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All habitable rooms (i.e. rooms for living, sleeping, eating or cooking) shall be provided with natural light by means of exterior glazed openings with an area not less than 1/10 of the floor area of such rooms with a minimum of 10 square feet.
The Building Code of Australia has a minimum requirement for natural light to a habitable room. It is calculated based on the floor area of a habitable room. A window opening is required that has an area 10% of the floor area of the room.