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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.
minimum clear width of a stairway at or below the handrail, when one is required, is 31 Â½ inches, and 27. inches where two are required. Stair trim, stringers and other features may reduce the stairway width as. long as they do not extend beyond the allowable handrail projection. There is a width exception for. spiral stairways. The maximum riser height is 8 Â¼ inches and the minimum tread depth is 9 inches. Open risers are permitted provided the vertical opening between treads does not permit the passage of a. 4-inch-diameter sphere in stairways which have a rise exceeding 30 inches.