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It applies to stair treads, but a building official could consider the decking on a landing. The minimum size for a landing is 3 feet by 3 feet or the width of the stair .
Build the stairs at least 3 feet wide with either open or closed stringers on the. Make treads from the same material as your decking and with the same spacing.
For example, if you are building stairs to go up to a deck, and you measure 3 feet (0.91 m) from. If your stairs have a long rise and run, you can install landings.
Every interior and exterior stairs, including tub access steps but excluding. landings shall be at least as wide as the stairs and shall measure al least 3 feet in