This Article indicates where landings are required. In general, landings must be used to provide occupants with a level area at the top and bottom of ramps and flights of stairs, where a doorway opens onto a stair or ramp, where a ramp opens onto a stair, and where a stair opens onto a ramp. They can also be used to make changes in direction or to break a long stair or ramp into shorter runs. Excessively long stairs and ramps are psychologically intimidating and physically tiring, and can be a cause of serious falls.
Where a door at the top of a stair within a dwelling unit swings away from the stair, no landing is required between the doorway and stair. A landing may be omitted at the top of an exterior stair serving a secondary entrance to a single dwelling unit or a house with a secondary suite, provided the stair contains no more than three risers and the principal door to the entrance is a sliding door or swings away from the stair (Figure 9.8.-9).
Quoted from Illustrated User's Guide - NBC2015
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