Cicero — Part II Ch. 46 Art. X Minimum Housing Code § 46-474

No person shall occupy as owner-occupant or let to another for occupancy any dwelling or dwelling unit, for the purpose of living therein, that does not comply with the following: (1)
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 ten percent of the floor area of such room. Whenever walls or other portions of structures face a window of any such room and such light-obstruction structures are located less than three feet from the window and extend to a level above that of the ceiling of the room, such a window 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 such room, the total window area of such skylight shall equal 15 percent of the total floor area of such room.
(2) Every habitable room shall have at least one window or skylight, which can easily be opened, or such other device as will adequately ventilate the room. The total of openable window area in every habitable room shall be equal to at least 45 percent of the minimum window area size or minimum skylight-type window size, as required in subsection (1) of this section, except where there is supplied some other device affording adequate ventilation.
(3) Every bathroom and water closet compartment shall comply with the light and ventilation requirements for habitable rooms contained in subsections (1) and (2) of this section, except that no window or skylight shall be required in an adequately ventilated bathroom and a water closet compartment equipped with a ventilation system.
(4) Every habitable room of such dwelling shall contain at least two separate floor- or wall-type electric convenience outlets or one such convenience outlet and one supplied ceiling-type electric light fixtures. Every water closet compartment, bathroom, laundry room, furnace room, and public hall shall contain at least one supplied ceiling- or wall-type electric light fixture. Every such outlet and fixture shall be properly installed and shall be connected to the source of electric power in a safe manner.
(5) Every dwelling shall have heating facilities that are properly installed, maintained in safe and good working condition, and capable of safely and adequately heating all habitable rooms, bathrooms, and water closet compartments in every dwelling unit located therein as provided in section 46-331 .
(6) Every public hall and stairway in every multiple dwelling containing five or more dwelling units shall be adequately lighted at all times. Every public hall and stairway in a structure devoted solely to dwelling occupancy and containing not more than four dwelling units may be supplied with conveniently located light switches, controlling an adequate lighting system which may be turned on when needed, instead of full-time lighting.
(7) During that portion of each year from May 1 through October 31, for protection against mosquitoes, flies and other insects, every door opening directly from a dwelling unit outdoor space shall have supplied screens and a self-closing device, and every window or other device with openings to outdoor space used or intended to be used for ventilation shall likewise be supplied with screens.
(8) Every basement or cellar window used or intended to be used for ventilation and every other opening to a basement which might provide an entry for rodents shall be supplied with a screen or such other device as will effectively prevent their entrance.