After a permit has been issued, no changes or deviations from the terms of the application, plans and specifications or permit, except where changes or deviations are clearly permissible under the state building code, shall be made, until specific written approval of the changes or deviations has been obtained from the Inspection Department.
(G.S. § 160A-419) (1988 Code, § 150.23) Penalty, see § 10.99