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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.
For example, an outdoor staircase with five steps is going to cost a lot less than a winding indoor staircase with 24 steps. Nonetheless, the average staircase cost is $2,100, with most homeowners paying between $1,200 and $3,000. Interior Stairs Cost. Of course, there are interior stairs and exterior stairs. Since interior stairs generally consist of more steps, theyâre typically more expensive than exterior stairs.