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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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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Cole Carosella
Everyone at Colorado Siding was great from the field team of Cash and his crew to the office of Kari and Karen, we had a great experience with Colorado Siding and would highly recommend. They are very transparent, communication is great, and they are available and responsive. The finished product looks great. 5/5 stars earned.
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Karen MacDonald
To update our 75 year old house, we wanted new siding accent walls, a new window, and paint. We have worked with many contractors for renovation and landscaping, so we know how quickly things can go wrong. We were therefore *very impressed* with Colorado Siding Repair, from the initial bid process, through the design, delivery, and final result. They are very professional, personable, and skilled. The crew who did the work showed up on time, paid attention to details, did great work, and were ha... Read more
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Peter Hopkins
Colorado Siding Repair replaced the siding on our entire house with James Harding siding and did a fantastic job. Stephen worked with us through the whole process to plan the project and configure the job the way we wanted; the computer-assisted drawings really helped us make some important decisions and be confident that we would be happy with the outcome. Everyone was so professional, competent and friendly. Thank you CSR!
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M Martinez
The 1 star is not for the actual quality of work - I have no idea the quality. They sent a sales person out. He said he would have a quote by the that weekend. Several weekends have passed and no quote. I called and emailed the sales person and copied the person who coordinated the visit. No response. Not only is this incredibly unprofessional but absolutely rude. How hard is it to hit reply? If they don't have time to do the work or do not want the work then say so. Neither was indicated by the... Read more
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Ken Mcleish
Removed our swamp cooler on side of the house. Put in new siding which matched our old siding exactly and painted it. Can't tell the hole for cooler was ever there. Did a fantastic job!