When required. Within any district, a court is required wherever any room in which people live, sleep, work or congregate cannot be adequately lighted or ventilated directly from a street or a yard on the same lot to afford natural light and ventilation to such room, but no court need extend below the floor level of the room or rooms it is required to serve.

Required size. Within any district, the minimum width of an outer court shall be in the ratio of three inches to each foot of its height, and not less than six feet; and of an inner court, in the ratio of four inches to each foot of its height, and not less than eight feet. No outer court shall be longer than twice its width and no inner court shall be shorter than twice its width.

Accessibility. Every court that is not otherwise accessible at its lowest level shall be made accessible by a door or other means to enable it to be properly cleaned.