(1) Except as provided in Sentences (2), (3) and (4) and Sentence 9.9.6.6. (2), a landing shall be provided,
(a) at the top and bottom of each flight of interior and exterior stairs, including stairs in garages,
(b) at the top and bottom of every ramp with a slope greater than 1 in 50, and
(c) where a doorway opens onto a stair or ramp.
(2) Where a door at the top of a stair in a dwelling unit swings away from the stair, no landing is required between the doorway and the stair.
(3) A landing may be omitted at the top of an exterior stair serving a garage or a secondary entrance to a house or an individual dwelling unit, including an entrance from an attached garage, provided,
(a) the stair does not contain more than three risers,
(b) except as provided in Clause (c), the door is a sliding door or swings away from the stair, and
(c) where a storm or screen door is provided, it may swing over the stair if it is equipped with hardware to hold it open.
(3.1) Sentence (3) does not apply to an exterior stair serving a secondary entrance to a house that is also a main entrance to a dwelling unit in the house.
(4) A landing may be omitted at the bottom of an exterior stair or ramp provided there is no obstruction, such as a gate or door, within the lesser of the width of the stair or ramp, or,
(a) 900 mm for stairs or ramps serving a house or an individual dwelling unit, and
(b) 1 100 mm for stairs or ramps not serving a house or an individual dwelling unit.