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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.
Even with all these there will be enough room for people to walk and carry things. The ceiling usually isnât a factor, but over 10.5 ft will look nice. Another popular design is a 5 ft landing (the top of the stairs). This is best paired off with hallway dimensions 6 foot wide heading to the bedroom.There are many ways this space can be used.he ceiling usually isnât a factor, but over 10.5 ft will look nice. Another popular design is a 5 ft landing (the top of the stairs). This is best paired off with hallway dimensions 6 foot wide heading to the bedroom. There are many ways this space can be used.