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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.
1 Minimum clear walking path of 26 inches. 2  A 5-foot diameter or larger stair will provide this width. 3  Each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge. 4  All treads will be identical. 5  The tread rise shall not be more than 9 1/2 inches high.