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exterior home in the evening with pella fiberglass windows

Fiberglass Windows

brown pella Impervia fiberglass single-hung window

Why choose fiberglass windows?

Trusted in tools, boats, bridges and more, fiberglass is a naturally strong and durable material, making it a superior choice for windows. Pella’s proprietary fiberglass material is the strongest material for windows, engineered for lasting durability.9 Our exclusive fiberglass will never rot or corrode, and it resists dents, bends and breaks.

Fiberglass window benefits

verified Durable and Strong

The best fiberglass windows for your home are incredibly strong and durable. Resisting dents, bends and breaks, fiberglass window frames have virtually no expansion and contraction to help improve energy efficiency, reduce the risk for seal failure and provide long-term stability for dependable operation.

sunny_snowing Weather Resistant

Fiberglass is designed to provide outstanding resistance to water, wind and outside noises. It can withstand large temperature swings and the rigorous performance requirements of a commercial building.15

thumb_up Maintenance-Free

Durable fiberglass material will never rot or corrode and is naturally resistant to water and bugs. It resists chipping, chalking and fading - so you never need to paint or refinish your fiberglass windows.

Pella's Fiberglass

What makes Pella's fiberglass different from the competition.

Want to know more?

Want to know more?

Learn more about our proprietary fiberglass material and see how we stack up against the competition.

Fiberglass Product Lines

Explore Pella Impervia Fiberglass Windows

Pella® Impervia® Fiberglass Windows

  • Made of proprietary fiberglass
  • Unmatched strength and lasting durability9
  • Sleek, timeless style
  • Exceptionally energy efficient

Fiberglass Window Inspiration

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Fiberglass Window Tips & Advice

Fiberglass Window Before & After Projects

Browse through our projects to view our windows used in real life and see the difference a new window can make on your home.

Frequently Asked Questions

Where to Buy

Where to Buy

Features & Options

Features & Options

Limited lifetime warranty

Pella products are backed by some of the strongest warranties in the business.

Learn About Our Warranty