Bay windows project outward from the side of the house. They are made up of a central window and two side windows. The central window is usually fixed, and parallel to the existing wall. The side windows are set at a 30°, 45°, 60°, or 90° angle. They’re often casements or double-hung styles and are either stationary or operating. Bay windows have a deep sill area that’s commonly used as a display for plants. Whether you choose to install a bay window in your master bedroom, kitchen, or living room, there are several advantages and disadvantages to consider.