S.C. Code Ann. § 40-59-77
(B) Residential specialty contractors must be qualified and experienced in the particular branches or fields of the contracting vocation in which they intend to, and do, engage.
Residential specialty contractors are not exempt from complying with county and municipal business license ordinances or other regulatory ordinances. Any county or municipality may require a residential specialty contractor to be examined and licensed in accordance with standards adopted by the county or municipality. However, a county or municipality may not adopt requirements that would require that a residential specialty contractor abide by commercial construction licensing requirements unless he is engaged in commercial construction.