GIA is the area of a building measured to the internal face of the perimeter walls at each floor level. Including:
- Areas occupied by internal walls and partitions
- Columns, piers, chimney breasts, stairwells, lift-wells, other internal projections, vertical ducts, and the like
- Atria and entrance halls, with clear height above, measured at base level only
- Internal open-sided balconies, walkways, and the like
- Structural, raked or stepped floors are property to be treated as a level floor measured horizontally
- Horizontal floors, with permanent access, below structural, raked or stepped floors
- Corridors of a permanent essential nature (e.g. fire corridors, smoke lobbies)
- Mezzanine floor areas with permanent access
- Lift rooms, plant rooms, fuel stores, tank rooms which are housed in a covered structure of a permanent
- Nature, whether above the main roof level or not
- Service accommodation such as toilets, toilet lobbies, bathrooms, showers, changing rooms, cleaners' rooms, and the like
- Projection rooms
- Voids over stairwells and lift shafts on upper floors
- Loading bays
- Areas with a headroom of less than 1.5 m
- Payment vaults
- Garages
- Conservatories
Excluding
- Perimeter wall thicknesses and external projections
- External open-sided balconies, covered ways and fire escapes
- Canopies
- Voids over or under structural, raked, or stepped floors
- Greenhouses, garden stores, fuel stores, and the like in residential
Last Updated on Tuesday, March 12, 2024