Pella® Impervia® Fiberglass Bay Window
4.27
Pella Impervia fiberglass bay windows combine architectural beauty with unmatched durability. These striking windows feature a three-window design with a fixed center window flanked by two operable side windows, creating additional interior space and expansive views. Crafted from Pella's proprietary fiberglass material, these windows deliver superior strength with slim profiles.
- Operable side windows can be casement, single-hung or double-hung windows.
- Commercial grade strength and performance.15
- Offered in 30° and 45° angles to complement both contemporary and traditional homes.
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Pella Impervia Bay Window Features

Resists Bends, Dents and Breaks

Enhanced Energy Efficiency

Strongest Material for Windows 9
Design Options
Pella Impervia fiberglass products have a long-lasting factory powder-coat finish in your choice of five colors. Dual-color frames have White on the interior with Brown, Tan, Morning Sky Gray or Black on the exterior.
Solid-Color Frames

Black

Brown

White

Morning Sky Gray

Tan
Dual-Color Frames

White Interior with Black Exterior

White Interior with Brown Exterior

White Interior with Morning Sky Gray Exterior

White Interior with Tan Exterior

Material
- Pella Impervia products are made from our proprietary fiberglass material, the strongest material for windows, engineered for lasting durability.61
- Our long-lasting powder-coat finish meets AAMA 624, which is a highly-rated fiberglass coating.
- Exclusive thermoset material won't expand, warp or sag in summer heat, or shrink and turn brittle in harsh winter conditions.
- Secondary Secure Vent Lock for extra protection.
Downloads & Specifications
Design, Performance & Size Tables
2D Cross Section
Pella Impervia Bay Window Specs & Install Details
- Comes as three windows at 30° or 45° angles and designed for exterior walls with 40” of space or more
- Offered with casement, single-hung or double-hung windows
- Tested and designed for the extremes
- Long-lasting powder-coat finish meets AAMA 624
- Support cables must be attached to structural members capable of supporting 1,300 lbs
Pella Impervia Reviews
Frequently Asked Questions
FAQs about My Product
Are fiberglass windows efficient?
Yes, Pella's 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. In addition to the material of the window frame, glass types and coatings also affect the energy efficiency of a window.
What are the benefits of a bay window?
Bay windows can increase your living space by providing you with an area to create a reading nook, additional seating or even a display shelf. The large window configuration also provides increased natural light to your home, making the space feel larger and more open. Bay windows also add curb appeal by creating a stylish architectural statement on the exterior of your home.
Are bay windows still in style?
Bay windows are a versatile architectural feature that can enhance a variety of home styles. They are commonly found in traditional, Victorian, colonial, craftsman and farmhouse homes, where they add character and elegance to the design.
What is the difference between a bay and bow window?
The main difference between bay and bow windows lies in the number of windows each has. Bay windows consist of three windows, typically two angled operable windows with one fixed inoperable picture window between. Bow windows are comprised of four or more windows of the same size and shape to create a more subtle curve than a bay window. To explore more of the differences between bay and bow windows, check out this article.
Can I replace a bow window with a bay window?
The structural differences may require adjustments to your framing or exterior siding. Consulting with a professional is advisable to ensure a proper fit and to address any potential changes needed for insulation, drainage or architectural compatibility.
Do bay windows increase home value?
Yes, bay windows can increase home value by adding both aesthetic appeal and functional space. Their classic design creates a focal point that helps enhance curb appeal, while the extra light and added interior space make rooms feel larger and more inviting. This combination of beauty and functionality can attract potential buyers and positively impact resale value.

Get windows ready to handle virtually anything life throws at them. Pella Impervia products are made from our proprietary fiberglass, the strongest material for windows.9
Pella’s exclusive fiberglass will never rot or corrode and resists dents, bends and breaks — and the list goes on. With a tough-as-nails powder-coat finish, your windows will never need to be painted or refinished.
Fiberglass Window Inspiration
Other Pella Impervia Products
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Pella® Impervia®
- Fiberglass
- Unmatched strength and lasting durability9
- Exceptionally energy efficient
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