(1)
A building classified as Group A, Division 2 is permitted to be of combustible construction or noncombustible construction used singly or in combination, provided
(a)
it is not more than 1 storey in building height, and
(b)
except as permitted by Sentence (2), it has a building area not more than
(i)
400 m
(ii)
500 m
(iii)
600 m
(2)
In a building referred to in Sentence (1) without a basement, the building area limits of Sentence (1) are permitted to be doubled provided a fire separation with a fire-resistance rating not less than 1 h is used to separate the building into fire compartments, each one of which does not exceed the area limits of Clause (1)(b).