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Since 1981, Ostaco's Mission has been to excel as a manufacturer of vinyl windows & doors of unparalleled quality!

Throughout its history Ostaco has always prided itself for being a benchmark in the Canadian window & door industry, providing high quality, innovative products, and exceptional customer service. The 20 Year Ostaco Warranty is one of the best in the business. All Ostaco windows are custom sizes and manufactured to your personal specifications.

Ostaco products have been tested and are certified at the highest levels by the National Fenestration Rating Council (NFRC) and carry the Energy Star rating. Ostaco's facility and procedures are also certified by the National Accreditation and Management Institute (NAMI). Ostaco Windoors Inc. is a member of the Canadian Window and Door Manufacturers Association.

Ostaco has over 100 employees and its own fleet of delivery vehicles. Ostaco's products are sold throughout Ontario, into the United States and around the world. Our customers continuously compliment us on our ability to deliver when promised and on the job our customer service and sales reps do to ensure that their needs are always met.