QSI Windows & Doors

Founded in 1976, QSI is one of the Golden Horseshoe’s most reputable Window, Door and Sunroom companies, with sales and installation teams working year round – remarkable given the harsh Southern Ontario winter weather.

QSI’s new head office and showroom facility in Stoney Creek offers fully operational, full size Window, Entry and Patio Door displays. Customers are invited to experience the quality that is synonymous with our high performance product, installation and people.

We are extremely proud of our people and our relationships with all QSI customers, friends and suppliers.