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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.
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.