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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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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Richard Bartosik
After going through the process of vetting several companies and receiving quotes for windows and siding, we decided to move forward with Bellwether. As you may have already figured out (if you're reading this you're likely shopping for a company), this process is not always the most pleasant as the companies vary greatly with the products they prefer, the prices can be drastically different even for the same products, and the overall feel of the representative that you're working with. To begi... Read more
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sheila ewing
Great experience with Bellweather Windows and Siding. From start to finish everyone I worked with was super! I had James Hardie siding and 4 Pella replacement windows installed. Seth, the salesperson was friendly, informative and clearly explained the process. Cole, the project manager kept the operation running smoothly and kept me in the loop with the progress of the job. Julio, the head of the installation crew was incredibly diligent in making sure they all got the job done efficiently each... Read more
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Vivian Gallant
Though the job started a bit bumpy with the foreman being changed out right before the job, Luis and especially Carlos took the reins and did an amazing transformation on our house. Beginning with David who designed a very complex siding facade, then it was well translated off the paper into reality. We were so impressed with and grateful for the hardworking Belwether employees who gave their utmost to get things right as well as their care and respect for our home. Thank you.
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Ginny Donovan
I've been thrilled with the service I've received from Bellwether. They did a beautiful job on my siding a couple years ago, and I've just now worked with them to replace my windows. Everyone involved with the company has been great to work with - polite, professional and thorough. One of the things that stood out to me is that I never had to remind anyone what color trim I had when I scheduled my window replacement, they knew what I had had done previously and ordered accordingly. They're very ... Read more
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Christopher Hill
Had a fantastic experience with the whole team at Bellwether to reside our 1970s home. They were not the only quote we received, not the lowest bid either, and wow are we glad we went with them. From the first consult with Seth to working directly with the owners, our family is satisfied with the final look and follow up. The team worked fast even with construction happening on our street the first morning. They have been ultra responsive and accommodating for all our nitpicky details. Thank ... Read more