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The minimum width of stairways is 36. Handrails may project into the required width a distance of 3 Â½ from each side of a stairway. Stringers and other projects such as trim and similar decorative features may project into the required width 1 Â½ on each side.
The minimum recommended stair width is between 34 and 36 Across the width of the tread. Some codes such as CA/OSHA specify a minimum stairway width of 24 [35].. The minimum recommended stair landing length is 36 (or a length and width sufficiently greater than the swing of the door if a wider door is present.