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The minimum unit rise for a normal staircase is usually 4", and the maximum, except for service-stairs (stairs that aren't used often) is 7". Service stairs can go as high as 8", but this is considered a really steep staircase. The most comfortable range for the average staircase and the average person is between 6 and 6-½ inches.

Source:  Backwoodshome.com

11 years ago. Rating: 1
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