Treat yourself to the most stylish replacement windows and doors in Toronto and the whole of Greater Toronto Area. At Alpha Windows and Doors, we offer a wide selection of products, each with its own styles and characteristics to choose from. There is something for everyone.Our Energy Star labeled windows and doors simplify your purchasing experience. Energy Star is an internationally recognized symbol for energy efficiency. Not only does it help you identify energy efficient products, but it helps you save cost and the environment as well. more... See more text