The requirements for basement egress windows vary according to a state's regulations, but generally include approximately 6 square feet of space and the height no more then 44 inches. A window well may also be required depending on how far underground the basement is.
The space required for the window is 5.7 square feet, however the surface the space is calculated from can vary. Some states may measure the inside of the glass, while others measure the frame. So, using a space with 6 square feet allows for a safe retrofit process, notes Popular Mechanics.
Although all bedrooms are required to have an egress window, not all basements may need one. However, if a basement is large and has a closet on location, states will consider it a bedroom and require one.