The Residential Building Code has nothing to do with the Permitting requirements of the Local Jurisdiction.
The Local Jurisdiction may have adopted the entire Code or just parts of it. (It's usually easier to just adopt the entire Code)
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This post, like several others, proves that you are completely ignorant of the process.
In NC, all county building inspections departments are overseen by the State Department of Insurance. The NCDOI has adopted the International Building Code, with State amendments.