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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

KA Wolff, True Up LLC — review for Bellwether Windows, Siding, & Doors
KA Wolff, True Up LLC
Colorado Siding Repair is awesome. My home had defective steel siding from a previous property owner, that had been installed over old batten board siding. They did a great job removing and replacing it with new Hardie board. My home is beautiful now! Mike and his crew were professional, kind, dependable and did incredible quality work. Colorado Siding communicated well throughout the process and completed the job as agreed in the time frame agreed. Really a great experience.
Michael Fischer — review for Bellwether Windows, Siding, & Doors
Michael Fischer
Colorado Siding Repair was great to work with on our siding project. I spoke to 5 different contractors, and Keith at CSR was the only representative who took the time to answer my questions in great detail. He also didn't expect a commitment on the very first day. He was very knowledgeable about the product and honest about different options for repairing or replacing the siding. On top of that, CSR was very competitive on price. The whole process from signing the contract and scheduling went s... Read more
Derren D — review for Bellwether Windows, Siding, & Doors
Derren D
CSR did an excellent job replacing our EIFS siding, soffits, and fascia. It was a real pleasure working with this contractor!
mary kate dick — review for Bellwether Windows, Siding, & Doors
mary kate dick
Cash and his guys did an AMAZING job, and were patient and flexible with me as I had to schedule a mason to do some repairs in between when CSR installed new trim/fascia and siding and when they painted everything. Cash was able to walk me through several options, and worked with my budget to ensure maximum visual impact. I am super happy, and my 130+ year old house looks a ZILLION times better—like a new house.
David Haller — review for Bellwether Windows, Siding, & Doors
David Haller
We used Colorado Siding Repair (CSR) to 1) repair specific exterior trim/siding water damage from poor builder design; 2) replace all exterior trim to avoid future issues from poor builder design; 3) repaint exterior; 4) add custom shutters to exterior; and 5) add gutters for improved protection. I tried to contact several businesses to get quotes on this project, and most would not call me back, given the scope of work. But CSR was game and Cash was my first point of contact. Cash was informat... Read more