Knowledgebase: DCLG Guide to DECs
Posted by Mike Gordon on 22 July 2015 12:41 PM

A building is defined as "a roofed construction having walls, for which energy is used to condition the indoor climate; a building may refer to the building as a whole or parts thereof that have been designed or altered to be used separately".

The total useful floor area is the total area of all enclosed spaces measured to the internal face of the external walls, that is to say it is the gross floor area as measured in accordance with the Building Regulations. In this convention:

  1. the area of sloping surfaces such as staircases, galleries, raked auditoria, and tiered terraces should be taken as their area on the plan
  1. areas that are not enclosed such as open floors, covered ways and balconies are excluded