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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.
Although a spiral staircase cannot be used as the main access to an area of your home (per building code requirements), it can be a convenient way to get from one level to another, and, it will take half the space. Arke stairs has spiral and modular stair kits for the do-it-yourselfer.he center column and two treads make a total diameter of 68 inches. The circumference of the stairway is the diameter in inches multiplied by 3.1416. So, 68 inches x 3.1416 = 210 inches (rounded to the nearest inch). Since we will make 14 steps, 210Ã·14=15 inches.