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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.
A flight of stairs shall not. have a vertical rise larger than 12 feet (3658 mm) between floor levels or landings. The. width of each landing shall not be less than the width of the stairway served. Every landing. shall have a minimum dimension of 36 inches (914 mm) measured in the direction of travel. R311.3 Floors and landings at exterior doors. There shall be a landing or floor on each side of each exterior door. The.