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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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.

Bellwether Windows, Siding, & Doors reviews on GoogleBellwether Windows, Siding, & Doors reviews on Project Map It
Patty Sible — review for Bellwether Windows, Siding, & Doors
Patty Sible - 611 Elizabeth Avenue , Platteville, CO, US
I highly recommend Colorado Siding Repair for their high quality product, quick responsiveness, very competitive pricing & top notch professional staff. When I contacted Colorado Siding Repair, David promptly visited our home to review the siding work that was needed. He explained in detail the reason we were seeing our siding issues & offered some advice to prevent these issues going forward. When sending the quote he offered two options, instead of telling us we needed to replace the siding on... Read more
Dave and Bev Henke — review for Bellwether Windows, Siding, & Doors
Dave and Bev Henke - 18284 East Berry Drive , Centennial, CO, US
Excellent products, professional and knowledgeable staff, competent crews, fair pricing.
Tyra Vickers — review for Bellwether Windows, Siding, & Doors
Tyra Vickers - 8070 South San Juan Range Road , Littleton, CO, US
Steve Dennis and his team at Bellwether did an amazing job replacing the siding on my entire house. They were fast, efficient and thorough. I highly recommend Bellwether to anyone needing siding work.
Laine Greaves-Smith — review for Bellwether Windows, Siding, & Doors
Laine Greaves-Smith - 350 Old Hughesville Road , Black Hawk, CO, US
Bellwether did a great job putting James Hardie siding on my cabin near Black Hawk. The crew worked quickly and took care of any issues. There were some issues with material delivery, but the PM took care of them and made sure a solution was figured out. Great work! I'm glad I chose to work with them.
Bruce LaBarr — review for Bellwether Windows, Siding, & Doors
Bruce LaBarr - 2138 Sunstone Drive , Fort Collins, CO, US
Bellwether Siding provided exceptional service. They replaced the siding on my home with impressive speed and maintained high-quality workmanship throughout the process. The team was courteous, and their follow-up was thorough, promptly addressing all minor concerns. I highly recommend them for any siding projects. Special thanks to David Dembiski for ensuring everything went smoothly.