Gross internal floor area
The gross internal floor area of a building is the area measured to the internal face of the perimeter wall for each floor level. It includes areas occupied by internal walls and partitions, columns, piers and other internal projections, internal balconies, stairwells, toilets, lift lobbies, fire corridors, atria measured at base level only, and covered plant rooms.
It excludes the perimeter wall thickness and external projections, external balconies and external fire escapes. Furthermore, unused areas such as unheated cellars or lofts are not included in the gross internal floor area. Its unit is measured in m?. If you do not have this exact figure, fill in figure using a slightly different definition of the floor area.
Example A: Myatt Primary School
The example school contains three floors, each with an internal floor area of 1.500 m2. Furthermore there is a cellar that is unheated and not used. Regarding the definition the gross internal floor area amounts to 4.500 m2.