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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

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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