10-1-6: DURATION OF PERMIT:
   A.   Duration Of Minor Permits: A minor permit shall be any permit issued for an accessory use listed in section 11-14-4, “Table 1, Permitted Obstructions Of Required Yards”, of this Code. A minor permit shall expire and become invalid if a substantial construction start is not made within ninety (90) days after the issuance of said permit, and/or if construction is not fully completed within six (6) months after the issuance of said permit. In any of the aforesaid cases, no further construction shall be permitted until a new application has been submitted and approved and all fees have been paid in connection with the application for said minor permit.
   B.   Duration Of Major Permits: A major permit shall be any permit not classified as a minor permit. A major permit shall expire and become invalid if a substantial construction start is not made within sixty (60) days after the issuance of said permit, construction is not completed, and a final inspection passed (Temporary Occupancy Agreement issued), within one year after the issuance of said permit, or, if the building whose construction is authorized thereby has not had and passed a final inspection and a Certificate of Occupancy is not issued within two (2) years after the issuance date of said permit. In any of the aforesaid cases, no further construction shall be permitted until a new application has been submitted and approved and all fees have been paid in connection with the application for said major permit.
   C.   Building Permit Extensions: A building permit extension may be granted by the Director subsequent to the payment of the fees specified in section 10-1-4 of this chapter.
   D.   Number Of Building Permit Extensions: No more than one permit extension shall be granted per building permit.
(1987 Code § 7-5)