...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.
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