BS9251:2005 

Domestic Occupancies 

system design is 2 heads operating for 10 minutes duration  

Individual dwelling for occupation as a single family unit used or constructed or adapted to be used wholly or principally for human habitation such as individual 

dwelling houses, individual flats, maisonettes and transportable homes with a maximum individual room size of 40 sq m 

Residential Occupancies 

system design is 4 heads operating for 30 minutes duration 

Occupancy for multiple occupation not exceeding 20m in height with a maximum individual room size of 180 sq m such as apartments, residential homes, houses of multiple occupancy (HMO’s), blocks of flats, boarding houses, aged persons homes, nursing homes, residential rehabilitation accommodation and dormitories

Extent of Protection 

Sprinkler protection should be provided in all parts of the dwelling with the permitted exception of: 

bathrooms with a floor area of less than 5 sq m 

cupboards and pantries with a floor area of less than 2 sq m and where the least dimension 

does not exceed 1m and the walls and ceilings are covered with non-combustible or limited combustible materials 

non communicating, attached buildings such as garages, boiler houses etc 

crawl spaces