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The Best Replacement
Windows for Your NE
Wisconsin Home

• Narrowest & Strongest Frame in the Industry
• Energy Efficient Windows Certified by ENERGY STAR®
• Certified Master Installers on EVERY job
• Trusted Infinity from Marvin Partner for 15 years

Fiberglass Replacement Windows in Green Bay and Appleton, WI

Ultrex® Fiberglass

Outperforms Vinyl and Wood

Get more for your money with our fade-resistant and maintenance-free replacement windows.

Learn About Ultrex

Infinity from Marvin

Built for Life

Windows of Wisconsin is extremely proud to offer Infinity from Marvin replacement windows.

Get To Know Our Brand

Award Winning

Replacement Window Installation

Windows of Wisconsin prides itself on quality craftsmanship and has an award winning team.

See What Makes Us Different

Replacement Window Showroom

Off Hwy 41 in Kaukauna

Visit the largest replacement window showroom in Northeast Wisconsin.

Tour Our Showroom

Fiberglass Replacement Windows in Green Bay and Appleton, WI

Ultrex® Fiberglass

Outperforms Vinyl and Wood

Get more for your money with our fade-resistant and maintenance-free replacement windows.

Learn About Ultrex

Infinity from Marvin

Built for Life

Windows of Wisconsin is extremely proud to offer Infinity from Marvin replacement windows.

Get To Know Our Brand

Award Winning

Replacement Window Installation

Windows of Wisconsin prides itself on quality craftsmanship and has an award winning team.

See What Makes Us Different

Replacement Window Showroom

Off Hwy 41 in Kaukauna

Visit the largest replacement window showroom in Northeast Wisconsin.

Tour Our Showroom

Replacement Windows Reviews from Homeowners Like You

Great team fro the salesman to the office to the installation team. Great group of professionals to work with.
Richard S.
June 13, 2023
We would recommend Matt Gonwa and Windows of Wisconsin to anyone looking to replace windows! Matt is knowledgeable and dedicated to customer satisfaction. The installation team was courteous, attentive to detail, and completely professional. The windows themselves are of excellent quality and easy to clean and maintain. A much better overall experience than we had with Pella!
Amy Cook
June 11, 2023
We have used WOW for some previous work and when it came time to finish replacing the rest of the windows in the house we new who to call. From Marshall our salesmen to the installers and even the office staff keeping us informed we have been very satisfied and would not hesitate to recommend them to any one.
Sue Seyler
June 6, 2023
Very professional and good price/value. They kept us informed during the process. The installers were courteous and meticulous. They wanted everything perfect which is how it turned out. Would definitely recommend.
Patrick Hawley
May 31, 2023
What a great experience for a major home purchase! From the first meeting with the sales person Tom through the installation and inspection the WoW team made sure we were happy with the product and installation. We were perhaps the first customer to ask for black sills and there were some issues matching the touch up paint sheen. They went back to the shop to work on a solution to the problem and then sent their top notch installers to work through the problem at our house and gave us options to ensure we were happy with the results. Corey and Sean did a great job as well as the rest of the team! It's difficult to find a company out there that works tirelessly to make sure the customer experience is second to none, but Windows of Wisconsin definitely falls into this category!
Julie Brunner
April 30, 2023
Was an excellent install as promised, worked with my schedule and did very good quality work. Always on time and would highly recommend them for your window replacement needs.
John Samorske
April 24, 2023
We are replacing the cheap windows that were installed in our house when it was built 11 years ago. We met with Thom Kohlbeck last fall to discuss our window project. Thom was very informative and answered all of our questions and got us pricing on replacement windows for the whole house. Absolutely NO high pressure!! Which was very refreshing after the experience we had two other window suppliers. We decided to split the project in 2 phases. So we had the sliding patio door and the 5 windows on the front of the house done on 4/10, and we will do the rest of the 12 windows in 2024. The crew at WOW followed the exact process that Thom said they would. We supplied them with a piece of window mounding and they supplied us a sample to show the color match. As promised, the installation date was set up after they received the windows. Our installation crew consisted of Kris, Jeremia & Adam. What a great group of guys to work with! We explained our concerns about being able to use our window blinds with the new windows and they said they would take care it. They covered the floors and removed our blinds. They took great care when they removed the old windows, keeping all the “mess” outside. It was fun watching them work. Very meticulous. They taped each opening, leveled windows, foam insulated inside and out, cased and jammed each window and even rehung our blinds! After they cleaned up, they showed us how the windows operated. We immediately noticed how much quieter it was in the front of the house. We’re anxious to see how they perform this winter. If all goes according to plan, we will have the rest of the windows replaced in 2024. When doing a project involving a significant amount of $$’s it can be a big concern. So far, It’s been a very good experience.
Steve Lewins
April 22, 2023
We had all of the windows and 2 sliding doors replaced in our built-in-1986 home with Infinity by Marvin products. The windows/doors are beautiful and so much easier to use than our old ones. Alex H’s crew was extremely professional and hard working: they were short-handed for a couple of days (who isn’t short-handed these days?) and still managed to get through everything during the original estimated timeframe. Alex made sure I was informed and brought decisions to me in a clear and concise manner. Everything looks great, thank you Alex and team! The sales experience was so much better than the experience we had with Pella: Marshall walked us through our options, made recommendations, and answered our questions—just the kind of no pressure, no gimmicks experience I expect from a great Midwestern company. The communication of the scheduling of our installation could have been better, but the overall experience is still worthy of 5 stars!
Cassandra Brill
April 22, 2023
Special thanks to Marshall and Chris' installation crew!
Lee Hanagan
April 20, 2023

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

Replacement Windows Are Color Matched to Match Existing Trim PRIOR to INSTALLATION!

Unlike other replacement window companies Windows of Wisconsin color matches our Infinity from Marvin replacement windows to match the existing trim in your home. After consulting with the homeowner our expert stain matching team formulates the perfect color at our facilities which will maintain the beauty and continuity of the woodwork in your house. A sample of the custom formulated stains are approved by the homeowner and applied to the windows prior to installation. This ensures a hassle free and no fuss process that eliminates follow up visits and third party painters. Once your windows are installed you can enjoy the appearance and superior performance of the engineered EverWood interior woodgrain finish.

Proudly Serving Northeast Wisconsin

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