IBC Chapter Ten - Means of Egress
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1009.1 Stairway Width
Code Excerpt:
1009.1 Stairway width.
The width of stairways shall be determined as specified in Section 1005.1, but such width shall not be less than 44 inches (1118 mm). See Section 1007.3 for accessible means of egress stairways.
Exceptions:
1. Stairways serving an occupant load of 50 or less shall have a width of not less than 36 inches (914 mm).
2. Spiral stairways as provided for in section 1009.9.
3. Aisle stairs complying with Section 1024.
4. Where a stairway lift is installed on stairways serving occupancies in Group R-3, or within dwelling units in occupancies in Group R-2, both as applicable in Section 101.2, a clear passage width not less than 20 inches (508 mm) shall be provided. If the seat and platform can be folded when not in use, the distance shall be measured from the folded position.
National Partitions:
As a standard we build our stairs with 36" clear width to comply with
this section and wider when requested to meet higher occupancies or
other circumstances.
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