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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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
Vivian Gallant — review for Bellwether Windows, Siding, & Doors
Vivian Gallant
Though the job started a bit bumpy with the foreman being changed out right before the job, Luis and especially Carlos took the reins and did an amazing transformation on our house. Beginning with David who designed a very complex siding facade, then it was well translated off the paper into reality. We were so impressed with and grateful for the hardworking Belwether employees who gave their utmost to get things right as well as their care and respect for our home. Thank you.
Ginny Donovan — review for Bellwether Windows, Siding, & Doors
Ginny Donovan
I've been thrilled with the service I've received from Bellwether. They did a beautiful job on my siding a couple years ago, and I've just now worked with them to replace my windows. Everyone involved with the company has been great to work with - polite, professional and thorough. One of the things that stood out to me is that I never had to remind anyone what color trim I had when I scheduled my window replacement, they knew what I had had done previously and ordered accordingly. They're very ... Read more
Christopher Hill — review for Bellwether Windows, Siding, & Doors
Christopher Hill
Had a fantastic experience with the whole team at Bellwether to reside our 1970s home. They were not the only quote we received, not the lowest bid either, and wow are we glad we went with them. From the first consult with Seth to working directly with the owners, our family is satisfied with the final look and follow up. The team worked fast even with construction happening on our street the first morning. They have been ultra responsive and accommodating for all our nitpicky details. Thank ... Read more
Bell L — review for Bellwether Windows, Siding, & Doors
Bell L
Cash Stricker was great and caught a couple of punchout items we hadn't noticed! It's stressful living in a construction zone for a week but the end result looks so good. Looking forward to comparing heating bills from past years now that our home has been ungraded to have OSB sheathing and Hardiewrap.
A Williams — review for Bellwether Windows, Siding, & Doors
A Williams
The installation of the siding was excellent.