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Best Answer: Average width of a staircase is 36 minimum. The tread (step) is no less then 10. The rise is from 7 to 8 depending on the total rise. Take the total rise and divide by 7 1/2, average step, and that gives you you # of steps. Then take total rise and divide by # of steps, this tells you the exact size of your step. Now take size of rise and X by # of steps.
minimum clear width of a stairway at or below the handrail, when one is required, is 31 Â½ inches, and 27. inches where two are required. Stair trim, stringers and other features may reduce the stairway width as. long as they do not extend beyond the allowable handrail projection. There is a width exception for. spiral stairways. The maximum riser height is 8 Â¼ inches and the minimum tread depth is 9 inches. Open risers are permitted provided the vertical opening between treads does not permit the passage of a. 4-inch-diameter sphere in stairways which have a rise exceeding 30 inches.