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Serving the Golden Horseshoe for 40 years, the secret to our success is really no secret at all – we take great pride in our quality, service, installations and our people. “Everyone at QSI is committed to the best window and door installation experience possible and this has been our guiding principle since 1976.”
Rely on QSI for best performance windows and doors. Featuring the latest in advanced technology, all of our windows are ENERGY STAR® certified, and most of them actually meet the 2020 Most Efficient designation!
At QSI, we’re your local experts for high-end windows and doors in Hamilton and the Golden Horseshoe, including: Oakville, Burlington, Niagara, Grimsby, Cambridge, Kitchener, St. Catharines, Halton & all surrounding municipalities. We proudly feature all our quality products on display in full scale, just how they would be installed on your own home. Visit our newly renovated 6,000 sq ft showroom in the Hamilton Mountain Industrial Park, at the top of the Red Hill Valley Parkway. It’s worth the drive to Hamilton! Book your free in-home consultation or come visit our showroom at 175 Nebo Rd. Hamilton, Ontario.
QSI Is Proud to Service the Following Areas
Experience the difference QSI SmartComfort ™ Home Products make.















