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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.
R311.5.1 Width. Stairways shall not be less than 36 inches (914 mm) in. clear width at all points above the permitted handrail. height and below the required headroom height. PHOTO 1. Handrails shall not project more than 4.5. inches (114 mm) on either side of the stairway PHOTO. 2 and the minimum clear width of the stairway at and. below the handrail height, including treads and landings, shall not be less than 31.5 inches (787 mm) where a.