No permit shall be issued until suitable plans or a description of the work to be done have been submitted to the Plumbing Inspector, and have been approved by him.  If the work is not begun under the approved plans within three months of the date of approval such approval shall be deemed to have expired by limitation.  The Plumbing Inspector shall use his discretion and his discretion shall be final in regard to work in old or new buildings, which cannot be governed by the rules, and he shall have access at all times to all buildings and premises in carrying out the provisions of this chapter.
(1955 Code §979.09)