Fiberglass Windows

Beautiful, lasting Infinity from Marvin fiberglass windows for your Bay Area and Marin County home.

When it comes to replacement windows, fiberglass windows from Infinity from Marvin offer an unbeatable combination of value, beauty, and low-maintenance upkeep. Unlike traditional windows made from wood or vinyl, fiberglass windows are virtually maintenance-free and won't warp, rot, or crack over time. They're also energy-efficient, helping you to keep your energy bills low all year round. And for those sticky summer days when other windows get hard to open, fiberglass windows stay smooth and easy to operate. If you're ready to invest in replacement windows that will offer years of trouble-free performance, fiberglass windows from Infinity from Marvin by Charles Windows and Doors are the perfect choice.

The Infinity Fiberglass Window Advantage

At Charles Windows and Doors, we understand that not all homes are the same. That's why we offer a wide range of fiberglass windows to choose from. And no matter what type of window you select, you can rest assured that it will be installed by a qualified technician. Our installers are experienced in all aspects of window installation, and they're equipped with the tools and materials needed to guarantee perfect fit and function. So if you're looking for a company that can provide the perfect window for your home, look no further than Charles Windows and Doors.

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The Infinity Fiberglass Window Advantage

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Ultrex Fiberglass Outperforms Vinyl & Wood

We created Ultrex with one goal in mind: develop the most durable window material in the industry. It’s not only 8 times stronger than vinyl — it resists expanding and contracting in any climate. So you get a tight, snug fit that will last.

Ultrex vs. Vinyl Windows

Vinyl can warp and shift under everyday conditions — potentially making vinyl windows difficult to open and close and affecting their all-around performance. Ultrex resists sticking, swelling and warping so Infinity windows and doors will continue to easily open and close.

Ultrex vs. Vinyl Windows

Ultrex vs. Wood Windows

Wood windows offer classic beauty that, depending on the environment, can require maintenance and care. Infinity windows capture the beautiful details and profiles of wood - without the maintenance.

Ultrex vs. Wood Windows

Wood windows offer classic beauty that, depending on the environment, can require maintenance and care. Infinity windows capture the beautiful details and profiles of wood - without the maintenance.

Ultrex® Fiberglass Delivers Lasting Performance

Expands 87% less than vinyl – resists expanding and contracting in any climate
8 time stronger than vinyl – protects the integrity of your home
Resistant to leaks, seal failures and stress cracks – all things that can affect energy efficiency
An average 68-72% return on investment – ranks higher than most interior renovations

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Unique Design That Withstands The Test Of Time

We offer a complete collection of styles, features and options to complement any home
All products feature narrow profiles for expanded views and more daylight
Fiberglass has a longer useful life expectancy than vinyl
Our proprietary acrylic finish is fade-resistant and virtually maintenance-free

infinity by Marvin replacement inspiration guide

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Unique Design That Withstands The Test Of Time

We offer a complete collection of styles, features and options to complement any home
All products feature narrow profiles for expanded views and more daylight
Fiberglass has a longer useful life expectancy than vinyl
Our proprietary acrylic finish is fade-resistant and virtually maintenance-free

Download Catalog

Replacement Window Options

If so, it's crucial to choose a contractor that has experience installing Infinity from Marvin fiberglass windows to guarantee a top-quality replacement. If so, it's crucial to choose a contractor that has experience installing Infinity from Marvin fiberglass windows to guarantee a top-quality replacement.