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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 floor or landing is not required at the top of an interior flight of stairs, including stairs in an. enclosed garage, provided a door does not swing over the stairs. A flight of stairs shall not. have a vertical rise larger than 12 feet (3658 mm) between floor levels or landings.