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THEBCO Windows, Doors & Siding

Window Installers in Madison, Wisconsin

Ranked #4 in Madison | Grade A-
4.90 (691 reviews)(608) 249-2905

THEBCO Windows, Doors & Siding

Showroom-based guidance and in-home consultations for replacement windows and doors in the Madison area. Coordinated measurement, installation, sealing, and cleanup with attention to detail suited for Wisconsin weather.

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Why Homeowners Choose This Business

Local showroom support, coordinated scheduling, product guidance suited to Wisconsin seasons, and installation practices that emphasize weather sealing and cleanup.

Service Area

Madison, Wisconsin, Dane County, and nearby communities. Call to confirm scheduling in your neighborhood.

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How This Business Compares

A quick local comparison based on review strength, business detail, and local service fit.

  • Maintains a competitive standing in this market.
  • Performs at or above the local average rating.
  • Shows strong customer satisfaction signals based on review quality and volume.

Services Covered

Renovation Services Supplier Installations Window Replacement Basement Window Installation Entry Door Replacement Patio Door Installation Storm door installation Energy Efficient Windows Window Sealing And Caulking Flashing and Trim Work Home window installer Door Replacement Contractor Window Showroom Madison Residential Windows

Home window replacement, basement and foundation window replacement, patio and sliding door replacement, entry and storm door replacement, trim, flashing and sealing, and related removal and cleanup.

Reviews

Customer Reviews

Erin Buchmann

Jason and Jacob Schmidtke are real craftsmen! We had them replace the windows in our foundation. Everything, from the flashing to the caulking, is impeccably done. We will definitely go with Thebco again for our future window projects!

kelly rego

Love my new door! It looks great and I can tell it helps with keeping the cold out already. Holden was polite and professional. He applied new insulation around the door frame, cleaned up as he completed each step, and was able to remov…
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Love my new door! It looks great and I can tell it helps with keeping the cold out already. Holden was polite and professional. He applied new insulation around the door frame, cleaned up as he completed each step, and was able to remove my existing screen door and framing without damaging it so that it could be reused.

Holly Krook Castañeda, ND RYT 200

I’ve resorted to leaving a one star review. I have been waiting since July 2025 to get a cracked window replaced. The window has a lifetime guarantee. I have called once a month since July checking on the status. Dave in production always t…
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I’ve resorted to leaving a one star review. I have been waiting since July 2025 to get a cracked window replaced. The window has a lifetime guarantee. I have called once a month since July checking on the status. Dave in production always takes my calls so in terms of communication, they are responsive. The delay impacting us has been blamed on the manufacture. During my December phone call, I was informed the window would be delivered to the warehouse on January 9 and Thebco would call me to schedule the replacement. No Call. No word of any kind. It appears the lifetime warranty means YOU will wait a lifetime for your window to be replaced. This is really unbelievable that a local company would be satisfied with working with a manufacturer such as this when it impacts the customer so negatively. I was told I was not the only one experiencing such a delay. Now here we are in January 2026 with frigid cold temperatures! PSOT SCRIPT: Approximately 2 hours after posting this review, the company called me to say the “parts” were in and scheduled a time (in six days) to replace our cracked window.

Adam Gehrke

A+ highly recommend. I’ve had Thebco replace 8 openings & 2 exterior doors the past 2 seasons. They will return again this year to update 2 more windows. The product is superior. I have noticed the windows reflect sunlight in summer kee…
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A+ highly recommend. I’ve had Thebco replace 8 openings & 2 exterior doors the past 2 seasons. They will return again this year to update 2 more windows. The product is superior. I have noticed the windows reflect sunlight in summer keeping my house cooler and in the winter keeping cold air out. The install team of Jason & Kyle have been great and I have requested them to return again for next install. Dave Speer is great representative to discuss options when deciding what windows & doors, colors to choose. I switched some areas from double hung to awning style & crank out widows side by side to awning allowing much better scenic views. The storm door I have now is such a better upgrade from what I had previously. I am very satisfied with the quality of product and value when compared to competitors. A local company that is on top of everything from selection to completion.

Brian Musser

Ken and Mark did an amazing job replacing our sliding patio door!! They were very efficient and did the job in less than a day. We love the look of our new door. We also want to shout out Dave our fantastic sales person who was very helpful…
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Ken and Mark did an amazing job replacing our sliding patio door!! They were very efficient and did the job in less than a day. We love the look of our new door. We also want to shout out Dave our fantastic sales person who was very helpful throughout the entire process. Thanks!

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Frequently Asked Questions

What types of projects does THEBCO handle?

They focus on residential replacement of windows and exterior doors. Projects typically include measurement, removal of existing units, installation, sealing, and cleanup. Siding-related trim work around new openings may also be addressed as part of the installation.

How do I get an estimate for new windows or doors?

You can call the Madison, Wisconsin showroom or submit a request through their website to schedule a visit. A representative will review options, measure openings, and provide a written proposal. Timing and availability may vary by season.

What should I expect on installation day?

The crew removes existing units, installs new products, and completes flashing, insulation, and caulking. Installers typically protect work areas and clean up debris before leaving. Access to the work areas and clear space near openings will help the crew work efficiently.

How long do window or door projects take?

Many single-day installations are possible for a small number of openings, while larger projects may take longer. Lead times can vary based on product manufacturing and scheduling. THEBCO will provide an estimated timeline during the proposal process.

Do they service issues after installation?

Reviews indicate the office and production teams are responsive to service calls and follow-up needs. If a product-related part is required, timing may depend on manufacturer availability. Contact the showroom with your project details to start a service request.