Minimum Ceiling Height

Habitable spaces, hallways, and portions of of basements containing these spaces shall have a ceiling height of not less than 7 feet (2134mm). 

Exception: For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524mm), and not less than 50% of the required floor area shall have a ceiling height of not less than 7 feet (2134mm).  Source, 2021 IRC, R305.1.
Habitable spaces, hallways, and portions of of basements containing these spaces shall have a ceiling height of not less than 7 feet (2134mm). Exception: For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524mm), and not less than 50% of the required floor area shall have a ceiling height of not less than 7 feet (2134mm). Source, 2021 IRC, R305.1.

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