(a) Size.
(1) Habitable space shall have a minimum ceiling height of seven feet six inches over fifty percent of the floor area, and the floor area where the ceiling height is less than five feet shall not be considered in computing floor area.
(2) A dwelling unit shall contain at least one habitable room having a minimum of 150 square feet of floor area and a minimum horizontal dimension of ten feet.
(3) Kitchens shall have a minimum of sixty square feet of floor area and other habitable spaces shall contain not less than eighty square feet of floor area and shall have a minimum horizontal dimension of seven feet.
(4) Every alcove less than sixty square feet in area, except a cooking space or foyer, shall be deemed to be a part of a habitable room. The area of the opening in the dividing partition between the alcove and the room shall be at least eighty percent of the wall area of such partition, measured on the alcove side, but not less than forty square feet. The depth of such alcove shall not exceed half its width. The floor area of the alcove shall be added to the floor area of the room in determining light and ventilation requirements for the room. An alcove with an area of sixty square feet or more, but less than the required area of a habitable room, shall be separately lighted and ventilated as required for habitable space.
(b) Cellars and Basements. Cellars shall not be deemed habitable space and basements shall not be deemed habitable space where required windows are located only on one wall.
(c) Light and Ventilation.
(1) Habitable space shall be provided with natural light through one or more windows, skylights, transparent or translucent panels, or any combinations thereof, that face directly on legal open spaces at least six inches above the adjoining finished grade or are above a roof. The amount of light shall be equivalent to that transmitted through clear glass equal in area to ten percent of the floor area of the habitable space.
(2) Habitable space shall be provided with artificial light.
(3) Habitable space shall be provided with natural ventilation through openable parts of windows or other openings in exterior walls that face legal open spaces above the adjoining finished grade or above a roof or through openable parts of skylights, providing total clear ventilation area equal to not less than five percent of the total floor area of each habitable space.
(4) Habitable space may also be provided with mechanical ventilation, in addition to natural ventilation.
(d) Miscellaneous Requirements.
(1) Dwelling units shall be separated from each other and from other spaces outside the dwelling unit.
(2) Sleeping rooms within dwelling units shall be separated from each other and from other spaces outside the sleeping rooms to provide privacy.
(3) Lodging units shall be separated from each other and from other spaces outside the lodging units.
(4) A communal kitchen or dining room in a lodging house shall be accessible to the occupants sharing such kitchen or dining room without going through a dwelling unit or lodging unit of another occupant.