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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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
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
1555 West Thomas Avenue , Englewood, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Aged Pewter
  • Other Services
  • Other Services: Siding
1555 West Thomas Avenue , Englewood, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Timber Bark
  • Other Services
  • Other Services: Siding
1555 West Thomas Avenue , Englewood, CO, US
  • HardiePlank Select Cedarmill Siding
  • HardiePlank Select Cedarmill Siding: Timber Bark
  • Other Services
  • Other Services: Siding

Customer Testimonials

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Katie Wood - 1292 West Long Avenue , Littleton, CO, US
Overall, Bellwether is priced in the middle of the pack, they have quality workmanship and are incredibly fast. My siding was removed and replaced and painted in four days (compared to a neighbor's siding, where the other company took several weeks). It looks great! I had some issues with disorganized or missed communication, but after the project the owner sat down with me to discuss lessons learned so he could take that feedback forward. To me, that speaks to the companies dedication to qualit... Read more
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Jeanne Dassel - 1267 Stardust Circle , Castle Rock, CO, US
Bellwether and crew were superb. Materials and support arrived as scheduled. Project managers were checking in regularly. Adjustments were seamless. The whole project proceeded from start to finish as promised.
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Ed Hester - 3130 North Buttercup Circle , Frederick, CO, US
Had all of our siding replaced by Bellwether with James Hardie siding. They finished off the job by sealing and painting all eaves and trim work not replaced. Final product looks great. They had a few items to come back and complete and did so quickly and to our satisfaction. Great pricing, great communication. Would have given 5 starts but the installation crew did not do a good job of cleaning up everyday after they finished work. There was a dumpster literally in the driveway but our ... Read more
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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