Last edited 01 Apr 2020

Zone area

The National Calculation Methodology (NCM) modelling guide (for buildings other than dwellings in England), 2013 edition, published by the Department for Communities and Local Government (DCLG), defines ‘zone area’ as:

Floor area of zone calculated using the internal horizontal dimensions between the internal surfaces of the external zone walls and half-way through the thickness of the internal zone walls. Used to multiply area-related parameters in databases.

‘NB: If the zone has any virtual boundaries, e.g., no walls in certain orientations, the area of the zone is that delimited by the ‘line’ defining the virtual boundary.'

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