Last edited 27 Apr 2017

Single-storey building definition

Approved document B, Fire Safety, Volume 2, Buildings other than dwellinghouses, defines a single-storey building as:

'A building consisting of a ground storey only. (A separated part which consists of a ground storey only, with a roof to which access is only provided for repair or maintenance…) Basements are not included in counting the number of storeys in a building.'

Where, a ‘storey’ includes:

  • Any gallery if its area is more than half that of the space into which it projects; and
  • A roof, unless it is accessible only for maintenance and repair.

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