Bay windows are considered one of the most elegant and chic window designs available today. They are built using a combination of three windows of varying sizes, these windows project out of the main wall to create a bay. Bay windows look great in large rooms with high ceilings. They provide an amazing scenic view and a touch of elegance to your room. You have more light and more space! Typically, you have a large centre window that is surrounded by two smaller windows. uPVC Bay windows are often double-hung so that you have proper ventilation. The centre window also provides an unobstructed view of the world outside. The two smaller windows are angled from the wall at approximately 30 to 40 degrees.