The Premier Window Contractor Serving the Tri-Valley and East Bay Area

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Upgrade Your Home With Stronger, More Efficient Windows. Installed by Local Experts

If you’re considering replacing your windows, fiberglass windows offer one of the best long-term investments for Bay Area homeowners. At Custom Exteriors, we install premium fiberglass replacement windows designed to handle coastal moisture, inland heat, and everything in between, without sacrificing style or energy efficiency.

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Why Choose Fiberglass Windows?

Exceptional Durability – Stronger than vinyl, resistant to warping, cracking, and expansion.‍
Energy Efficiency - Maintains a tight seal year-round for improved indoor comfort. ‍
Low Maintenance – No peeling, rotting, or frequent repainting‍

Sleek, Modern Profiles - More glass, slimmer frames, and clean architectural lines.
‍Long-Term Value - Designed to last decades with minimal upkeep

Unmatched warranties – We will stand behind your new windows with an unbeatable labor warranty, in addition to the manufacturer’s warranty, so you can have total peace of mind.

Fiberglass frames expand and contract at nearly the same rate as glass, which helps prevent seal failure and air leaks over time.

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Designed for Bay Area Living

From foggy coastal mornings to hot East Bay afternoons, fiberglass windows are built to perform consistently in changing conditions.

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Our team helps you choose the right configuration based on:

Sun exposure and orientation
Energy efficiency goals
Architectural style (modern, contemporary, traditional)
Noise reduction and comfort needs

Every recommendation is tailored—never one-size-fits-all.

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A Smarter Alternative to Vinyl or Wood

Not sure if fiberglass is right for you? We’ll walk you through the differences so you can make a confident decision.

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Fiberglass vs. Vinyl

Stronger frames
Better temperature stability
More refined appearance

Fiberglass vs Wood

No rot or moisture issues
Far less maintenance
Modern performance with classic style options

For more information, and to get started on your project, contact Custom Exteriors, Inc. today!

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Up to 20% Off
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There’s never been a better time to get the windows you’ve always wanted.

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Check out our rave reviews!

What Our Clients Are Saying

"Loved working with Custom Exteriors. Very responsive to inquiries. Precise in their measurements, estimate and timeframe for completion. Highly recommend them."

Brian I.

"We needed to replace 5 windows in our house, and after receiving a couple quotes it was an obvious choice to go with Custom Exteriors. Robert was knowledgable and thorough in his initial visit, and was able to explain the entire process exactly as it played out. Thanks to Toni & Cesar for their follow ups and professionalism as well. Jose and the installation crew did an excellent job, worked very efficiently and left things looking great. The project couldn’t have been smoother from start to finish. Any issues, questions or concerns were promptly answered/cleared up by Robert, and the staff had great customer service attitude all around. Highly recommended for any job!"

Clyde L.

"Love my new double-paned windows. I was so pleased with the work from this company a few years ago that I had them back. The workmen arrived on time, did a beautiful job, and left everything in perfect condition. The windows and door open so easily and the look is amazing. I should have done this sooner! Thank you for this great job!"

Kerin B.

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