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9.4.1 General
a. Means of escape
(1) Aboveground office floors
One exit staircase is permitted to serve an aboveground office floor
provided:
(a) the habitable height of the floor shall not exceed 15m;
(b) the floor shall not be located above 4th storey; and
(c) the AFA of the floor shall not exceed 200m².
(2) Underground office floors
One exit staircase is permitted to serve an office basement provided:
(a) the building is of non-combustible construction;
(b) the depth of basement storey shall not exceed 9m below the average ground level;
(c) compartment below ground shall not comprise more than one storey; and
(d) the AFA of each basement storey, including service ducts, lift shafts, toilets, staircase, etc., shall not exceed 200m2.
b. Structural fire precautions
(Not in use)
Updated 2 Sep 2024