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Clearly different. Clearly better.

You’ll see the difference that friendly, honest people and quality Infinity® from Marvin® replacement windows can make.

We streamline your replacement project — from start to finish.

8x stronger than vinyl

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.

More view for your money

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.

A finish that lasts

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.

Manufacturer—direct installation retailer

We are a Diamond Level Partner with Infinity from 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.

Replacement Window Specialists

Windows of Wisconsin has been locally owned and operated since 1997 by Certified Master Window Installer Carl Hardtke. The Hardtke family has a long and reputable history in the local Green Bay area construction industry.

Award Winning
Top 500 Remodeler

Reliable Service
Highly Rated

Window Showroom
Largest in NE Wisconsin

Expert Installers
Experienced and Trained

  • Fox Cities
  • Appleton
  • Kaukauna
  • Oshkosh
  • Green Bay
  • De Pere
  • Manitowoc
  • Kohler
  • Stevens Point
  • Oconto
  • Shawano
  • Door County
  • Sturgeon Bay
  • Sister Bay
  • And More!

Replacement Windows Reviews from Homeowners Like You

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

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