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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

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
400 South Steele Street , Denver, CO, US
  • Other Services
  • Other Services: Windows
  • Other Services: Doors
32834 Snowshoe Road , Evergreen, CO, US
  • Other Services
  • Other Services: Windows
  • Other Services: Doors

Customer Testimonials

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Dave Kleiber
We live in Steamboat. We tried and tried to find a local contractor to re-insulate, instal new windows, and re-side our 120 year old mountain home. Couldn't get anyone locally to even return a phone call. My wife reached out to Bellwether and three days later we were meeting with their rep and planning our project. Within a month our remodel began. We were amazed by how quick, professional, and skilled the crews were. They tore off the old siding and insulation and removed the old windows... Read more
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Mitch Gerstenkorn
Customer Service is Unbelievable. Let’s just say my job had challenges and Paul, Cole, and Karen didn’t give up until it was all done to my satisfaction. I just noticed, somehow one side of one window didn’t get caulked, I shared a picture with Cole (over a year after the initial completion) and he came out immediately and addressed the problem! Over the top customer service is something most companies have forgot, but bellwether knows how to treat its customers! I will plan to use bellwether... Read more
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Ada Van Roekel
Bellwether was phenomenal. Cash came to the house in May after a large hail storm that damaged the vinyl on multiple sides. He spent over an hour talking with me, answering questions, and reviewing options. I said I didn't want a big beige house, and wanted to find a new, modernized aesthetic. He took my elementary ideas and ran with them, giving me a bid and first rendering in only a few days. We could tell from the visual rendering that it would be a stand-out house! Then it was about the proc... Read more
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Pam Lanza
Bellweather was great to work with from sales team, site manager and installation crew. They showed up on time and did an excellent job. The crew was very nice and respectful and the workmanship is outstanding. When the project was completed, the crew walked the site with us to make sure everything was satisfactory, then, the site manager walked the project with us and went over every inch of caulk, piece of flashing and board. It was installed by James Hardy Board trained people who knew what t... Read more
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Kristen Eatmon
Pella windows are good quality...