Building plan checks with no activity expire after 180 days. A building permit is valid for 360 days from the issuance date. In addition, the Chief Building Official may grant a 180- day extension. In most cases, a permit will not expire unless the applicant has failed to call for an inspection and show progress on the project for a 360-day period.
Once a permit is expired, you may be required to re-initiate the permit process and resubmit payment for all applicable fees.