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Existing stairs in buildings shall be permitted to remain if the rise does not exceed 81/4 inches (210 mm) and the run is not less than 9 inches (229 mm). Existing stairs can be rebuilt.
Exception: Other stairs approved by the fire code official.
1104.10.1 Dimensions for Replacement Stairs
The replacement of an existing stairway in a structure shall not be required to comply with the new stairway requirements of Section 1009 where the existing space and construction will not allow a reduction in pitch or slope.

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3406.4 Existing Buildings and Structures, Dimensions
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