Any license issued shall be valid for the calendar year and shall expire at midnight on December 31. Any license may be renewed by the Building Inspector prior to its expiration upon proof of compliance with all applicable sections of this chapter. If a person renews his or her license prior to its expiration on December 31, said license shall be valid for the subsequent calendar year. Any person completing work under an expired license shall be considered to be unlicensed in violation of this chapter.