Colorado Fiberglass Windows

From heavy winter snows to the heat of mid-summer, the Colorado climate can be tough on your home’s exterior. Having high-quality, efficient windows is the ideal way to protect your property for the long term, and Bordner is the company that has been trusted to provide top-of-the-line fiberglass windows to local homeowners since 1987. Over the years, we’ve built our reputation on installing high-quality, customized products, and we’re also proud to be a business that is: 

  • Accredited With the BBB
  • A+ Rated and Highly Recommended by Past Customers
  • A winner of the Angie’s List “Super Service Award”
  • Recognized for “Compliant-Free Service” with the Better Business Bureau
  • Committed to the Satisfaction of Our Customers

Lifetime Value With Replacement Fiberglass Windows in Colorado

When you want the highest-quality replacement fiberglass windows in Colorado that also offer striking atheistic appeal, turn to the products from Bordner. Our fiberglass window installers can help you find the ideal window for the unique needs of your home, and we offer everything from seamless picture windows to bow, slider, and double-hung styles.

The fiberglass windows that we install are renowned for their low-maintenance upkeep and exceptional weather resistance, and we offer products from top manufacturers that deliver:

  • Superior Efficiency: Fiberglass is the perfect material for lowering heating and cooling bills, and our windows come with high-tech features that make them one of the most efficient choices on the market.
  • Long-Term Durability: With the ability to hold up to extreme weather, forced entry, and changing temperatures, replacement fiberglass windows keep your home secure without the need for constant maintenance.
  • Customizable Style Options: From the look of woodgrain to custom paint, stain, and glass styles, we offer numerous ways for you to get new windows that perfectly complement your home.
  • Warranty Protection: At Bordner, our fiberglass window installers stand behind the quality of our products and services with industry-leading warranties and a satisfaction guarantee.

Find Out More About the Quality Difference of Our Fiberglass Window Products

Choosing the right fiberglass windows for your Colorado home is a big decision, and you can’t go wrong working with the professionals at Bordner to get the job done right—at a price that you can afford. Give us a call today to learn more about why our replacement windows are the preferred choice throughout the region, or fill out our online form to request a free, in-home estimate!

50% Off Installation Labor + FREE Hi-Transparency Screen Upgrade

To see why 97% of our customers would recommend us to family and friends, schedule your free in-home estimate today!

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Our Remodeling Projects

When Colorado residents need remodeling services, we're there to help. Check out the many projects we've completed throughout the area.

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Why Choose Vinyl when Fiberglass is the Best?


  • Maintenance - Don't need to re-stain and can match any style, even wood!
  • Strength - Fiberglass is 8 times stronger than vinyl windows
  • Materials- Thinner frame so you won't lose any glass space!
  • Stability - Great at insulating for energy and noise control
  • Quality - Highest quality window in the market that lasts up to 50 years
  • Added Bonus: Lifetime Warranty


  • Maintenance - Vinyl can warp in heat, but can handle rapid temperature fluctuations
  • Strength - Easy to install and don't require consistent painting
  • Materials - While you can see "scar marks", vinyl is a more affordable option
  • Stability - Expands and contracts at higher rates, but generally long-lasting