(1) Except in basements of houses, each unsprinklered basement exceeding 25 m in length or width shall be provided with direct access to the outdoors to at least one street.
(2) Access required in Sentence (1) is permitted to be provided by a door, window or other means that provides an opening not less than 1 100 mm high and 550 mm wide, the sill height of which shall not be more than 900 mm above the floor.
(3) Access required in Sentence (1) is also permitted to be provided by an interior stair accessible from the outdoors.