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4.5 stars from 31 Google reviews
GTS Windows & Doors Reviews
GTS Windows & Doors holds a 4.5-star rating from 31 reviews on Google. Since 1986 we have installed and repaired windows and doors for homeowners, property managers, builders and businesses across Kitchener, Waterloo, Cambridge, Guelph and the surrounding townships, and those reviews come from the people we have worked for. A rating built across many real jobs says more than any claim we could make about ourselves on our own website.
We point to our Google rating first because it is independent. Customers post directly on Google, we cannot edit or delete what they write, and you can read every review, good and less good, in one place. The excerpts on this page are taken word for word from those Google reviews, and Google shows when each one was posted so you can judge how recent the feedback is.
This page explains how reviews are collected, what customers tend to mention and how to add your own. If you are comparing installers, reviews work best alongside the credentials behind them: licensing, liability insurance, WSIB coverage and a written warranty that covers labour as well as parts. Together they tell you how a company treats customers today and what happens if something goes wrong years later.
- Since 1986Four decades in Waterloo Region
- 20-Year WarrantyParts and labour, in writing
- Licensed & WSIBFully insured crews
- ENERGY STARRated windows and doors
- SAWDAC MemberIndustry association
Our Google Rating
At the time this page was last updated, GTS had 4.5 stars from 31 Google reviews. The live figure on our Google Business Profile is always the most current source.
Below is a rotating selection of our 5-star reviews. You can read each one in full, along with every other review, on our Google Business Profile.
5-Star Reviews From Our Customers
Short excerpts from our 5-star Google reviews, most recent first. Read every review in full on Google.
“The new windows and patio door are excellent quality”
Laura B.Windows and patio door · Google review, 2026 “Professional, knowledgeable about the work, clean installation…”
Kevin N.Installation · Google review, 2026 “Excellent service, great products.”
Jessica S.Google review, 2025 “…so pleased with the windows, workmanship, clean-up and the people we met”
mzke E.Window replacement · Google review, 2025 “My balcony doors look beautiful and I couldn't be happier!”
SheIsBaneBalcony doors · Google review, 2025 “Amazing service, very quick installing my balcony doors.”
Summer M.Sliding balcony doors · Google review, 2025 “…they did an amazing job on replacing our door and made it look nice”
Tessa R.Door replacement · Google review, 2025 “…did an exceptional job here at my place today installing new doors.”
Tammy G.Door installation · Google review, 2025 “…fast and clean I now feel safer in my home thanks to them”
Xtina A.Door replacement · Google review, 2025 “…installed a patio door with great workmanship and Skill.”
Donna L.Patio door · Google review, 2025 “They were really fast and cleaned up any mess made.”
JD D.Patio doors · Google review, 2025 “Does amazing work. Very quick and efficient. Highly recommend their work!!”
Pixie P.Google review, 2025 “Great work! Very quick, competent, and friendly.”
Jenna C.Google review, 2025 “The windows look incredible! …they were knowledgeable, kind and professional.”
Kat N.Replacement windows · Google review, 2024 “So impressed with their finish work when installing doors and windows.”
Scott S.Windows and doors · Google review, 2023 “…cut out our old window and brick and install beautiful French doors”
Vlad R.French doors · Google review, 2022 “David and his team went above and beyond to ensure a great customer experience.”
Joel F.Window installation · Google review, 2022 “…amazing workmanship, a clean and tidy worksite and a beautiful end product.”
Matt R.Windows and entry doors · Google review, 2021 “…3 different installs and have been beyond satisfied each time.”
BrandonWindows and doors · Google review, 2021 “Great pricing, friendly team and very tidy installations!”
Craig V.New windows · Google review, 2019 “Work site was left spotless and workmanship was amazing.”
Vladimir V.Window installation · Google review, 2015
How Reviews Are Collected
Once a job is finished, we invite customers to share their experience on Google. Reviews are posted and displayed by Google, not by us, and we do not offer discounts or gifts in exchange for them.
What Reviewers Mention Most
A few themes come up again and again in our Google reviews. Many relate to sliding patio door installation and entry door replacement, two of the most common jobs we handle.
- Patio doors: replacing old sliders with new, smoother-running units
- Door replacement: front and entry doors swapped and sealed
- Tidy installers: crews who clean up and leave the house as they found it
- Friendly service: installers who explain the work and are easy to deal with
Checking Us Out as a Contractor or Property Manager
Commercial clients usually need more than a star rating. Ask us for a certificate of insurance and a current WSIB clearance certificate, and ask about work on buildings like yours when we visit.
Our commercial windows and doors page explains how we handle occupied buildings, and our credentials are set out on the about GTS page.
Share Your Experience
If GTS has worked on your home or building, we would value your review. Tell other customers what was installed, how the crew worked and how the result has held up since.
Find GTS Windows & Doors on Google Maps and leave a review.
If something about your installation is not right, call us first at 226-806-0597 so we can look at it. Covered issues fall under our 20-year parts and labour warranty.
Start Your Window or Door Project
Call 226-806-0597 or request a quote to book an on-site measure with the team behind these reviews.
Call or text226-806-0597- Monday to Saturday: 7:00am to 9:00pm
Sunday: 9:00am to 5:00pm - 47 Bridge Street East, Kitchener, ON N2K 1J7