The sum of all areas at each building floor level, including basements, floored roof spaces, attics, garages, enclosed porches & attached enclosed covered ways alongside buildings, plant & equipment rooms, lift shafts, ducts, staircases and all other fully enclosed and usable floor spaces.

It is calculated by measuring from the normal inside face of exterior walls (i.e. excluding the wall thickness) ignoring projections such columns, piers, plinths and the like on the normal inside face of exterior walls.

It shall not include open courts, light wells, connecting or isolated covered ways and net open areas of upper portions of rooms, lobbies, halls and the like which extend through the storey being computed.

Unit: FECA unit = m2