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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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

6585 South Wright Street , Littleton, CO, US
  • Other Services
  • Other Services: Siding
1414 Goldeneye Lane , Brighton, CO, US
  • Other Services
  • Other Services: Siding
  • Other Services: Soffit Trim & Fascia
South Simms Street , Lakewood, CO, US
  • Other Services
  • Other Services: Siding
West 43rd Avenue , Denver, CO, US
  • Other Services
  • Other Services: Siding
2365 South Marion Street , Denver, CO, US
  • Other Services
  • Other Services: Siding

Customer Testimonials

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Mitch Gerstenkorn - 10466 West Fremont Place , Littleton, CO, US
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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janet kidd - 23541 Genesee Village Road building 15, Golden, CO, US
Great business to work with
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Monica Smith - 1429 Flannagan Court , Erie, CO, US
I had an excellent experience working with Bellwether! From the initial consultation with Seth to the final walkthrough with Dylan. The team was professional and efficient. The quality of their work exceeded my expectations, and they made sure to keep me informed throughout the entire process. The project was completed on time and within my budget, which I truly appreciated. I highly recommend Bellwether for anyone looking for reliable, high-quality window replacement, painting and construction... Read more
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Jay Blue - 469 3rd Street , Severance, CO, US
Our experience with Bellweather and having new windows installed has been awesome! From first contact with Seth our Project Guide who helped us determine what kind of windows and pricing would best fit our needs and budget; to then working with the Project Manager Dylan who prepped us on what to expect, scheduled all of the work, and walked with us through the entire process; to the installation team and their lead Angel, all of whom were extremely good at their work, very kind, respectful, and... Read more
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Ronald Akau - 19880 East 53rd Avenue , Denver, CO, US
We were impressed with the Bellwether team. Seth was professional, understanding, and listened to our design questions and concerns. Dylan, Angel and the sixteen man crew met our goals and finished the siding in three days. The entire project schedule, from siding to gutter install, was executed as promised. We appreciate and believe the Bellwether process and highly recommend this family owned company!