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Office of the Revisor of Statutes

This is an historical version of this rule part. Also view the current version.


IRC Section R305.1 is amended to read as follows:

R305.1 Minimum height. Habitable rooms, hallways, corridors, bathrooms, toilet rooms, and basements shall have a ceiling height of not less than 7 feet (2134 mm). The required height shall be measured from the finish floor to the lowest projection from the ceiling. Areas or rooms with ceiling heights less than 7 feet (2134 mm) are considered crawl spaces.


1. Beams and girders spaced not less than 4 feet (1219 mm) on center may project not more than 6 inches (152 mm) below the required ceiling height.

2. Not more than 50 percent of the required floor area of a room or space is permitted to have a sloped ceiling less than 7 feet (2134 mm) in height with no portion of the required floor area less than 5 feet (1524 mm) in height.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13


27 SR 1475; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

February 23, 2009