An infinity from Marvin bi-fold door in a living room.

Transform your home

Fiberglass replacement patio doors by Infinity by Marvin

Update your existing patio doors or completely reimagine and expand your indoor-outdoor spaces with full-frame replacement combined with the engineered strength of Ultrex^® fiberglass. Available only from Infinity.

Why Infinity Replacement Process

Bi-Fold door

Designed for true indoor-outdoor living with configurations up to 22-feet wide.

Sliding french door

Classic design with effortless sliding provides more expansive views.

Sliding patio door

Sleek profile with compact operation expands your space and fills your room with light.

Swinging french door

Choose from inswing or outswing operation paired with a timeless look and wider profile.

The promise of Ultrex

Why Ultrex

8x
stronger

Built for a lifetime

100% fiberglass Ultrex material is 8x stronger than vinyl and 3x stronger than Fibrex^®. It's strength we stand behind with a Limited Lifetime Warranty.

Fibrex^® is a registered trademark of Andersen Corporation.

3x thicker
finish

Smooth, durable, lasting

Thicker than others available, our proprietary acrylic finish provides an elegant polish that stands the test of time and resists fading, denting, or scratching.

17 tons
per inch

Uncompromising views

Supporting up to 17 U.S. tons per square inch, Ultrex allows us to craft patio doors up to 8 feet high with configurations up to 22 feet wide for more expansive, uninterrupted views.

Withstands
285° F

True comfort, year round

Even when exposed to extreme temperatures up to 285° F, Ultrex won't melt or warp. This, paired with an expansion rate that stays true to your glass panes, keeps drafts out, so your home stays comfortable for years to come.

We took an entire wall out in our living room and replaced it with a 16-foot patio door opening out to our deck. We decided to go with Infinity by Marvin because we wanted a fiberglass window in a black exterior and liked the overall look and thin frames."

Jon H.

Ohio Homeowner

Amman opening a sliding Infinity patio door.

Features and options

Custom built for your home

Because Infinity by Marvin patio doors are installed with full-frame replacement, you have complete control over every inch of your design. Each door is built to order with choices like grille and divided lite patterns, 9 hardware options, and added security features.

Our range of finishes includes EverWood^® interiors that look and feel like traditional wood. And all are 100% paintable while staying covered under our Limited Lifetime Warranty.

Explore Options

A perfect match

Designed to complement our line of windows, Infinity patio doors complete your replacement project with a beautiful, cohesive look.

View the Gallery

A bi-fold door in a living room of a home.

Bi-Fold door Interior color: Stone white

The exterior of a home with an Infinity from Marvin sliding french door.

Sliding french door Exterior color: Ebony

A closeup photo of an Infinity from Marvin door handle hardware.

Sliding patio door Exterior color: Ebony

A patio featuring an open Infinity from Marvin sliding patio door.