any work was complete to make sure things were done well.”
Pioneer Home Solutions
“Pioneer did a great job working with our insurance company to get things approved that were absolutely necessary but being denied - what a huge service!!”
Mighty Dog Roofing
“I'm sure that anyone that the pleasure of doing business with mighty dog roofing and having jorge guide you will certainly be taken care of and appreciated at having met you when you leave with a smile.”
Koala Exteriors
“Koalaty was able to meet our needs and they have a zero-pressure sales ethic, which was such a relief for us after dealing with two other siding companies and high-pressure sales.”
UB Code Roofing +
“Smith sat down and explained everything in detail, and was very honest about his findings and what he would do to correct the problem and kept his word, we are extremely pleased with the outcome of the work done, I would recommend U.”
Refined Exteriors
“We did a ton of shopping around and while RE wasn't the cheapest, they also weren't the most expensive, even compared to a few companies that only do vinyl siding.”
Kraftwork Design
“We were skeptical finding a trusted and professional roofing company but your team was easy to communicate with and understand what was needed to fix our damaged roof.”
Company Roofing and Exteriors
“I talked to Erick Vera he was very patient and understanding and when it was time to do the work he and his men worked very fast, efficient and very clean work.”
K&H Home Solutions
“No hassle sales process (a big plus compared to other vendors), great price for a great window (we sought estimates from 5 vendors), install team was amazing and the windows look great!”
Prestige Products Inc
“It's been 4 years and their post install customer service has responded to every need we've had in our full-house window and door replacement with them.”
Colorado Windows and Restoration
“They excelled in everything from communication to professional timely follow up when issues arose to polite installers to high quality installation methods.”
All Seasons Exteriors
“Everyone from the owner to the workers were amazing, friendly, professional, and went above and beyond to make sure that we were satisfied with their work.”
Discount Windows & Siding
“The service, selection and prices were fantastic.”
Why these companies made our list
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