Permits issued for initial construction of dwellings shall be valid, without renewal, for a period of five (5) successive years. Extension of a permit beyond five (5) years without payment of an additional fee may be approved by the Chief Building Official upon a supplemental application being filed with the Chief Building Official before expiration of the five (5) year term of validity. The application shall contain a statement of facts in support of the extension including an explanation of why the work was not completed within the five (5) year period. If the Chief Building Official determines that there is sufficient reason for the construction not having been completed by the applicant during the five (5) year period, he shall issue an extension of the permit for an appropriate period within which the work can be completed, but in no event to exceed one (1) year for an extension. Application may be made for additional extensions.

Permit extensions may not be granted if building requirements applicable to the permit have changed since issuance of the permit or any prior extension thereof to the extent that allowing the work without modification will present a danger to health and safety of occupants or persons around the premises unless: