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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

7066 East Maplewood Avenue , Centennial, CO, US
  • Other Services: Siding
  • Other Services
11624 Quivas Circle , Westminster, CO, US
    West 8th Avenue , Denver, CO, US
    • Other Services
    • Other Services: Windows
    • Other Services: Doors
    315 Morgan Drive , Loveland, CO, US
    • Other Services
    • Other Services: Windows
    • Other Services: Doors
    3424 Wabash Street , Denver, CO, US
    • Other Services
    • Other Services: Windows
    • Other Services: Doors

    Customer Testimonials

    Reviewer photo
    Pete Lamborne
    We worked with Cash, Paul, and foreman Mario on a big siding, gutter, painting job. Absolutely pleased with these guys, from the workmanship and attention to detail to their work ethic and honesty. We've done a lot of work on our house and CSR is one of the rare teams that compel me to go out and write a review. They helped us stage colors and design, stayed on budget, worked quickly and effectively, and did very clean quality work. Clean cuts, extra coats of paint, flashing on everything (whic... Read more
    Reviewer photo
    Peter T.
    The best thing about Colorado Siding & Repair (unlike the other siding companies I had called before engaging them) is that they do partial replacement and repair in addition to full siding replacement. Other area companies will not do partial replacement/repair of damaged siding. This is a niche they have in this market. I basically needed only one and a half sides of my house's siding replaced. Despite a few minor scheduling hiccups along the way, my interactions with the conscientious Cash St... Read more
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    Rod Manzur
    Great company to work with. Fair price and attention to detail. Josh, the owner, is reachable and great to work with. Manuel is a great carpenter and paint team very efficiant.