If the work described in any zoning certificate has not begun within six (6) months from the date of issuance thereof, said certificate shall expire; it shall be revoked by the Zoning Inspector, and written notice thereof shall be given to the persons affected. If the work described in any zoning certificate has not been substantially completed within one (1) year of the date of issuance thereof, as described in Section 1141.05, said certificate shall expire and be revoked by the Zoning Inspector, and written notice thereof shall be given to the persons affected, together with notice that further work as described in the cancelled certificate shall not proceed unless and until a new zoning certificate has been obtained or an extension granted.