Options to cover bay windows include treating the window as a single unit by hanging the cover outside the bay, or as individual units by hanging them inside the bay, suggests Betters Homes and Gardens. Curtains work with either treatment, but roman shades usually require treating the windows separately.
When treating the bay as a single unit, the owner can choose floor-length curtains that provide privacy when closed and frame the window when they are open. With bay windows that include a bench seat, curtains hanging inside the window should be trimmed to accommodate the length. With Roman shades, the owner can cover one window to provide protection from glare while keeping his view open.