Infinity from Marvin Fiberglass Replacement Windows in Green Bay and Appleton, WI
Retail Partner

We Value Your Time!

Tired of pushy sales representatives and their lengthy in-home appointments? Don’t worry, we value your time! This is the perfect way to get started and learn about all the options available to you.

Come see our huge showroom

We Can Match Any Color

Replacement Window Specialists

Serving Green Bay and Appleton Areas

Certified Master Installer Carl Hardtke has locally owned Windows Of Wisconsin for over 22 years. As a Master Installer, Carl knows what it takes to get the job done right. He personally works with and trains his staff to ensure that you get the best service possible.

We have the largest variety of windows to choose from, the latest developments in window technology and personalized service that can’t be beaten. All of our windows are backed by excellent warranties from their manufacturers. We are so confident in our work that we guarantee our workmanship for as long as you live in your home.

118+ Reviews!

Our Appointment Options

Visit Our Showroom

Schedule an appointment today to stop in and learn more about the windows we have to offer. See demonstrations and speak to our knowledgeable staff who will help you make the best decision.

Schedule an In Home Appointment

Not only will we come to your home for an estimate, saving you time, but we will also provide a handwritten quote so you understand exactly what your home needs.

Is Your Time Limited?

Schedule an express appointment to quickly get to know us and our products. We value your time and want to utilize it as efficiently as possible.

What Our Customers Are Saying

The sales pitch was low key, the price was acceptable, the windows came in early. The installation process took only 3 hours, the area was vacuumed clean before the men left.
Tracy Farley

Green Bay, WI

Beautiful windows and doors, awesome crew-these guys work like a well-oiled machine!! They were efficient, fast and did beautiful work! Also cleaned up everything!!
Amy & David Stern

Manawa, WI

Product is outstanding and installation was perfect! Couldn’t be happier with how the windows and patio door look. Install crew was outstanding and everything looks even better than expected.
Mark Nooyen

Hobart, WI

I liked several key points from Windows of Wisconsin including Professional sales advice, top-notch products, exclusive fiberglass windows of excellent craftsmanship. Installation was efficient.

Green Bay, WI

118+ Reviews!

Our Product Offerings

Windows Of Wisconsin offers the largest selection of replacement windows and uses the best installation processes in the Appleton and Green Bay areas. We have invested countless hours securing and maintaining relationships with the best window manufacturers to ensure that you have the absolute best collection of windows to choose from.

Ultrex Fiberglass

We are proud to offer premium windows from Marvin. Built with top of the line materials and designed with elegance, these are the windows your neighbors will envy.


Vinyl Windows

The Soft-Lite elements Triple Pane is the most efficient window and will do the best job of keeping the elements at bay. Upgrade the appearance of your home and save $$ on energy costs.


Custom Windows

We have custom windows manufactured right here in Wisconsin. High-quality windows for Wisconsinites, made by Wisconsinites.


Let's Get Started

With many flexible appointment options, great special offers available right now, and an abundance of replacement window solutions to choose from now is a great time to get started. We are happy to answer any questions or concerns you have and will always go that extra mile to make you, the valued customer, happy!

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