Costco

Built For Life

Replacing your windows and doors is a once-in-a-lifetime investment and it should feel like it. That’s why Infinity by Marvin uses the unmatched strength of Ultrex® fiberglass to craft stunning, custom-fit windows and patio doors designed specifically for your home.

Installed by locally trained Infinity by Marvin window replacement professionals and protected by an outstanding productwarranty¹, your dream home starts here. Let’s make it a reality today.

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Strength, Durability, and Beauty – The Infinity Difference

Built to Last. Designed to Perform.

Our Ultrex® fiberglass is eight times stronger than vinyl and expands 87% less with temperature changes. That means your windows and doors stay tightly sealed—resisting leaks, stress cracks, and the wear that shortens performance and durability.

Style That Endures.

Infinity blends timeless design with exceptional durability. Enjoy elegant profiles, premium hardware, and a palette of rich, customizable colors. Our EverWood® finish offers the warm look of wood—without the maintenance. And thanks to the strength of Ultrex, you get slimmer frames, more glass, and expansive views that elevate any space.

Exceptional Value. Lifetime Confidence.

Replacing your windows and doors is a major investment—one you should only have to make once. That’s why Infinity offers an industry-leading Limited Lifetime Warranty, giving you lasting peace of mind. And as a Costco member, you’ll enjoy exclusive savings that make transforming your home more affordable than ever.

Getting Started Is Easy

Our local window and door specialists are here to help—ready to answer your questions, provide honest advice, and guide you to the perfect fit for your home and lifestyle.

1. Schedule your free in-home consultation

Give us a call at 1-888-462-2969 or click the Get Started button below to send us your info.

2. Chat with a local expert

An Infinity consultant will visit your home, answer your questions, and help you choose the right windows and doors.

3. Get a custom quote

We’ll take exact measurements and give you a detailed quote—no surprises.

4. Enjoy a smooth installation

Your consultant will handle the order and make sure everything’s installed just right.

Transform Your Home with Beautiful New Windows and Patio Doors

Replacing your windows and patio doors is an investment in your home’s comfort, safety, and style. That’s why every product we make is custom-built for your space—and built to last. Built for Life.

Windows in Every Size and Shape

Strength, durability, and expansive views are just the beginning. Infinity offers a wide range of design and finish options to complement—or completely refresh—your home’s unique character and architecture.

Patio Doors That Swing, Slide, and Fold

Discover where form meets function with anew Infinity patio door. Elevate your home's style with a wide selection of design options—across color, glass, and hardware—to create your ideal look.

Why Fiberglass?

Infinity’s proprietary Ultrex fiberglass is an unmatched combination of strength, beauty, durability, and stability in all climates.

Untrex vc Vinyl

Vinyl windows can warp and shift over time, making them hard to open and close and compromising their performance. Ultrex® resists sticking, swelling, and warping—so your windows and doors continue to operate smoothly for years.

Ultrex vs Wood

Wood windows provide a timeless, classic look but often require extra maintenance depending on the environment. Infinity’s EverWood® captures the beauty and detailed profiles of wood—without the upkeep.

Ultrex vs Other Composites

The Ultrex® fiberglass frame is exceptionally stable, expanding at nearly the same rate as the glass. In contrast, vinyl and wood/vinyl composites expand more than twice as much, which can impact energy efficiency and overall performance.

Explore Our Selection of Windows and Doors

Shapes, finishes, and features designed to fit your home—each crafted with the incredible strength and beauty of Ultrex® fiberglass.

Seethe Possibilities

From rich dark tones to light, modern finishes—and the warm look of wood without the maintenance—Infinity offers something special for every home, in every climate.