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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.
R311.5.8.l Spiral Stairs. Spiral stairways are permitted. provided the minimum. width shall be 26 inches (660 mm) with each tread. having a 71,4 inch (190 mm) minimum tread depth at. 12 inches from the narrower edge. All treads shall be. identical, and the rise shall be no more than 9th inches. (241 mm).