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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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
Katie Stone — review for Bellwether Windows, Siding, & Doors
Katie Stone - 26126 South End Road , Kittredge, CO, US
When I purchased my home in 2021, it was dressed in the original cedar siding -- and it was forty years old. When animals started chewing through my walls I knew it was time to replace it. As a single woman and first time homeowner, the estimates I was given were often marked up significantly and I felt confused and nervous about the entire process. I had spoken with Steve the year prior when I was under contract, and his warm and honest demeanor was immediately disarming. When I hit him up a ye... Read more
Marissa Hammond — review for Bellwether Windows, Siding, & Doors
Marissa Hammond - 2673 South Holland Street , Lakewood, CO, US
Had a great experience getting new siding on my whole house. The process was super fast and everyone on the team was so nice. Steve was an awesome salesman and Angel and his install team did such a great job. I would highly recommend if you want new siding.
Randall Fullington — review for Bellwether Windows, Siding, & Doors
Randall Fullington - 3400 Vine Street , Denver, CO, US
We've worked with six or seven contractors over the past two years while remodeling our house. Colorado Siding Repair was one of the very best. I would recommend them to anyone.
Sheryl Jones — review for Bellwether Windows, Siding, & Doors
Sheryl Jones - 5517 West Hinsdale Place , Littleton, CO, US
We really couldn't be more happy about it. We were most satisfied with the price, quality & professionalism of the staff. The quality of work was excellent. They did everything they could to accommodate our needs and make sure we were pleased. The price was fair and the finished project is better than we expected.
Paul Wagner — review for Bellwether Windows, Siding, & Doors
Paul Wagner - 11351 East 161st Avenue , Brighton, CO, US
Great job. Very easy to work with. They were more than happy to come back and correct a few items that were not quite up to my satisfaction in a timely manner.