Fiberglass Replacement Windows and Doors

Replacement window installation - Infinity by Marvin

A blonde couple holds their child on the lawn in front of their house.

A family sitting together out in their front lawn.

Infinity by Marvin

Your experts in window and door replacement

A white kitchen with Infinity from Marvin windows.

We make it easy to understand the process of replacing your windows and patio doors. So you can start enjoying superior comfort, broader views, and greater peace of mind. For a lifetime.

The promise of Infinity

Strength, beauty, and comfort — times a lifetime

Why Infinity

Strength, maximized

Built with our proprietary Ultrex^® fiberglass, Infinity windows bring unmatched strength and confidence to your replacement process.

Extraordinary views, from the outside in

Slim profiles paired with smooth, long-lasting finishes and optional EverWood^® interiors ensure your window frames are as beautiful as the sweeping views they deliver.

Designed for your life

Thoughtful details like easy inside-out cleaning options and innovative weatherstripping keep maintenance effortless and ensure your home stays comfortable.

Lasting investment

Engineered to reduce energy costs and backed by 110+ years of Marvin quality and a Limited Lifetime Warranty, Infinity windows are an investment you won't regret.

A close up of a window letting light into the room with a chair and a pair of glasses on an end table.

Power of Numbers

From ordinary to extraordinary

Ultrex is 8x stronger than vinyl

Millions of fiberglass strands lend strength to your windows for slimmer profiles and broader views.

Acrylic finish is 3x thicker compared to the competition

Our proprietary finish provides a cleaner, smoother look that resists fading — even with the darkest colors.

Get inspired

Explore the beauty of Infinity

Visit the Gallery

An Infinity from Marvin swinging french door shown from the exterior view of a home.

Swinging French Door Exterior color: Stone White

A Infinity from Marvin bifold door partially opened leading to a covered patio.

Bi-Fold Door Exterior color: Pebble Gray

An exterior view of a dormer with Infinity windows.

Single Hung Round Top Window Exterior color: Bahama Brown

A pool house with Infinity from Marvin windows.

Casement Window Exterior color: Bronze

Gorgeous windows! 100% satisfied! Made our hot and very sunny kitchen just sunny and bright. We don’t feel the heat from the sun anymore! So very efficient as well as beautiful."

Floyd & Melinda E.

Wisconsin Homeowners

All reviews

Replacement window project

Transforming an Ohio home into a treehouse retreat

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Before

After

Your questions answered

Plan your replacement with confidence

Visit Resource Hub

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An Infinity windows installer places an arch window in a brick home.

Window Installation Process

We’ll share helpful information on the replacement window installation process, including tips for a successful and stress-free upgrade.

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An older couple sit on a couch and talk to each other.

How Much Should Replacement Windows Cost?

There are many different variables that can affect the overall cost of your window or door replacement project.

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Backyard view of a white home exterior with scaffolding in front of windows during window installation..

Can I Install Replacement Windows Myself?

Why one DIY expert decided not to DIY replacement windows for her home.

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The after photo of a newly installed Infinity from Marvin awning window in a kitchen.

A Window Replacement Makeover

Transforming an Ohio home into a treehouse retreat with Infinity by Marvin fiberglass replacement windows.

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Interior view of Chuck's Lakeshore Inn upstairs dining room.

The Perfect Solution for a Historic, Lakeshore Renovation

The property dates back to 1891 but after a fire in 1987, the owners rebuilt the restaurant to preserve its mid-century charm with white siding and wood casement windows.

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Exterior view of a deck with an opened black four-panel patio door.

Ohio Home Transformation

An Ohio family recently replaced the builder-grade, vinyl windows in their 12-year-old home with new, Infinity by Marvin fiberglass windows.

Infinity by Marvin

Your experts in window and door replacement

We make it easy to understand the process of replacing your windows and patio doors. So you can start enjoying superior comfort, broader views, and greater peace of mind. For a lifetime.

The promise of Infinity