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
"Process was fully explained from start to finish and delivered as promised. High quality windows and attic insulation for an affordable price. Company was very professional and answered all questions. Great warranty. Installed 15 custom windows in one day. Definitely recommend!"
+41
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1984
Free estimates
Emergency services offered
"Had a problem with a pet tearing my screens. Jay gave me his expert opinion and recommended a pet proof screen. He installed that in the back and a regular screen for my front door. They both look great. So far so good with the pet screen! ?"
+7
Serving Cos Cob, CT and surrounding areas
Approved
In business since 1961
Free estimates
Credit card accepted
"I waited a while because they are backed up due to Covid but they were definitely worth the wait. They were precise, quick and extremely detailed. They put two windows in for me (where windows didn't exist before) and covered up a window. They insulated and everything. No painting but that was cool. I was very impressed. Definitely would recommend them and hire them again...and again....and again"
+38
Serving Cos Cob, CT and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Offers commercial services
Customers say: Terrific value
"Two great workers who did an excellent job cleaning my dirty windows"
Serving Cos Cob, CT and surrounding areas
Approved (Corporate)
In business since 2000
Free estimates
Warranties offered
"I liked that there was no nonsense. Their salesman was straightforward and the price was fair. We were also impressed with the installers. They installed all the windows in 1 day and they look great. I'm happy I chose them."
+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."
Serving Cos Cob, CT and surrounding areas
Approved
In business since 2011
Free estimates
Emergency services offered
"Great work with reasonable price. Strongly recommended."
+28
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