Modern Windows & Doors Designed for Ontario Homes.
Experience energy-efficient, sleek, and durable window and door solutions — locally assembled and professionally installed across Southern Ontario.
100% Canadian Assembled Products
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Installed by Certified Professionals
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Energy Rebate Eligible
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In-Home Consultations Available
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Serving Southern Ontario
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100% Canadian Assembled Products • Installed by Certified Professionals • Energy Rebate Eligible • In-Home Consultations Available • Serving Southern Ontario •
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.
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)
Our 3-Step Process Makes It Easy
1.Call to Schedule a Phone Consultation
Our office will qualify your project and explain your options.
2.Free In-Home Assessment
A certified team member will visit your home to take measurements, review styles, and provide a personalized estimate.
3.Hassle-Free Installation
Our skilled installers ensure a clean, efficient setup with full removal of old materials.
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
Can’t Call Us?
Send us an Email and let us know what you’re looking for and we’ll get back to you within 1-2 business days.