A locally owned family business serving the Madison area since 1976.


THEBCO is a locally-owned business serving the Madison area since 1976. We specialize in window and siding replacement, entry and patio door installation throughout the Dane County area. 

We offer excellent customer service and warranty on our products and services. We are experienced in residential and commercial installation. All of our employees take pride in the quality of our services and customer satisfaction.

We guarantee great customer service and product quality. We will respect your time, your budget and your decision.  Call today for your no-obligation in-home estimate!



We make it our mission to always do what’s right for our customers, even when many other contractors will not. That’s why we use only superior-quality materials and elite craftsmanship. And that’s why we always ensure your complete satisfaction with your project before we even think of considering the job done.

We have perfected our installation methods so well after all these years, that our customers marvel at how “painless” the entire remodeling process is. See for yourself by checking our reviews. The crews working on your home are the most qualified and professional installers in the business. We always show up on time and never leave a mess behind.


Thebco Google Rating
  • Very happy with our whole project - short wait for windows - fast installation, excellent installers and beautiful window! Thank you.

    T. Ryan
  • We are so happy with our replacement windows and our new entry way.

  • Our sales person did a great job explaining everything to us. He is the reason we went with Thebco. Thanks so much!

    J. Tung
  • Thanks you for a wonderful job! Our installer did an excellent job - what a hard worker! I’d recommend you folks to anyone!

    C. May
  • Very neat, professional job. It makes me feel that my money was well spent. Clean up and detail was extremely professional.

    L. Frish
  • Excellent job! We’re looking forward to using your services in the future!

    S. Rowels
  • Again we were very satisfied with the quality of the product, the workmanship, the convenient schedule of installation. We’ll keep on recommending you in the future!

    M. Rotenberg
  • With the new replacement windows, we could reduce our heat from 75º to 70º and feel very comfortable in these winter days.

    M. Welp
  • I am so happy, thrilled and delighted with the quality of product and workmanship - the installers could not have been more considerate and respectful. I will recommend you every chance I get. Thank you!!!

    E. Sylvester
  • The entire process was very smooth. Scott was great to work with on the sales side. Very informative. The measuring and ordering until delivery was weeks ahead of schedule. Cost seemed competitive with others we talked to. Very happy customer.

    L. Hay


Thousands of people have chosen our products and we appreciate each and every one! As a bonus to our valued customers we offer a $100 check for every verified sale provided by your recommendation. If you’d like to participate please do not hesitate to contact us.

Customer Referral

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