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Comparing Fiberglass vs. Wood Windows

Comparing Fiberglass vs. Wood Windows

Whether your client has a modern or traditional home, wood and fiberglass windows are a stunning addition. Learn about the differences so you can help them choose between the two materials.

Architectural Style

When deciding between fiberglass and wood windows, it’s smart to consider your project’s architectural style.


Steel windows are often preferred for contemporary homes, but they also include a high price tag. You can create a similar look with Pella® Impervia® fiberglass windows, which feature sleek profiles and clean lines. They’re available in an attractive color palette that includes black. With optional between-the-glass grilles and complementary hardware, you’ll be able toaccomplish your design vision.

Have a client who enjoys the beauty and warmth of wood? There’s a modern window for them in either the Pella® Reserve™ or Pella Architect Series® collection. These windows feature expansive glass and minimalist finishes.


Wood windows are a classic style for traditional homes. When your clients want something highly customizable, Pella® Lifestyle Series is a great fit. These windows deliver style flexibility plus exceptional performance options and 37 time-tested purposeful innovations.

When you have a client who wants wood windows that stand out, there’s the traditional Pella Architect Series. These windows feature finely detailed grilles and sashes, timeless style and the best limited lifetime warranty for wood windows.1


Wood is a premium window material. While cost can vary depending on your specific project, wood windows are typically more expensive than fiberglass.


From grilles to hardware and glass options, both fiberglass and wood windows can be extensively customized. However, there are several more extra features available for wood windows, including our integrated blinds and shades in Pella Lifestyle Series. These window treatments are tucked between the glass, which keeps them away from fingerprints and allergens.

Energy Efficiency

Wood windows are particularly energy efficient. In fact, our Pella Lifestyle Series windows are manufactured in styles that meet or exceed ENERGY STAR® guidelines in all 50 states.3 Your clients can customize their energy efficiency with glass windows like triple panes or dual panes with insulating argon gas.

Fiberglass won’t expand or contract as temperatures change, so the frame isn’t susceptible to cracking or gapping. Your clients can also customize it with energy-efficient dual and triple-pane glass options with argon to slow heat transfer.


Fiberglass is an extremely long lasting material. It won’t rot or corrode, and it naturally resists water and bugs. Impervia windows have been tested in -40oF to 180oF and meet strict performance requirements for commercial buildings.2

Wood windows have stood the test of time, as they’ve been used for hundreds of years. We treat ours with the exclusive EnduraGuard® formula, which delivers strong protection on every surface. Then, we finish them with strong extruded aluminum or aluminum cladding to preserve the exterior.


Fiberglass windows are the lowest-maintenance option. Impervia is finished using a heavy-duty powder coat finish that stands up to chipping, chalking and fading. These windows won’t ever need to be painted or refinished.

The outside of our wood windows is protected with extruded aluminum or aluminum cladding, depending on the product line your clients choose. This greatly reduces the upkeep they’ll need to do. For the interior side of the window, they can decide between factory-prefinished stains and paints, or stain and paint the windows themselves.

Partner with Us on Your Window Project

Whether your project involves replacement windows or custom windows for new construction, the pros at Pella of Casper can turn your dream into a reality. We understand it’s not just your project on the line. It’s also your name and reputation. Call us at 307-234-1518 or stop by our showroom to get your free quote today.

1Based on comparing written limited warranties of leading national wood window and wood patio door brands. See Pella written Limited Warranty for details, including exceptions and limitations, at or contact Pella Customer Service at 877-473-5527.

2Pella Impervia windows and patio doors have a performance grade of LC or higher. For information on product ratings see

3Some Pella products may not meet ENERGY STAR® guidelines in Canada. For more information, contact your local Pella sales representative or go to

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