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R305.2 Alterations to Existing Building Basements
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Alterations to portions of existing basements shall comply with the provisions of this section.
Alterations to existing basements or portions thereof shall have a ceiling height of not less than 6 feet 4 inches (1931 mm), including beams, girders, ducts, or other obstructions.
Bathrooms shall have a minimum ceiling height of 6 feet 4 inches (1931 mm) at the center of the front clearance area for water closets, bidets, or sinks. A shower or tub equipped with a showerhead shall have a minimum ceiling height of 6 feet 4 inches (1931 mm) above a minimum area 30 inches (762 mm) by 30 inches (762 mm) at the wall where the showerhead is placed. The ceiling may have slopes or soffits that do not infringe on the height required for the plumbing fixture.
Alterations to existing basement stairways shall have a minimum headroom in all parts of the stairway not less than 6 feet 4 inches (1931 mm) measured vertically from the sloped line adjoining the tread nosing or from the floor surface of the landing or platform on that portion of the stairway.
Exception: Where the nosings of treads at the side of a flight extend under the edge of a floor opening through which the stair passes, the floor opening shall be allowed to project horizontally into the required headroom a maximum of 43/4 inches (121 mm).
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