S.C. Code § 4-25-10
The governing body of each county in this State with a population of more than one hundred fifty thousand persons, according to the most recent official United States census, may determine those areas or sections in the county lying outside of the limits of incorporated municipalities which, by reason of density of settlement or population, or urban growth and development, residential, commercial, business, or industrial, shall come within the purview of those rules and regulations which the governing body of the county may issue pursuant to this section. The governing body may, either by resolution or ordinance, provide and prescribe reasonable rules and regulations for (a) the construction, alteration or repair of all buildings and structures of every kind, (b) the installation of electrical wiring and appliances in such buildings, (c) the licensing on the basis of their qualifications, competence and performance record, of all contractors engaged in the construction, alteration or repair of such buildings, and all electrical contractors engaged in the installation of electrical wiring and appliances in such buildings, and (d) the adoption of such other reasonable rules, regulations and codes pertaining to buildings and structures of every kind not otherwise provided by law, including but not limited to minimum housing, fire prevention, and gas codes, in any such area or section in which the governing body shall deem such rules and regulations to be necessary or proper for the protection of public health and safety in such area or section.
S.C. Code § 4-25-10