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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 following spatial requirements apply to stairs: ï· Minimum width above the handrail - 36 inches. ï· The minimum clear width from the handrail height to the treads is 31 Â½ inches for stairs with rails on one. side and 27 inches for stairs with rails on both sides. ï· Open risers are not permitted when the total rise of the stair exceeds 30 inches unless the open space is.