(A) Required space in dwelling unit. Every dwelling unit shall contain at least 150 square feet of floor space for the first occupant thereof and at least 100 additional square feet of floor area per additional occupant. The floor area shall be calculated on the basis of the total area of all habitable rooms.
(B) Required space in sleeping rooms. In every dwelling unit of two or more rooms, every room occupied for sleeping purposes by one occupant shall contain at least 70 square feet of floor space, and every room occupied for sleeping purposes by more than one occupant shall contain at least 50 square feet of floor space for each occupant thereof.
(C) Minimum ceiling height.
(1) Habitable (space) rooms other than kitchens, storage rooms, and laundry rooms shall have a ceiling height of not less than seven feet. Hallways, corridors, bathrooms, water closet rooms, and kitchens shall have a ceiling height of not less than seven feet measured to the lowest projection from the ceiling.
(2) If any room in a building has a sloping ceiling, the prescribed ceiling height for the room is required in only one-half the area thereof. No portion of the room measuring less than five feet from the finished floor to the finished ceiling shall be included in any computation of the minimum area thereof.
(D) Occupancy of dwelling unit below grade. No basement or cellar space shall be used as a habitable room or dwelling unit unless:
(1) The floor and walls are impervious to leakage of underground and surface runoff water and are insulated against dampness;
(2) The total of window area in each room is equal to at least the minimum window area size as required in § 151.23(A) of this subchapter;
(3) The required minimum window area is located entirely above the grade of the ground adjoining that window area; and
(4) The total of openable window area in each room is equal to at least the minimum as required under § 151.23(B) of this subchapter, except where there is supplied some other device affording adequate ventilation.
(Prior Code, § 151.26) Penalty, see § 151.99