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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.
Spiral staircases fall under totally different code requirements. The minimum width of a spiral staircase is 26 inches, 10 inches less than a typical or winder staircase. Spiral stairs have no minimum tread depth at the narrow end and a minimum of 7-1/2 inches of tread depth at a point 12 inches from the inside edge.