Permitted accessory uses. In the R-220, R-110, R-22 and R-15 Residence Districts, uses customary and incidental to the permitted principal use on the same lot, such as private residential garages, tennis courts, swimming pools, greenhouses, boathouses, and bathhouses, shall be permitted. Such uses shall be restricted to the use and enjoyment of the owner or occupant of the principal use and his guests and shall not be rented or open to use by the general public, except that a full-time employee engaged solely in the rendition of services to the owner or occupant of the principal residence on the same lot shall be permitted. Only one accessory building may be used for such residence purposes. Such uses shall not include any home occupation or home professional offices nor any business or industry or any driveway or walkway giving access thereto, nor any sign, billboard or display except as provided for in this chapter.