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Top Testimonials and Reviews

Guaranteed Windows and Doors has been serving Windsor with quality windows and doors for many years. We have the experience and expertise to help you with the right products for your property. Please read our customer testimonials to learn about the quality of our products and services.

Love My New Windows

“I hired Guaranteed Windows and Doors to replace the 11 year old windows in my house when the price they quoted me was much more reasonable then the other companies. I do not regret my decision. Mario was great. They addressed all my concerns and questions without hesitation and professionally. Turns out the wood supporting my front window was a home for carpenter ants and Mario replaced the wood, insulation and drywall at no extra cost. I love my new windows!”

- Tammy S.

Fantastic Job

“Wonderful experience with this company from start to finish. Because of an issue with my old windows this went from a simple retrofit to rebuilding the frames but our installer, Tom did a fantastic job. Tom kept us informed with every step, did a professional job with the install and did a thorough clean-up afterwards. I would recommend this company to anyone looking for a good price, good quality materials and installation beyond what I expected. Thank you Guaranteed Doors and Windows!”

- Peggy D.

Job Well Done

“Tom and Gord came and did my install. They were awesome! They went the extra mile to ensure I was happy. The whole thing took less time than I thought. I had some problematic windows but they took it all in stride. The install was later than anticipated but due to delay from factory. Thanks Tom, Gord and Mario for a job well done!”

- Ross T.


“Excellent company run by Mario and Janice- they made my window installation smooth, efficient!”

House looks great!👌

- S M

Professional Installation

“Great company to deal with as they were the best pricing in Essex County. Fast courteous professional installation  by Tom and Gord.”

- Michael R.

Great Value

“We recently hired Guaranteed Windows to replace our windows. We found them to be a really honest, professional and friendly company. Their price was fantastic and we feel that we really received great value for the money. They were very agreeable to everything we asked and the installer was very respectful of our home. We couldn't be more satisfied with the products and the installation. I would heartily recommend them!

- Sherman

Everything Worked Great

“I had this company install 8 windows for me. One of them they had to cut through brick for a bigger window. Did a very good job, right down to the trim inside and out. There was a problem ordering my basement windows but it was handled very quickly and very professionally. I am so happy with my new windows. Great job Guaranteed  windows. If I ever need anything done again I will for sure call you.  Thank you so much for understanding my health and working with me. Installers were great people too. I cant Express how happy I am everything worked great. Thank you thank you thank you.”

- Karen H.

Friendly and Accommodating

“I have had Guaranteed do two full houses of windows and doors for me, and I have never had an issue. Someone else complained that their product came in very late this winter but I can attest that this winter was very busy for them and the manufacturer as, I too, ordered my house full in the winter. The office staff, I have found to be friendly and a pleasure to deal with.

Mario is always an easy going, friendly guy that I find to be accommodating and have enjoyed doing business with over the years. I had the same installer for both homes (I requested him for the second ), Chris, is a hard worker and incredibly capable at what he does. He does not compromise on what is the best route to get the job done.

Although the prices are very competitive, the warranty is actually followed through with, and Mario is a pleasure to work with for sales, if the installers do not do their job well, it will not matter how good the product is.

I have always, and will always recommend Guaranteed.”

- D C.

Professional Company

“Incredible quality and service. Including follow up after the job. Respectful and professional company. No buyers regret , we love our new windows.”

- Kari S.

Everything Was Great

“From sales to installation, everything was great. From my research they have the best quality and energy efficient windows by far.”

- JP

Most Beautiful Windows and Doors

“I want to say thank you for the most beautiful windows and doors they have provided a high-end curb appeal to our home. The installers Tom and Gord, I just can not say enough about their work ethics, so detailed and perfection on every detail of installation. I know the rating scale is 1 through 5 however this overall rating for my satisfaction of this company's product and installers: Tom and Gord is 100 stars plus.”

- Jack R. P.

Great Windows and Doors

“Positive: Professionalism, Punctuality, Quality, Responsiveness, Value

Great windows and doors. The best energy efficient and guarantee.”

- Lee

Windows Look Fantastic

“Mario and his crew (Chris) did all of our windows and doors. We originally got 2 windows done to see how it would go. Then later on they installed our patio door, and then a few years later they did the rest of our windows. All together they replaced 11 windows, 1 patio door, our entrance door and a garage door. I would recommend this company to anybody. They were very professional. We did have a little problem with the entrance door months later when it got cold. They came in and fixed it right away. Our windows look fantastic. They clearly stand behind their work and warranty.”

- Ruggedy A.

Recommend 100%

“This company did a great job on our windows...recommend 100% for your window needs!”

- Dave G.

Quick and Friendly

“Positive: Professionalism, Quality, Value

The windows were installed in a couple of day for the entire house. Installer was friendly and cleaned up very well.”

- Kari

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