Fiberglass Windows

Crafted from patented Duracast® fiberglass composite, Pella® Impervia® fiberglass windows are a cost-friendly, low-maintenance alternative to wood replacement windows. They prevent warping in the heat and shield your home from winter weather, and are carried in a variety of color choices to complement your taste.

At Pella of Boston, we have discovered that Pella Impervia windows are a fitting choice for homeowners who want the warm look of a painted wood window with the superior durability and notable energy efficiency that are a part of a fiberglass window. Covered by our industry-leading warranty, Pella Impervia replacement windows need very little maintenance, ensuring striking beauty and performance season after season.

Pella® Impervia® Series

  • Constructed from Duracast®—the strongest, most durable material you can get in windows
  • Excellent performance
  • The quality 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

Take a closer look at fiberglass windows at your local Pella showroom or click below to plan a free, in-home consultation and uncover the windows that meet the needs of your budget.



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