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R305.2.1 Minimum Ceiling Height, Existing Buildings
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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.