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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.
For the safety reasons and for the comfort of usage, stair measurements are recommended to follow some guidelines: 1  The run length should be 9 inches (23 cm) or longer for enough foot space. 2  The riser height should be 8.25 inches (21cm) or lower. The comfortable size of handrail diameter is between 1.25 and 2.68 inches (3.2 to 6.8 cm). 2  Doors are normally not allowed to swing over steps. 3  The arc of doors should be on the landing or floor completely.