Business Details
50 Years
experience
Trusted Window Door & Siding Replacement in Madison WI
Since 1976, THEBCO has been a locally-owned leader in window, door, and siding replacement across Madison, WI. Our team combines decades of hands-on experience with premium materials like Restorations Windows and Mastic Siding to deliver durable, energy-efficient solutions. Backed by an A+ Better Business Bureau rating and hundreds of verified reviews, we prioritize customer satisfaction through transparent communication, precise installations, and comprehensive warranties.Our expertise spans residential and commercial projects, ensuring tailored service for homeowners, property managers, and associations. With a focus on innovation and quality craftsmanship, weve built long-term trust through repeat clients and referrals, maintaining rigorous standards in every project phase from consultation to completion.
Services
Replacement Windows
Entry Doors
Patio Doors
Storm Doors
Siding Replacement
Window Installation
Door Installation
Exterior Siding
Energy-Efficient Windows
Vinyl Siding
Details
- Year established: 1976
Highlights and features
- 49 years of specialized experience in window and siding replacement
- A+ rating with the Better Business Bureau since 1976
- Lifetime transferable warranties on premium Restorations Windows
- Energy-efficient solutions reducing heating/cooling costs up to 27%
- Professional installations with meticulous cleanup and punctuality
Associations and certifications
- Better Business Bureau
What people say
Great customer service
Excellent installation
Energy-efficient products
Professional crew
Lifetime warranty
Services
Replacement Windows
Upgrade to energy-efficient Restorations Windows with double-contoured frames and low-E glass options. Our replacements reduce energy costs up to 27% while maintaining traditional aesthetics. Each installation includes proper insulation and air-sealing for maximum efficiency.
Entry Doors
Enhance curb appeal with Waudena steel or fiberglass entry systems featuring multi-point locking and decorative glass options. Our doors combine security ratings up to Grade 40 with thermal performance meeting ENERGY STAR standards for improved insulation.
Siding Replacement
Upgrade with Mastic vinyl or Ascend composite cladding that resists warping and fading. Our siding options provide R-values up to 4.0 with maintenance-free durability, available in multiple textures and colors to match architectural styles.
Patio Doors
Install energy-efficient sliding glass doors with dual weatherstripping and reinforced frames. Our systems improve thermal performance while providing smooth operation and enhanced security through multi-point locking mechanisms.
Storm Doors
Add seasonal protection with adjustable ventilation storm doors featuring scratch-resistant glass and durable aluminum construction. Our models maintain visibility while improving energy efficiency during harsh Wisconsin winters.
Questions
What areas do you serve?
We serve Dane County, including Madison, Sun Prairie, Verona, and Middleton for window, door, and siding replacements.
Do you offer financing options?
Yes, we provide flexible financing solutions to make home improvements accessible while maintaining product quality.
What warranties do your products carry?
Our Restorations Windows include lifetime transferable warranties, and siding products feature industry-leading coverage.
How long does installation take?
Most window replacements complete in 1-2 days, with larger projects scheduled efficiently to minimize disruption.
Are your installers employees or subcontractors?
All our crews are direct employees with extensive training in proper installation techniques and customer service.
Reviews (5)
Kelly Rego
Feb 15, 2026
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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.
Erin Buchmann
Feb 02, 2026
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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!
Sue Pellmann
Jan 06, 2026
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We were extremely happy with the work done by Holden Buie. He was prompt, thorough, pleasant to communicate with and he kept us informed of his progress throughout the project. We'd definitely be happy to work with him and the Thebco team again!
Adam Gehrke
Dec 29, 2025
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A+ highly recommend. Ive 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.
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.
Alane & Francois
Nov 17, 2025
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Jason, Kyle, and Jacob Schmidtke did a splendid job installing our new windows. They arrived on time, worked carefully and efficiently, and communicated progress with us clearly throughout the project. The result exceeds our expectations and we recommend them highly.
