What are Egress Windows?
Egress windows are designed to allow people to escape a basement in the event of a fire. Most often, egress windows are installed during a basement renovation in order to comply with local building codes. Many towns have specific measurements that must be met, so it will be necessary to contact your local building-codes office in order to find out exactly what size window you must install in your basement.

Function
Egress windows come in as many varieties as typical windows, with as many different levels of quality and insulation, depending on the manufacturer. But all egress windows are designed to provide a safe escape route in the event of emergency. Most often, they provide about 6 square feet of roughly rectangular window surface. Check with the manufacturer if there is any question of whether a particular window is suitable to be used as an egress window.