Low rise housing comprises detached, semi-detached and terraced housing and flats( with not more than four self contained dwelling units per floor accessible from one staircase), of not more than three storeys above ground, intended for domestic occupation and of traditional masonry construction, with timber roofs and floors or concrete. Roof space constitutes a storey of the house -----Original Message----- From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Clive Williams Sent: 09 July 2008 16:05 To: [log in to unmask] Subject: Low rise housing I've been asked what constitutes low-rise housing in regard to NHBC's soil gas assessment methodology. I can't see anywhere in the document that defines low-rise but intuitively a 2-storey house would qualify, but what about 3 storey town houses or loft conversions.