Bellwether Windows, Siding, & Doors of Colorado

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About Us

Based in Denver, we proudly serve the greater Colorado Front Range and mountain communities, including cities such as Aurora, Boulder, Colorado Springs, Fort Collins, and surrounding areas, even reaching into Cheyenne, Wyoming.. Reach out to us if you’d like a consultation, (303) 323-8578

About Us

At Bellwether, we’re Colorado’s top-rated exterior remodeling company specializing in fiber cement siding, energy-efficient window replacement, and custom entry doors. As the #1 James Hardie siding installer in Colorado, we help homeowners protect and beautify their homes with durable, weather-resistant materials built for Colorado’s unique climate.

Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service every step of the way. Our award-winning designs and certified installation teams ensure long-lasting value and stunning results.

We’re proud to serve the Front Range and beyond, helping families fall in love with their homes again.


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Read what 190+ clients have said about our services:

Recent Work

2981 East 163rd Place,Thornton, CO, US

2981 East 163rd Place , Thornton, CO, US
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6824 Olympus Drive,Evergreen, CO, US

6824 Olympus Drive , Evergreen, CO, US
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  • Other Services
  • Other Services: Siding

Customer Reviews

See what our customers are saying — click any logo to read our reviews on that platform.

Joyce Touchton — review for Bellwether Windows, Siding, & Doors
Joyce Touchton - 3967 South Pearl Street , Englewood, CO, US
They provided excellent service from beginning to end. Our new windows are beautiful and the process of planning and installation was so easy. The installation team was extremely professional and considerate, we could not be happier with Colorado Siding and Repair!
Mirella Hetland — review for Bellwether Windows, Siding, & Doors
Mirella Hetland - 6580 North Windloch Circle , Parker, CO, US
We have worked with Bellwether on two projects now and have been delighted with every aspect of the process each time. From initial contact to Project completion they routinely hit all of the marks and certainly earn their 5 Star rating. Our 2023 project with them replaced our poorly maintained Cedar Plank siding with James Hardie siding. In 2026, we used them for Siding and Soffit/Facia to complete the exterior of our house. Communication from the team is always amazing, and I have to rave a... Read more
M Forrester — review for Bellwether Windows, Siding, & Doors
M Forrester - 14613 West 62nd Circle , Arvada, CO, US
We were very pleased with the work done by Bellwether Siding. We needed replacement siding, but the profile we have is no longer available. They were flexible in making sure the work done was what we actually needed. I especially appreciate that they were willing to do a smaller job, just three walls, rather than the whole house. Alejandro, the crew lead, was excellent. Great communication and follow up.
Donna Gordon — review for Bellwether Windows, Siding, & Doors
Donna Gordon - 7481 Exeter Court , Castle Pines, CO, US
Bellwether did a great job of replacing the siding on our home with pre-primed Hardie board in Castle Pines. The siding looks perfect and the detailing was done with precision. We couldn't have been happier with the responsiveness of the company to any questions or concerns we might have and the crew worked well to complete the project in a timely fashion. It was a pleasure to work with the administrative staff, too. There was always a friendly and helpful voice on the other side of the line ... Read more
Dan Rowe — review for Bellwether Windows, Siding, & Doors
Dan Rowe - 133 South Sherman Street , Denver, CO, US
My project was very unique. I only needed to replace my gables and side a shed to match. I had 5 different quotes and Bellwether was the only reasonable one that was eager to do the job. I couldn't be happier with how it came out. It was such a small 4-day project and they worked outside of their comfort zone on my unique shed situation (4 doors and swing-in window). Thank you so much for doing the great work at a reasonable price!