4.6 
161 *The Angi rating for Window Service companies in Cos Cob, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
*The HomeAdvisor rating for Window Service companies in Cos Cob, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
Last update on November 17, 2025
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1996
Free estimates
Warranties offered
"Gary and his crew replaced 22 windows for us in one day on our 1969 colonial. They did a great job and I would hire them again."
+45
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1985
Free estimates
Emergency services offered
"I'm so happy with my new windows! My only regret is that I don't have more windows to replace! Aaron and his team were a dream to work with - communicative, friendly, and direct. They worked with me to scope out exactly what I wanted and they were very transparent and fair on price. The installation team was efficient and respectful, making sure everything was done to the utmost standards. My windows look amazing but more importantly they work fantastically! I was shocked at how much quieter and cooler my house was after the new windows were installed, and they are so much easier to keep clean. I will be recommending Thermo-Seal to everyone!!"
+29
Serving Cos Cob, CT and surrounding areas
Approved (Corporate)
In business since 1992
Free estimates
Warranties offered
"The guy did an excellent job. I have no complaints. This was our 2nd window project and we really liked the windows we did 6 years ago so finished off the house."
+41
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1970
Free estimates
Offers commercial services
"We just needed the pane in one window replaced. They came to look at it the same day I called. He measured and ordered the window in less than 10 mins. As he said, 10 days later the window pane arrived. They came and installed the window that day in less than half an hour. The service was great, timely and affordable. I will definitely remember them for any future window replacements."
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1984
Free estimates
Emergency services offered
"Jay replaced several torn window screens. Great customer service & wonderful job."
+7
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1961
Free estimates
Credit card accepted
"Guys were professional, windows look great. Jason & Eddie are fantastic."
+38
Serving Cos Cob, CT and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Offers commercial services
Customers say: Terrific value
"Clear description of work. Stuck to schedule and did a great job cleaning the windows."
Serving Cos Cob, CT and surrounding areas
Approved (Corporate)
In business since 2000
Free estimates
Warranties offered
"Installed 22 new windows, 2 entry doors, and new sliding glass door. Outstanding service, price, and installation. Highly recommend."
+55
Serving Cos Cob, CT and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Worked with Guncay Glass & Mirror several times with Satisfactory results and professionalism in each project. Well priced and always on time, will keep using them over and over."
+37
Serving Cos Cob, CT and surrounding areas
Approved
In business since 2001
Free estimates
Credit card accepted
"Carlos was very great to work with. Was flexible with scheduling and did impeccable work. My windows are spotless! He was also able to have the entire interior of the house cleaned. Highly recommend Carlos for both window cleaning and interior cleaning services."
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