25% OFF 3+ WINDOWS PLUS 6.99% APR FINANCING AVAILABLE

TRUSTED WINDOW & DOOR REPLACEMENT COMPANY IN WISCONSIN

Locally owned. LoCally Operated. Locally Trusted.

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Why Choose Windows of Wisconsin for Window Replacement

Infinity by Marvin windows are made of Ultrex® fiberglass, which is 8x stronger than vinyl and 3x stronger than Renewal by Andersen Fibrex. With a finish that’s 3x thicker than competitive options, Ultrex resists chipping, denting, or peeling.

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Because Ultrex is so strong, we actually use less of it in the window frames. That means you get more daylight and greater views outside without bulky frames getting in the way.

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Enjoy beautifully crafted fiberglass windows with your choice of style, grilles, hardware, and exterior color. Infinity windows and doors have a superior finish that outlasts all the competition. Infinity’s patented, mechanically bonded finish is up to 3 times thicker than competitive finishes and provides superior resistance to scratching and UV degradation, even on darker colors.

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Unlike other replacement window companies, Windows of Wisconsin color matches our Infinity by Marvin replacement windows to match the existing trim in your home. Everwood®, our breakthrough engineered wood grain interior finish, offers natural looks and textures combined with the durability you expect from Infinity. It looks, feels, paints and stains like wood but is completely low maintenance. The Everwood fiberglass is prefinished to match your existing trim color.

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You’ll see the difference that friendly, experienced, honest people and quality replacement windows can make.

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We are a Diamond Level Partner with Infinity by Marvin and a true single-source solution: Windows of Wisconsin installers, wood shop, stain shop, and service department. With a focus on customer satisfaction, we don’t sell windows to just sell windows. We sell windows to solve problems and give our customers the service they expect and deserve.

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What Our Window Replacement Customers Say

WOW Feature Project

STURGEON BAY PROJECT

Tucked away on a quiet peninsula in Sturgeon Bay, WI, the homeowner envisioned a space filled with natural light and a seamless connection to the outdoors, so Windows of Wisconsin designed and installed large, custom floor-to-ceiling windows that showcase the bay like a living painting while their energy-efficient, low-profile frames keep comfort and sustainability in focus. The result is a stunning remodel where every room glows with daylight and every view captures the beauty of Green Bay and Lake Michigan.

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Windows of Wisconsin | Family-Owned Window Experts Since 1997

For generations, the Hardtke name has been part of Northeast Wisconsin construction. Dating back to the 1950s, Hardtke Construction helped shape homes throughout the Green Bay area, building with pride, precision, and craftsmanship that still stands today. That legacy continues through Windows of Wisconsin. Founded in 1997 by Certified Master Window Installer Carl Hardtke, the company was built on the same values: quality workmanship, honest service, and doing the job right the first time.

Today, as a locally owned and operated company, Windows of Wisconsin carries that tradition forward, combining strong construction roots with modern innovation. Partnering with Marvin, we proudly offer Infinity replacement windows, delivering durability, energy efficiency, and lasting beauty. When you visit our showroom, you’ll experience the difference generations of expertise make. Our knowledgeable, no-pressure team will guide you through products, custom color matching, and professional installation, helping you make confident decisions.

From homes built in the 1950s to those we enhance today, our mission remains the same: lasting quality you can see and trust.

(Pictured: The Hardtke Construction family in front of a newly completed Green Bay home, circa 1950.)

History by Marvin

For more than 100 years, Marvin Windows and Doors has been a family-owned and operated company dedicated to helping people live better in their homes. Founded in 1912 in Warroad, Minnesota, Marvin began as a lumber business and has grown into a nationally recognized leader in premium window and door manufacturing, built on craftsmanship, innovation, and integrity.

Today, Marvin is guided by fourth-generation family leadership, continuing a legacy rooted in quality, care, and doing things the right way, maintaining its reputation for innovation while honoring its original values.

In 2002, Marvin introduced Infinity® by Marvin, a line of replacement windows and doors designed for existing homes, bringing Marvin’s century of craftsmanship into the replacement market for homeowners upgrading without new construction.

At the core of Infinity is proprietary Ultrex® fiberglass, engineered for strength, durability, and low maintenance, outperforming traditional vinyl with lasting performance and a timeless finish.

Through trusted partners like Windows of Wisconsin, Infinity by Marvin delivers a replacement experience, combining expert installation with products backed by over a century of innovation and family values.

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Choose your PERFECT WINDOW!

Double Hung

Offers two window sashes that move up and down for more ventilation

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Single Hung Round Top

The beauty of a round top with effortless sliding operation

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Slider

Smooth rolling operation allows you to easily slide open from side-to-side

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Casement

Offers maximum views with a slimmer profile and a frame that swings outwards to invite more of the outdoors in

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Awning

Hinged on top of the frame to swing outward — perfect for a tight spot

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Bay

Built to capture light from three angles and can vary in size from big sunlit areas to a small, cozy reading nook

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Bow

Use a gentle curve built to capture light from multiple angles and completely open up a room

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Special Shape

Create additional decorative touches for your home — or complement existing windows and doors

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Round Top

Add abundant natural light and visual interest to your home Use a gentle curve built to capture light from multiple angles and completely open up a room

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