Ostaco Windows & Doors

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What differentiates Ostaco from our competitors is how we run the business, day in day out. Family owned and operated, we take pride in the fact that we have many long-standing members of the Ostaco team. Our approach is simple, if we take care of our people, then we can rest assured that our customers are getting quality service and an exceptional finished product made by people who care. This is the reason why we have been successful for over 35 years, and have a dealer network that spans across Canada.

Ostaco has been a leading manufacturer of custom windows and doors in southern Ontario since 1981. We offer the solutions and options to suit all your needs. Whether it’s a new build, custom home, or a renovation, all Ostaco products are made to order. And rest assured, you can customize without sacrificing performance. Our products are certified by the highest fenestration standards, Quality Auditing Institute and Energy Star, and are backed by an industry leading limited lifetime warranty.


We work tirelessly to improve and refine our windows and doors. Even after three decades in the business, we are still pouring time and money into research and development. This means plenty of dialogue with the people whose experience really counts: our dealers. When these important team-members asked us to find ways to make a high-performing modern window look and feel more like a traditional wood window, we acted on their insight by maximizing glazed area, removing weld seams…and many other mechanical fine-tunings!

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