Gross floor area

Gross floor area

The area within the perimeter of the outside walls of a building as measured from the inside surface of the exterior walls without reduction for hallways, stairs, closets, and thickness of the walls.

gross floor area

The area within the perimeter of the outside walls of a building as measured from the inside surface of the exterior walls, with no deduction for hallways, stairs, closets, thickness of walls, columns, or other interior features; used in determining the required number of exits or in determining occupancy classification. Also see net floor area.