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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.
Modern homes tend to have standard-size joinery and most internal doors are the same size. The standard is usually 1981 mm x 762 mm (6ft 6in x 2ft 6in), though there are a variety of other sizes available, which are intended for wider and narrower openings such as under the stairs or 'walk-in' cupboards and the WC.