About Us

WI Home Improvement brings a wealth of specialized experience and a dedication to home performance done right. Our parent company, Wisconsin Insulation Services, was found in 1936, and purchased by John Ratzow in 1976. In 1984, he formed a separate company to focus on the growing market of home performance.

Top Construction Management Experience

In 2009, Ratzow brought Steve Kooi on board to manage the growing home performance business and add his construction management expertise to the mix. Steve worked as a construction project manager at NVR in Maryland, and most recently in the purchasing deparment for William Ryan Homes in Chicago. Steve holds a degree in construction management and business from University of Wisconsin-Stout. His hands-on experience in all types of construction provides our customers with proven solutions tailored to individual homes.

Home Performance Skills Teamed with Excellent Customer Service

Together, John and Steve have developed Wisconsin Home Improvement into a company that takes its responsibilities seriously. This business philosophy continues today:

  • Treat the whole house as a system. Your home's efficiency and comfort often rest on solving a combination of problems. Our trained and BPI certified technicians can identify these flaws by conducting a home performance audit.
  • Educate our customers about how their house works most efficiently. The results of a home energy audit are often quite revealing! We explain these results so that you understand the causes behind drafty rooms, high energy bills or musty smells.
  • No high-pressure sales, just great advice. Our expertise and training gives us the confidence to help you determine the best strategy for improving your home's energy efficiency. With our experience in retrofitting homes, we can provide standard, transparent pricing and an understanding of the process from beginning to completion.
  • Trustworthy and responsive service. We pride ourselves on our honest and straightforward approach to home performance. If you have a problem or a question, we have a prompt response. Our call center is operated until 7:00PM and we often answer email requests in off hours.

How does your home perform? Learn more about how our team can help improve your energy efficiency and comfort -- call us today!

Top-quality home performance services.

Contact our team today to learn more!

262.345.9922

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  • I just wanted to take a minute to thank you and your Madison crew for the great work they are doing. Over the last few months I have worked closely with Dann, Roger, Marc and Jeremy and am extremely impressed with their attitudes and the quality of their work.

    Brandon Langeteig, Project Home, Inc.
  • We were pleased with work done by Mike and Kevin. They deserve a pat on the back. Thanks!

    Eugene Hefter, WI
  • Steve and Frank are very good representations of your firm -- very professional. Thanks!

    Jim Young, WI
  • The work your team did is fantastic! Also I would like to compliment your crew on their professional approach to our house and their work.

    Ryan, WI
  • Jan and I were amazed and impressed by the crew’s positive work ethic coupled with their gracious and friendly manner. Obviously they knew what they were doing and set to task with quickness and absolute thoroughness… you have our deepest appreciation.

    JoAnne and Jan V., Greendale, WI
  • Please thank your crew for the great job they did here. They were all very personable, worked very hard, and they took the time to explain what they were doing.

    Barbara F., Belgium, WI
  • Thursday and Friday of last week one of your crews were at my home putting in some additional insulation and doing some other work. I just wanted to tell you that my wife and I were very impressed with the professionalism of your men.

    John & Jennifer P., WI
  • Your employees were prompt, courteous and friendly.

    Lois W., Menomonee Falls, WI
  • I wanted to thank you and your team again for the
    great work you did and insulating our home. It is only been a week, and the
    difference is amazing. Every room in this house feel substantially warmer.

  • Mike & Erin M.

    We wanted to provide feedback on our experience with Peter, who did our home energy audit.  We felt he went above and beyond what was expected of him.  He was very thorough and was genuinely concerned about any issues causing inefficiencies in our home.  He explained things i

  • Tim S.

    Steve, just a side note and I would not send this if it was not completely true - Mike and Pete were both fantastic. I was impressed. We had just had other major construction and have many comparatives for the work WHI did. I would come home and never know they had even been there.