Take a look at our past work!

Bellwether Windows, Siding, & Doors

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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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


Check out some important pages from our company's website:


Read what 190+ clients have said about our services:

Our Work

355 East 112th Drive , Northglenn, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Trad Red
  • Other Services
  • Other Services: Siding
274 Washington Street , Golden, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Monterey Taupe
  • Other Services
  • Other Services: Siding
10238 Andee Way , Littleton, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Primed
  • Other Services
  • Other Services: Siding
Harlan Street , Westminster, CO, US
  • Norandex Woodsman Select Siding
  • Norandex Woodsman Select Siding: Olive
  • Other Services
  • Other Services: Siding
3370 South Marion Street , Englewood, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Boothbay Blue
  • Other Services
  • Other Services: Siding

Customer Testimonials

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Melissa Clark
Customer service was amazing, they responded to all questions and concerns very quickly and effectively. Cash was wonderful to work with he all ways got right back to me and took care of any questions or concerns. We had an electrical issue and he went above and beyond to resolve it quickly.
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Sam Nizam
Amazing Service and workmanship, very competitive prices. Very happy. Thank you again
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Rae Johnson
The quality of work was excellent. They did everything they to make sure we were pleased. The price was fair and the finished project is better than we expected.
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Sheryl Jones
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.
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Rick Hanni
"They did not fall short in any way. The crew that they sent out, I think Cash was the salesperson--he had four or five crews--the crews they sent out to my house were great. They were organized, friendly, and professional. I couldn't have asked for anything more-- completely top notch. In fact, I made sure to put their business card in a safe place b/c I'm going to have some additional repairs on siding, and they're going to do the work.