Last edited 29 Jan 2018

Dwelling type

According to Approved Document L1A of the Building Regulations, the term 'dwelling type' refers to:

...the particular group allocated to each dwelling on a development to provide the basis for assessing the pressure testing regime. The allocation of each dwelling to a dwelling type should be the responsibility of the person carrying out the pressure testing. To be classed as of the same type, dwellings should:

  • Be of the same generic form (i.e. detached, semi-detached, end terrace, mid-terrace, ground floor flat (including ground-floor maisonette), mid-floor flat, top-floor flat (including top-floor maisonette).
  • Include the same number of storeys.
  • Have the same design air permeability.
  • Have similar adjacency to unheated spaces such as stairwells, integral garages etc.
  • Have the same principal construction details.
  • Have a similar (i.e. +1) number of significant penetrations, i.e. for windows, doors, flues/chimneys, Supply/exhaust terminals, waste water pipes.
  • Have envelope areas that do not differ by more than 10 per cent.

NB The 2015 edition of Approved document M, Volume 1: Dwellings, introduced three different types of dwelling for the purposes of setting out requirements for access to and use of buildings:

See: Types of dwelling in approved document m for more information.

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