![]() The run of each step is measured from the face of a vertical riser to the face of the next riser up.The tread depth of a step is measured from the edge of the bullnose to the face of the vertical riser if the steps have no bullnose, it is the same as the run otherwise it is the run plus the extent of one bullnose.In Ontario, the allowable range for a rise is 125mm (4-7/8”) to 200mm (7-7/8”). A person using the stairs would move this distance vertically for each step they take. It is not the physical height of the riser the latter excludes the thickness of the tread. The rise of each step is measured from the top of one tread to the top of the next tread.The following stair measurements are important: The measurements of a stair, in particular the rise (height) and run (depth) of the steps, should remain consistent throughout the stairs.
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