Roof space conversions to habitable accommodation

Where a roof space is to be converted to a habitable accommodation room or kitchen, an automatic fire detection and fire alarm in accordance with paragraph 2.23 and or 2.24 should be provided within the new habitable room or kitchen; the circulation spaces from the new room to the final exit; and to any habitable room or kitchen opening on to the circulation spaces leading from the new room to the final exit and either – (a) the relevant provisions of paragraphs 2.4 to 2.15 should apply; or (b) where the existing dwellinghouse has two storeys the provisions in paragraphs 2.18 to 2.22 may be followed provided that the new storey does not – (i) exceed 50 m2 in floor area; or (ii) contain more than two habitable rooms.