We’re the Leaders in Fiberglass Windows for Homeowners in Boulder, CO

Upgrading anything in your Boulder, Colorado, home can be a tremendous investment. That’s why we prioritize delivering exceptional residential window services and commercial window services tailored to your needs. Whether you’re looking for window replacement or window installation, we focus on quality, efficiency, and style to enhance your living spaces.

1st Choice Windows and Siding provides custom fiberglass windows with lasting value and superior performance. With our extensive experience, we help homeowners achieve greater comfort, energy savings, and aesthetic appeal. We believe in solutions that stand the test of time, including fiberglass window repair and window maintenance services.

Fiberglass is the Future

The future is here. Fiberglass windows are engineered to outperform traditional window materials. At 1st Choice, we offer top brands such as Milgard, known for its cutting-edge designs and reliability. You can also take it further with our selection of Andersen’s Fibrex line of products. As a result, you get a stronger, more durable, and more energy-efficient window than anything else you can buy.

Fiberglass windows offer quality window insulation, which improves protection against heat transfer in your home and makes them the best noise-reduction windows on the market. Our UV protection windows also offer superior protection against the sun. Truly, the engineering possibilities are endless with these windows.

But What Else?

Our windows are also engineered to outperform traditional window materials. Fiberglass is stronger, more durable, and more energy-efficient than vinyl or wood alternatives, making it the perfect choice for modern homes.

Make a Wise Choice

Ready to transform your home with energy-efficient windows and professional window installation? Contact 1st Choice Windows and Siding today to schedule your free consultation. Let our trusted window contractors in Lakewood, CO, help you upgrade to custom fiberglass windows designed to impress.

“I could not believe how fast they got the job done and how well done it was! They obviously were very careful about every detail. The house looks fantastic and everyone I talked to at the company was great to work with. The guy who did the inspection for the people who bought our house even asked us who did the siding because they did such a great job!”

Abby C
Committed to Craftsmanship

Let Us Be Your 1st Choice for Home Improvement

The Team to Trust for Top-Notch Service
Learn More About Us
Affordable Remodeling Solutions

Convenient Financing Plans Available

Home Upgrades for Less Than You Would Pay for a Cup of Coffee a Day

Explore Financing Options

“Window replacement was for our elderly mother and the professionalism of the entire 1st Choice team, greatly appreciated by the family - we did not have to worry that mom was being sold a 'bag of goods.' Love the new windows! Noise reduction, energy efficiency, look, all just great!”

- Jane W

“I could not believe how fast they got the job done and how well done it was! They obviously were very careful about every detail. The house looks fantastic and everyone I talked to at the company was great to work with. The guy who did the inspection for the people who bought our house even asked us who did the siding because they did such a great job!”

- Abby C

“Chris was an absolute gem to work with and the window suggestions were perfect. The home was built in 1962 and had all of the old steel frame windows which were losing energy rapidly. We noticed an immediate change in the environment inside the house and the outside looks fantastic. Great installers.”

- Carol S
Mastic logo
Milgard logo
Anlin logo
Crane siding logo
LP SmartSide logo
Simonton logo
BBB logo
Diamond Kote logo
Angie's List logo
Vesta logo