Window Replacement to transform your home.

0% Interest 5 Years

Plus 10% Off Infinity From Marvin Windows!

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

Windows of Wisconsin
4.8
Based on 166 reviews
powered by Google
Cody Schichtl
Cody Schichtl
18:24 29 Feb 24
Elena Kornis
Elena Kornis
15:07 29 Feb 24
We had a fantastic experience with Windows of Wisconsin. Patrick, our salesman, was extremely knowledgeable and patient in answering our questions and offering different options. There were no high pressure sales tactics so you can take the time you need to make decisions. The installation team also did a wonderful job (professional, on time, good communication) and we are very happy with our Marvin Infinity windows (high quality, good value). Highly recommend Windows of Wisconsin to anyone looking for replacement windows.
thomas franklin
thomas franklin
16:13 01 Feb 24
I had a friend who had used WOW and was very satisfied. I too had the same experience. The job was completed in a short time frame, and I had many windows. The crew did great work, and very careful of my inside house. The windows are outstanding, and less costly then Andersen Co. Tom Franklin
Bruce Lands
Bruce Lands
16:13 24 Jan 24
Great people, awesome company
Ronald Perz
Ronald Perz
19:57 31 Dec 23
We chose Window of Wisconsin because they offered the Marvin the Marvin line of windows. These able to be stained to match your existing woodwork. Matt Gonwa was very helpful in explaining the product and the installation. We got a call 3 days before Christmas letting us know the product was ready for installation and a spot was available the next day for the work to be done. The installers were here at 8:30AM and were done installing our 4 section 9’x5’ casement window by 11:00. We would definitely recommend them!
Ken O.
Ken O.
03:04 29 Dec 23
Our experience with Windows of Wisconsin has been absolutely superb. Marshall Wittman (Sales Rep) was very knowledgeable. The installation team was respectful, and cleaned up after themselves. Marshall came back out and noticed a couple of adjustments that needed to be made that I didn't even notice, and is having a technician stop back out. All in all, we would definitely call Windows of Wisconsin again.
Mathew Hodapp
Mathew Hodapp
15:16 12 Sep 23
From the salesman (Thom Kohlbeck) to the installation team (Jerry, Alex, Kris & Justin), my wife and I were extremely happy and satisfied with the window, price and service. Windows of Wisconsin (WOW) offered the best quality, price and all-around professionalism that could not be beaten!!!You will not be disappointed when you choose WOW!!!
Andrew Taber
Andrew Taber
14:54 30 Aug 23
Excellent experience from start to finish. We had Thom set up the install and provided us with very good installers. Adam, Alex and Glen were our installers. They were on time, courteous and professional. Their work was superb.
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