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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

Peter Hopkins — review for Bellwether Windows, Siding, & Doors
Peter Hopkins
Colorado Siding Repair replaced the siding on our entire house with James Harding siding and did a fantastic job. Stephen worked with us through the whole process to plan the project and configure the job the way we wanted; the computer-assisted drawings really helped us make some important decisions and be confident that we would be happy with the outcome. Everyone was so professional, competent and friendly. Thank you CSR!
Ken Mcleish — review for Bellwether Windows, Siding, & Doors
Ken Mcleish
Removed our swamp cooler on side of the house. Put in new siding which matched our old siding exactly and painted it. Can't tell the hole for cooler was ever there. Did a fantastic job!
Jesse Granger — review for Bellwether Windows, Siding, & Doors
Jesse Granger
CSR worked out great! We were selling our house and the inspector noticed some warping in the siding. The sun damage put the deal at risk so we needed and expert opinion right away. CSR had someone come out for an assessment super quick and wrote up a full report assuring the buyer the damage was merely cosmetic. Saved us a bunch of trouble and time! Thanks, Colorado Siding Repair!
Breezy Schaefer — review for Bellwether Windows, Siding, & Doors
Breezy Schaefer
Everything about this company was amazing. Exceptional service, high quality product and the finished project looks better than I imagined. Cash was extremely knowledgeable when it came to his products and him and his group were so responsive. They made scheduling quick and easy and the employees working on the project were on time and finished that day. There is no project too big or too small for them. I will definitely be using Colorado Siding Repair for my future home project needs.
Erin McCloskey — review for Bellwether Windows, Siding, & Doors
Erin McCloskey
What started as a daunting and what I thought was an urgent situation ended beautifully with the help of Cash, Paul, Miaque and the entire crew at CSR! My old vinyl siding was literally falling off my house. I received quotes from three different companies and chose to go with Cash and CSR—even though they weren’t the least expensive option—because Cash took the time to talk through everything with me and made sure I understood my options and how I ended up in the predicament I was in (do not pa... Read more