No Zoning Permit shall be required in any of the following instances: for repairs or improvements to an existing building not involving a change in the use of a structure, or an increase in the floor area of the structure, except in compliance with Section 35-190, Architectural Control, of this Chapter and other applicable chapters of this Municipal Code; provided, however, that any work not requiring a permit shall comply with the applicable setback, yard, height and other requirements of this Chapter. No zoning permit shall be required for the necessary and customary construction, reconstruction or maintenance of overground or underground public utility service lines and mechanical appurtenances; except in compliance with floodplain districts (see Chapter 37). No permit shall be required for gardening accessory to a principal use. See also Chapters 36 to 39 for specific uses.