20.1 For requirements regarding lighting and ventilation for different uses and occupancies, reference shall be made to Part 8 ‘Building Services’, Section 1 ‘Lighting and Natural Ventilation’ of the Code.
20.1.1 Lighting and Ventilation of Rooms
Rooms shall have, for the admission of light and air, one or more openings, such as windows and ventilators, opening directly to the external air or into an open Verandah.
20.1.2 Notwithstanding the area of openings obtained through 20.1, the minimum aggregate area (see Notes 1 to 3) of such openings, excluding doors inclusive of frames, shall be not less than,
a) one-tenth of the floor area for hot-dry climate;
b) one-sixth of the floor area for warm-humid climate;
PART 3 DEVELOPMENT CONTROL RULES AND GENERAL BUILDING REQUIREMENTS
c) one-eighth of the floor area for temperate and composite climate; and
d) one-twelfth of the floor area for cold climate.
1 If a window is partly fixed, the openable area shall be counted. 2 No portion of a room shall be assumed to be lighted, if it is more than 7.5 m away from the opening assumed for lighting that portion.
3 The area of openings as given in (a) to (d) above shall be increased by 25 percent in the case of a kitchen [see 12.3.3(d)].