Plan check applications expire 18 months after the plan check fees are paid. However, within 30 days of its expiration, an extension of time to extend a permit application may be filed with the Department using a Request for Modification of Building Ordinances. The request may be filed with any Plan Check office, preferably with the office where the plan was reviewed. A fee shall accompany each request.

Generally speaking, any changes to Department-approved plans shall be approved by the plan review engineer who reviewed and issued the permit. 

Sometimes, the changes can be handled over the counter on the same day it is brought in; other times, the changes may need to be resubmitted for further review with an additional plan review fee. In either case, it is always a good idea to first call the plan review engineer who issued the permit and ask for his/her help.