(A) Size. Every habitable room shall have at least one window or skylight facing directly to the outdoors. The minimum total window area, measured between stops, for every habitable room shall be 8% of the floor area of that room. Whenever walls or other portions of structures face a window of any room and those light-obstruction structures are located at least three feet from the window and extend to a level above that of the ceiling of the room, such a window shall not be deemed to face directly to the outdoors and shall not be included as contributing to the required minimum total window area. Whenever the only window in a room is a skylight-type window in the top of that room, the total window area of the skylight shall equal at least 15% of the total floor area of the room.
(B) Habitable rooms.
(1) Every habitable room shall have at least one window or skylight which can be easily opened, or any other device as will adequately ventilate the room. The total of openable window area in every habitable room shall equal at least 45% of the minimum window area size or minimum skylight-type window size, as required, or shall have other approved, equivalent ventilation.
(2) Year-round mechanically ventilating conditioned air systems may be substituted for windows, as required herein, in rooms other than rooms used for sleeping purposes. Window-type air conditioning units are not included in this exception.
(C) Bathroom. Every bathroom shall comply with the light and ventilation requirements for habitable rooms except that no window or skylight shall be required in adequately ventilated bathrooms equipped with an approved ventilating system.
(D) Electric lights and outlets required. Where there is electric service available to the building structure, every habitable room or space shall contain at least two separate and remote convenience outlets and bedrooms shall have, in addition, at least one wall switch controlled ceiling or wall-type light fixture. In kitchens, three separate and remote convenience outlets shall be provided, and a wall or ceiling type light fixture controlled by a wall switch shall be required. Every hall, water closet compartment, bathroom, laundry room, or furnace room shall contain at least one electric fixture. In bathrooms, the electric light fixture shall be controlled by a wall switch. In addition to the electric light fixture in every bathroom and laundry room, there shall be provided at least one convenience outlet. Every outlet and fixture shall be properly installed, shall be maintained in good and safe working condition, and shall be connected to the source of electric power in a safe manner.
(E) Light in public halls and stairways. Every common hall and inside stairway in every building, other than one-family dwellings, shall be adequately lighted at all times with an illumination of at least one footcandle intensity at the floor in the darkest portion of the normally traveled stairs and passageways.
(Prior Code, § 151.23) Penalty, see § 151.99