Subsection B6 – Buildings with Only

Subsection B6 – Buildings with Only One Required StaircaseClause B6.1Pursuant to Clause B8.1, no building will be permitted to have only one required staircase unless such building complies with the following requirements:(a) The building does not exceed 6 storeys in height and the level of the floor of the uppermost storey is not more than 17m above the level of the ground at the discharge point of the required staircase;(b) No room or storey of the building may be used for any occupancy other than domestic or offices, except the ground storey may be used for the purposes of a shop or carparking space provided that the requirements for required staircase enclosures in Part C are complied with;(c) In the case of a building in which the level of the highest floor is not more than 13m above ground level the usable floor area of any storey above the ground storey should not exceed 250m2; and(d) In the case of a building in which the level of the highest floor is more than 13 m above ground level:(i) the usable floor area of any storey above the ground storey should not exceed 150m²;(ii) access to the required staircase at each storey should be through a protected lobby. Such lobby should be designed as a common area and an integral part of the required staircase so that it could not be readily incorporated as part of any adjacent unit(s) of accommodation;(iii) the required staircase should be continued to the roof;(iv) there should be available on the roof an area of flat surface for refuge of not less than 0.5 m2 per person based on the total population of the building above ground storey determined according to Table B1. Such flat roof should be accessible directly from the required staircase, clear of any obstruction, and is so positioned that it is readily accessible for rescue purposes; and(v) the roof should comply with the requirements in Subsection C12 of Part C.