(a) Regulations pertaining to the use of land or structures and physical development within each of the zoning districts, as adopted as a standard zoning district and as shown on the Zoning District Map, are established and adopted.
(b) Nothing in this Zoning Code shall be construed to prohibit the rendition in residential zones of traditional domestic services such as laundry, ironing, sewing or alterations, baking or decorating cakes, babysitting, or the use of a dwelling by those persons who may be sales agents or representatives, and do not display or exhibit a business use to the public, and where no employees or customers come to the home for the purpose of transacting business, provided such use:
(1) Is incidental and subordinate to the primary residential use.
(2) Does not involve any activities outside the principal building including the storage of materials or products.
(3) Employs no person not a resident of the premises.
(4) Requires no structural alterations or additions, provided the garage may be used so long as the activity does not preclude the storage in said garage of the number of vehicles for which it was designed.