City Glass Company
“A great company to have in our community, honest, high quality and excellent service.”
Best Window Installers in Janesville, WI
15 companies listed · 10 in Janesville · 1 open 24/7 · 6 open weekends · 12 rated 4.5+
Data verified October 20, 2026
Bob's Custom Windows & Siding
“I love their work ethic because they were so attentive to trash or debris, they were on time and courteous.”
Wisco Roofing and Windows
“Crew took extra care of our surrounding property and did a thorough cleanup after they were done.”
ABC Seamless
“Everyone was so nice and took the time to answer all the questions we had.”
Distinct Exteriors & Roofer in Janesville
“They got me scheduled quickly and on the day of work, the crew arrived early and were professional.”
Legan Construction & Remodeling
“You won't find a company that will work harder to get you what you want.”
Listed for homeowners in and around Janesville, WI, these 15 companies fit and repair windows. Frame materials, glass options and any credentials shown are taken from company websites; the customer lines are quoted from public reviews.
Area overview: Janesville, WI
10 of the 15 companies we list are based in Janesville; the other 5 serve Janesville from Beloit (10 mi) and Fort Atkinson (13 mi). The companies on this page are rated from 4.1 to 5.0 across 509 reviews; 2 have 50 or more reviews and 12 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (89%) and responsiveness (85%). The topics that come up most in reviews of the companies on this page are "communication", "estimates" and "price". 1 is open around the clock; 6 are open on Saturdays and 1 on Sundays. The services the companies on this page list most often on their websites are gutters (2), residential roofing (2), roof replacement (2), roofing (2) and siding (2). 3 show a license on their websites; 1 lists staff certifications (GAF) and 5 have a BBB rating of A or A+. 9 have ten or more years of experience, the longest 44 years. 2 offer emergency call-outs; 5 offer financing or payment plans; 10 give free estimates; 2 are family- or locally-owned and 2 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Which listed window installers say they are licensed?
3 of the 15 listings on this page show a license on their websites. Contractor licensing is handled at state level and the license can be checked with the issuing board, including whether the insurance behind it is current. The listing repeats what the company published about itself and is not a verification of it.
JC Builders Inc
“This is the second major project they have done for us and we continue to be highly pleased and impressed with the workmanship and the business integrity which they embrace.”
Congress Glass
“They right away told me if I brought our windows down myself it would save a significant amount of money, which it did.”
Advanced Construction
“The Advanced workers were all so professional and kept to their word of leaving my home cleaner than they'd found it!”
Budget Home Improvement Inc.
“They made the process of new windows for the entire house stress free.”
Aurum Contracting
“I am so very happy with the service and craftsmanship of the work completed at my home.”
Riedl and Son Exterior Specialists
“They were fair and efficient and completed the roofing in record time.”
Century Exteriors
“Very professional people and 100% satisfaction with their services, installation and repair.”
Above the Peak Construction LLC
“Even weeks after project close, ATP came out and secured a piece of compromised siding that had dislodged in a dormer from a wind storm, followed by further reinforcing similar pieces.”
PK Contractors Inc.
“Jon was extremely responsive and committed to working with our insurance company to resolve some wind storm damage to our roof.”
Why these companies made our list
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