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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

Andy Edwards — review for Bellwether Windows, Siding, & Doors
Andy Edwards - 6636 North Windmont Avenue , Parker, CO, US
We had a great experience. We had our siding replaced. They had a huge crew and it was completed in 3 days! My wife and I were shocked how fast they went, they were working hard to get it done before a cold front came in. The crew was great, cleaned up, and got the dumpster out quickly. Having your siding replaced is very loud, so I would recommend planning to be out of the house for the first 2 days (or get some good ear plugs!) Great experience, good pricing, great project manager and crews... Read more
Michelle Bailey — review for Bellwether Windows, Siding, & Doors
Michelle Bailey - 8802 South Holland Court , Littleton, CO, US
Bellwether has upgraded my siding, improved my home’s insulation, and their installment teams worked skillfully and swiftly. I feel like I have a brand new house! It looks great, and I feel confident it will for years to come.
Michelle Bailey — review for Bellwether Windows, Siding, & Doors
Michelle Bailey - 8802 South Holland Court , Littleton, CO, US
The entire process, from proposal to completion, was a breeze. My home looks beautiful, and I am secure in knowing that the new siding installed by Bellwether is superior to the one it replaces.
Jennifer Mitchell — review for Bellwether Windows, Siding, & Doors
Jennifer Mitchell - 5690 Xenon Court , Arvada, CO, US
We are very happy with our new siding, front door and windows. A shout out to Laura, Cole and Angel for making our house look new again! All three were professional, knowledgeable and kind.
Megan Biller — review for Bellwether Windows, Siding, & Doors
Megan Biller - 28585 Evergreen Manor Drive , Evergreen, CO, US
Great experience beginning to end. Laura O., Dylan, Amy, and Angel really took care of us and got what we needed and wanted within a reasonable budget for the project. No complaints and would definitely recommend to friends and family.