This document specifies the definition and calculation of surface area and volume indicators.
In defining area measurement, this document uses three measurement concepts:
a) the intra-muros and extra-muros concept used in many parts of the world;
b) the wall centre method of measurement used in many parts of the world;
c) variations on these methods to comply with certain national laws or for particular types of
The surface area and volume indicators defined in this document are intended for practical use, as a
basis for measuring various aspects of the performance of buildings or as a planning aid. In other words,
they should enable judgement to be made on functional, technical and economic aspects of buildings.
This document is intended to be used when establishing
— specifications for the geometric performance of a building and its spaces (e.g. in design, purchasing
procedures, etc., or in building regulations where appropriate),
— technical documentation relating to the performance of whole buildings prepared by designers,
contractors and manufacturers,
— the amount of floor area that will not be effectively available for the placement of an individual’s
workplace, furniture, equipment, or for circulation, and
— evaluation, comparison or control of the properties of a building which are connected to its geometric
NOTE Although there are a variety of methods of area measurement around the world depending on the
country and/or types of buildings, all measuring methods are not necessarily of practical use because of inability
to identify real area (e.g. the wall centre method of measurement). Thus, this document specializes in the
measurement solely for practical use.

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