Fiberglass Windows

Made from patented Duracast® fiberglass composite, Pella® Impervia® fiberglass windows are a budget-friendly, low-maintenance alternative to wood replacement windows. They resist warping in the heat and defend against winter weather, and are available in an array of color choices to complement your home.

At Pella of Westerly, we have found that Pella Impervia windows are a fitting choice for homeowners who want the warm look of a painted wood window with the top-notch reliability and excellent energy efficiency that come with a fiberglass window. Supported by our industry-leading warranty, Pella Impervia replacement windows require little to no maintenance, offering striking beauty and performance season after season.

Pella® Impervia® Series

  • Constructed from Duracast®—the strongest, most durable material you can get in windows
  • Impressive performance
  • The high-end look of a painted wood window
  • ENERGY STAR®-rated options help conserve energy
Available Styles
  • Awning
  • Casement
  • Double-Hung
  • Single-Hung
  • Sliding
  • Basement
  • Bay and Bow

Look into fiberglass windows at your nearby Pella showroom or click below to plan a free, in-home consultation and discover the windows that meet the needs of your home.



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