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Business ProfileWindow Installers in Knoxville, Tennessee

Performance Windows Knoxville

Listed in Knoxville 4.90 (59 reviews)(865) 378-5002

Performance Windows Knoxville

Performance Windows Knoxville replaces windows in Knoxville with custom-made Alside windows manufactured in the United States. Two friends with years of experience in the traditional window industry founded the company.

Last Updated October 1, 2026.

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Business Highlights
  • Its installers are window specialists with thousands of installations behind them.
  • Its lifetime limited warranty covers the frame, installation and materials as long as the owner lives in the home; it is transferable within 10 years of installation.
  • Alside includes a glass-breakage warranty for accidental cracks and breaks.
Service Area

Knoxville, Tennessee.

Active Business Listing

Performance Windows Knoxville is one of 12 window installers ProsGrade lists in Knoxville, Tennessee.

Active
Public local listing
Listing details

5 services listed, including Double-hung windows, Slider windows and Picture windows. Open Monday to Saturday. Rated 4.9 from 59 reviews.

  • Verified listing details
  • Service information
  • Customer review signals
  • Photo gallery
  • Public contact information
  • Published local profile

How This Business Compares

How Performance Windows Knoxville compares with the other 11 window installers on ProsGrade in Knoxville, using public Google ratings and review counts.

  • Ranks in the top half of the 12 Knoxville window installers on ProsGrade by Google rating and review volume.
  • Rated 4.9 on Google, at or above the 4.8 average of other Knoxville window installers on ProsGrade.
  • One of 10 Knoxville window installers on ProsGrade rated 4.7 or higher from at least 10 reviews.

Services Covered

5 services
  • Double-hung windows
  • Slider windows
  • Picture windows
  • Bay and bow windows
  • Specialty windows

Reviews

What customers say

Customers praise professional installation crews and thorough cleanup. One customer reports that 13 windows and a three-panel glass door were replaced in two days, and that the company had someone check the finished work.

Customer Reviews

denisha lubiani

We had a great experience with this window installation team. They arrived right on time, were extremely courteous and professional throughout the entire process, and paid close attention to every detail. What really stood out was how meticulously they cleaned up afterward—our home was left spotless. The installation was smooth and well executed, and it was clear they take pride in their work. Highly recommend them to anyone looking for reliable, high-quality service.
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Kortney Jarman

Performance Windows has been fantastic to work with. From the initial visit to the installation they have been very communicative and the windows look great. The installation crew were friendly and did a great job and were very thorough and cleaned up everything.
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Donna Mosby

Check out our new windows! looks so good! We are pleased and very satisfied with Performance Windows. From the sales pitch to the installation, through the final walkthrough- great job.

Sally Luper

I loved how the install went. The installers were very polite and I am pleased with how the windows look. They went above and beyond expectations I highly recommend them.

Haley Humphrey

Performance Windows did a fabulous job replacing all our windows and living room door. We had 13 windows and a 3 panel glass door replaced, only took 2 days to complete. The workers were very diligent and respectful. The company even had someone come out to check the finished product and ensure it was up to standards and see if we had any questions or concerns. Would HIGHLY recommend this company for your window and door needs!!
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Frequently Asked Questions

How long does Performance Windows' window replacement process take?

The full process from the first quote to final installation takes about 10–14 weeks. Measuring takes place 1–3 weeks after approval; custom windows are then built, and installation usually takes one day or two for larger jobs.

Will Performance Windows' replacement windows reduce visible glass area?

Replacement windows slightly reduce the visible glass area by an inch or two.