S.C. Code § 4-1-20
Whenever the citizens of any county desire to move the courthouse they shall file a petition to that effect stating the point to which the courthouse is proposed to be removed and signed by one third of the qualified electors of such county with the Governor, who shall within twenty days after the filing order an election in such county to be held within sixty days, at which election the electors shall vote for or against the proposed removal. The commissioners of election for such county shall appoint managers of each precinct in the county and furnish them with the necessary boxes and registration books, which the officers of registration may furnish the commissioners. Such election shall be conducted as general elections in this State, and all electors qualified to vote at general elections shall be entitled to vote thereat. The commissioners of election of such county shall receive the returns of the managers, tabulate the vote and declare the result. If two thirds of the qualified voters voting in such election vote in favor of such removal the governing body of the county shall take the necessary steps to remove the courthouse and public records of such county to the place designated.
S.C. Code § 4-1-20