With over 45 years of tradition, we give our clients a peace-of-mind in Dane County and Capital Region around Madison.


Since 1976, Thebco has provided excellent residential and commercial exterior replacement windows, patio doors, entry doors and siding throughout the greater Madison area. You can count on our experienced, highly qualified team to help provide you with the perfect update to your home.

We offer a full range of home comfort services, including:

  • Replacement Windows: Count on our team to provide top-notch Window Replacement services, from insert double hung windows to full frame casement and bay windows.
  • Entry Doors: We offer comprehensive entry door system replacement including storm doors, sidelites, and transom windows and even garage service doors. Door are available in Steel and Fiberglass from Waudena.
  • Patio Doors: Our expert installers will replace your patio door with a Restorations patio door available in sliding or hinged door combinations.
  • Siding: We replace exterior cladding and siding with new vinyl, solid c-PVC, or insulated composite cladding. From corner posts to window trim, our team will update your home with a timeless look.
  • Interior Doors and Millwork: We do whole-floor interior trim and interior door replacement including solid core interior doors, baseboard, window trim, crown moulding, and chair rail. If you are ready to update your interior trimwork, reach out today!

We service the entire Madison Area, including, but not limited to:

Thebco is a leading exterior remodeling for windows, doors & siding replacement in the greater Madison area, including:

  • Baraboo
  • Cambridge
  • Columbus
  • Cottage Grove
  • Deforest
  • Deerfield
  • Fitchburg
  • Lake Mills
  • Lodi
  • Madison
  • Maple Bluff
  • Marshall
  • McFarland
  • Middleton
  • Monona
  • Monona
  • Mount Horeb
  • Oregon
  • Pardeeville
  • Portage
  • Poynette
  • Prairie Du Sac
  • Sauk City
  • Shorewood Hills
  • Stoughton
  • Sun Prairie
  • Verona
  • Waterloo
  • Waunakee
  • Windsor
  • Wisconsin Dells


Please fill out the form below for a free consultation.
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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.

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