Any person desiring to obtain a contractor's or a percolation tester's license shall apply to the Health Officer on forms provided for that purpose by the Health Officer. No application shall be approved to a person whose license previously issued is under suspension or revocation, or who is not eighteen (18) years of age, or who has failed to sign the application and, where applicable, has failed to pass an examination. A license fee as designated in the Table of Fees shall be payable upon application for a license, issued under this Subdivision.