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Whether you're replacing outdated wood siding, upgrading to vinyl or fiberglass windows, or enhancing curb appeal with a new front door, we deliver expert craftsmanship and personal service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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Jen Ross - 32172 Lodgepole Drive , Evergreen, CO, US
We had our siding, soffits, fascia, and windows replaced by Bellwether and we could not be happier with the work or the customer service. The pricing was very comparable to other estimates we received, they outlined the process and even came out ahead of schedule. We were due to get a snowstorm when scheduled, and rather than cancel, they sent out two crews, over 15 people, to get the job done in a couple of days. I also very much appreciated the help with the design. Our house doesn't have much... Read more
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Estelle Kew Hoehl - 6620 South Billings Way , Centennial, CO, US
After several siding quotes, I chose to work with Colorado Siding repair for full exterior James Harding replacement. I know not to go with the cheapest quote out there and play games with me later. CSR Josh, Cash, Keith were helpful, honest, reasonable and had great crew and after sales service. We are happy with their siding job. There are some punch list items to fix after the job but I will highly recommend this to my friends. This is not a paid review like what other shady companies try to ... Read more
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Alli Romano - 1916 Fairfax Street , Denver, CO, US
CSR is the best! They gave my house a much-needed facelift with fresh new siding. They also painted so everything looked great. Professional, hard-working crew and Steve is a great salesperson to work with. Highly recommend!
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Richard Snyder - 1675 Spring Water Lane , Littleton, CO, US
The staff at CSR was great to work with. They were professional, polite, and responsive. From Cash providing a thorough estimate to Paul, the owner, coming out to give me an overview of what to expect to the crew who takes great pride in their work..... a top notch organization. Katlyn in customer service deserves a shout out as well. Would absolutely use hem again.
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Clemens Wan - 5980 North Florence Street , Denver, CO, US
We installed a new Sierra Pacific door and 3 Pelle windows in our Lennar house in the northend area. The process took around 3 months and we're super pleased with the quality and care towards making our vision into a beautiful reality. The design process was super smooth and gave us a lot of ideas to work with while considering the structural integrity and resell value. The actual work days where the house was in a mess was less than 6 days, but scheduling and holidays was a factor in making sur... Read more