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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

Reviewer photo
Kristen Cudish
I was paid to remove my old review but I had a new issue come up because of their neglect and over promised and under delivered service...when Seth came to the house for our consultation I asked multiple times if they would be removing the old insulation he assured me they would which somehow didn't make it into the itemized list along with a window which is how they got the bid...anyway the crew stripped my house down when I asked why they weren't taking the old insulation that the paper had st... Read more
Reviewer photo
Richard Wand
When we decided to replace all of our home's windows, we talked to a number of window contractors at the annual home and garden show. We really liked the folks at Bellwether and decided they were who we wanted to do business with. They did not disappoint. From the sales and bidding process through the installation, Bellwether was nothing short of excellent in their performance. I've dealt with a lot of contractors over the years while my wife and I remodeled our large 1997 fixer-upper. Wind... Read more
Reviewer photo
Eric B
The Bellwether team provided excellent services throughout the process of developing and carrying out our fire-resistant (James Hardie) siding project. Teri on the sales side was very responsive and happily answered all of our questions. Dennis and the installation team communicated the requirement of our project well and did an impeccable job with the installation. We didn't even find anything to put on a punch list after they were done. Karen was patient and flexible -- a pleasure to work with... Read more
Reviewer photo
Roxann Ingersoll
Workmanship on the outside was good. Some of the inside boards were not aligned correctly. Also, communication with the company was not as good as when we had used them in the past. However, we would not hesitate to use Bellwether for future projects.
Reviewer photo
John L
Just had Bellwether install James Hardi siding on my son’s house. They did an excellent job . The communication was very good. Everyone we dealt with was friendly knowledgeable and very helpful. The crew that came out to do the work did an excellent job and cleaned up the work site very well. We have hired many contractors over the years and this was one of the best that we have worked with. Do not hesitate to have them for your project..