Built for Ontario. Trusted by Ontarians.
ON Windows is a proudly Ontario-based company specializing in premium replacement windows and patio doors. All products are assembled right here in the province, using high-performance, low-profile frames designed to maximize natural light while maintaining energy efficiency year-round.
Whether you're updating a detached home in Hamilton or retrofitting a semi in Guelph, our expert team delivers a stress-free process — from your first phone consultation to installation day.
Ontario's Go-To Window & Door Experts
Locally Owned & Operated
100% Assembled in Ontario
Smart Home Compatible Options
Rebates Available
Premium Products Without Markup
Friendly Service With a Clean Finish
Proudly Serving Southern Ontario
We work where the work makes sense. From Hamilton to Kitchener-Waterloo, and everywhere the leads are strong.
We currently do not service Brampton.
Common service areas:
Hamilton
Guelph
Kitchener
Cambridge
Burlington
Oakville
Niagara Region
Modern Windows That Perform in All Seasons
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Hinged design for maximum airflow and full seal closure
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Opens outward from the bottom, perfect for year-round use
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Horizontal sliding panels for compact openings
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Traditional and functional, great for retrofits
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Fixed glass for modern aesthetics and daylight
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Rounded, arched, and geometric shapes available
Patio Doors – Sleek, Strong & Secure
Designed for comfort and style, our patio doors are manufactured in Canada — offering the perfect blend of Contemporary elegance and North American durability.
Slim Profiles for more glass and less frame
Smooth Gliding Mechanisms
Multi-Point Locking Systems for added security
Custom Sizes and Finishes Available
Smart Home Add-Ons available (locks, sensors, open/close automation)
