Pennsylvania State Regulations on Size of Egress Window

If you are finishing a basement or building a new home, you'll soon learn there are permits to obtain and regulations to follow. Pennsylvania is no exception. Some of these regulations pertain to the windows, and to keep you and your family safe, some of the windows, such as those in basement bedrooms, must meet egress standards.

Window of home
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Egress windows can be used as an emergency exit.

International Residential Code

As of 2003, Pennsylvania adheres to the current International Residential Code regulations, so windows and exits must meet the current IRC egress criteria. Contact your local township to verify current code and regulations, and to obtain any necessary building permits.

What is Egress?

In construction, egress refers to the way in which inhabitants can escape from a building in an emergency situation. A window that meets IRC egress requirements is considered an acceptable means of escape. It is also a means for emergency personnel to enter the building if necessary.

Egress Windows

IRC requirements mandate that windows have an open minimum width of 20 inches and an open minimum height of 24 inches. However, together the two must equal a total net window clearance of at least 821 inches (5.7 square feet) when multiplied together. If the egress window is on the ground floor, a net clearance of 5 square feet or greater is required. In addition, the window sill must be no higher than 44 inches from the floor.

Other Egress Requirements

The window must be able to open fully without any obstructions and without the need for a key or tool to be considered egress. If a basement window has a window well, other egress requirements must be met, such as the well must be at least 9 square feet, and if the well is deeper than 44 inches, a permanent ladder or stairway must be in place.