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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.
Building Code Questions-Stairs & WC. Especially as more homes are being built with higher ceilings -- making longer stair runs a necessity -- I wonder if there is code to address how long an uninterrupted run is safe (without landings).'ve recently seen a couple homes with what appear to be lethal stairs -- a 9, 10, 12 foot straight run. This is also common in office buildings with escape stairs in a stairwell.