S.C. Code § 23-43-100
Modular building units certified pursuant to this chapter are considered to comply with the requirements of all laws, ordinances, and regulations of this State or of local governments which govern the matters within the scope of the approval and certification applicable to modular building units, including those bearing upon technologies, techniques, and materials, or the safety of buildings or building components. Local codes enforcement agencies shall issue building permits for certified modular building units, prior to installation, and issue certificates of occupancy after they have been installed and inspected pursuant to this chapter. Any modular building unit found not to comply with this chapter must be brought into compliance before the certificate of occupancy is issued. In the absence of a local building official, the certificate must be issued by the chief administrative officer of the local government.
S.C. Code § 23-43-100