S.C. Code Ann. § 23-45-120
Nothing in this chapter limits the power of a municipality, county, or the State to regulate the quality and character of work performed by contractors, through a system of permits, fees, and inspections which are designed to assure compliance with, and aid in the implementation of, state and local laws for the protection of the public health and safety. Nothing in this chapter limits the power of a municipality, county, or the State to adopt any system of permits requiring submission to and approval by the municipality, county, or the State, of plans and specifications for work to be performed by contractors before commencement of the work. The official authorized to issue building or other related permits shall ascertain that the fire protection sprinkler contractor is licensed by requiring evidence of a valid sprinkler contractor's license.