Every dwelling unit shall contain at least 150 sq ft (13.9m2) of floor space for the first occupant thereof and at least an additional 100 sq ft (9.3m2) of floor area per additional occupant. The floor area shall be calculated on the basis of the total area of all habitable rooms. 306.2 Required Space In Sleeping Rooms
In every dwelling unit, every room occupied for sleeping purposes by one occupant shall contain at least 70 sq ft of floor space and every room occupied for sleeping purpose by more than one occupant shall contain at least 50 sq ft (4.6 m2) of floor space for each occupant thereof. 306.3.1 Minimum Ceiling Height
Habitable (space) rooms other than kitchens, storage rooms and laundry rooms shall have a ceiling height of not less than 7 ft (2134mm). Hallways, corridors, bathrooms, water closet rooms and kitchens shall have a ceiling height of not less than 7 ft (2134mm) measured to the lowest projection from the ceiling.