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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

1555 West Thomas Avenue , Englewood, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Boothbay Blue
  • Other Services
  • Other Services: Siding
  • HardiePlank Select Cedarmill Siding: Boothbay Blue
  • HardiePlank Select Cedarmill Siding: Evening Blue
  • HardiePlank Select Cedarmill Siding: Night Gray
  • HardiePlank Select Cedarmill Siding: Mountain Sage
  • HardiePlank Select Cedarmill Siding: Timber Bark
  • HardiePlank Select Cedarmill Siding: Aged Pewter
  • HardiePlank Select Cedarmill Siding: Iron Gray
  • HardiePlank Select Cedarmill Siding: Cobblestone
  • HardiePlank Select Cedarmill Siding: Gray Slate
  • HardiePlank Select Cedarmill Siding: Arctic White
  • HardiePanel Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Light Mist
  • HardiePlank Select Cedarmill Siding: Khaki Brown
  • HardiePanel Select Cedarmill Siding: Cobblestone
199 County Road 8038 , Fraser, CO, US
  • HardiePanel Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Rich Espresso
  • Other Services
  • Other Services: Siding
  • HardiePanel Select Cedarmill Siding: Rich Espresso
151 West Sycamore Lane , Louisville, CO, US
  • HardiePlank Smooth Siding
  • HardiePanel Select Cedarmill Siding: Primed
  • Other Services
  • Other Services: Siding
  • HardiePlank Smooth Siding: Primed
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Aged Pewter
1029 North Garfield Avenue , Loveland, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Arctic White
  • Other Services
  • Other Services: Siding
  • HardiePlank Select Cedarmill Siding: Arctic White
5358 East Costilla Drive , Centennial, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePanel Select Cedarmill Siding: Arctic White
  • Other Services
  • Other Services: Siding
  • HardiePlank Select Cedarmill Siding: Arctic White

Customer Testimonials

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Kelly Toney - 899 Evergreen Parkway , Evergreen, CO, US
We could not have had a better experience with Bellwether. They were professional, on time, delivered a beautiful quality product, and met all of our expectations. The ease of their process was a breath of fresh air. We completely re-sided the outside of our house from old mountain cedar siding to gorgeous James Hardie board and batten fiber-cement siding. They also handled replacement of all of the 40 year old windows in the house. It was a big job handled like clock-work. We had nothing but co... Read more
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Kim Ruhland - 853 Cypress Drive , Boulder, CO, US
Colorado siding repair (now Bellwether) is certainly interested in providing the best service and workmanship possible. Their siding crews are excellent, taking great care and pride in installation to the customer's satisfaction. Communication is excellent . Paul, one of the owners, in particular, personally ensures that everything is done accurately and to your specifications. When you get a bid, they are not high pressure and give you a fair estimate,, unlike some of the other five-star ra... Read more
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David Lavigne - 4495 Wellington Road , Boulder, CO, US
I have used CSR on three separate properties over the last year and have had great results! Their quality of work, communication, and follow-up by Cash and Paul and other CSR employees exceeded my expectations. Cash and Paul always made sure that the work was done properly and followed up with Covid based supply chain difficulties. I would definitely recommend them for any of the work that is listed below, and will use them again on other properties. Property one had a full exterior siding r... Read more
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Amanda Andrew - 6907 West Roxbury Avenue , Littleton, CO, US
They just finished our job and I’m completely satisfied. They did new windows, James Hardie siding, gutters and fixed our roof over the porch. Their crew was incredible. Hard working, extreme attention to detail, easy to work with and nice to my kids. I’m so impressed. Our house looks beautiful and is water tight!
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Jessica Salazar - Himalaya Court , Denver, CO, US
Bellwether did an excellent job replacing the siding on our home with the James Hardie siding, from the beginning of the project to finish everyone was great. Cash the salesperson was very polite and explained the how the process works,Lee came out prior to installation to let us know exactly what would be done during installation. Cole the project manager kept everything running smooth and kept me updated on the progress of the project. Angel the insallation crew leader was vey polite and made... Read more