No dwelling unit containing two or more sleeping rooms shall have a room arrangement such that access to a bathroom or water closet compartment intended for use by occupants of more than one sleeping room can be gained only by going through another sleeping room, nor shall the room arrangement be such that access to a sleeping room can be gained only by going through another sleeping room. A bathroom or water closet compartment shall not be used as the only passageway to any habitable room, hall, basement or cellar or to the exterior of any dwelling unit.
(`89 Code, § 27.290)