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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

Ronald Akau — review for Bellwether Windows, Siding, & Doors
Ronald Akau - 19880 East 53rd Avenue , Denver, CO, US
We were impressed with the Bellwether team. Seth was professional, understanding, and listened to our design questions and concerns. Dylan, Angel and the sixteen man crew met our goals and finished the siding in three days. The entire project schedule, from siding to gutter install, was executed as promised. We appreciate and believe the Bellwether process and highly recommend this family owned company!
Brady Martin — review for Bellwether Windows, Siding, & Doors
Brady Martin - 5395 Osceola Street , Denver, CO, US
CSR and the team there are great! They have completed a few projects for us ranging from small to large. Trustworthy, responsive, thorough, fair...what more could you want. We will definitely use them for any future projects.
Andrew Cohen — review for Bellwether Windows, Siding, & Doors
Andrew Cohen - 2861 West 21st Avenue , Denver, CO, US
Bellwether was great about helping us evaluate options for a siding replacement and listening to our preferences on a desired product. Install went great and the project manager kept us updated with photos and texts throughout, and provided detailed answers to questions.
Michael Adkins — review for Bellwether Windows, Siding, & Doors
Michael Adkins - 13672 West Bates Avenue , Lakewood, CO, US
Awesome work by Colorado Siding Repair! Cash looked at my siding and gave me several different price options to work with my budget. I am selling my house and CSR moved me up in their schedule on short notice so I was able to stay on track to put my home on the market in early February.
Tracy Ramsey — review for Bellwether Windows, Siding, & Doors
Tracy Ramsey - 6341 North Dunkirk Court , Aurora, CO, US
I called Colorado Siding Repair because of some loose siding and just needed someone to reinforce it. My concern was that what I needed done would be too small of a project for any siding company and that they would try to upsell. Well, I didn't need to worry.. Josh, one of the owners, came to my home to give an estimate, and without hesitation said they would be happy to do the work AND at a fair price, putting my mind at ease! They were very thorough, checking all the siding and reinforcing a... Read more