Home occupations, provided that such occupation is incidental to the use of the premises for residential purposes, does not involve any structural alteration of the building or any external construction not customary in dwellings, is not conducted in a detached accessory building, that no article is sold or offered for sale on the premises except such as is produced by such occupation, that no stock in trade is kept or sold, that no mechanical equipment is used other than such as is permissible for purely domestic purposes and that no person other than a member of the immediate family living on the premises is employed.

Professional offices, when not more than one such office is established in any one dwelling, provided that such office shall be incidental to the residential occupation. Not more than 50 per cent of the floor area of only 1 story of a dwelling unit shall be occupied by such office and not more than 2 persons not members of the family may be employed in such office.