S.C. Code § 5-37-140
Upon the confirmation of an assessment, if any, the governing body shall mail a written notice to all persons who have filed written objections as hereinabove provided of the amount of the assessment finally confirmed. Such property owner may appeal such assessment only if he shall, within twenty days after the mailing of the notice to him confirming the assessment, give written notice to the governing body of his intent to appeal his assessment to the court of common pleas of the county in which the property is situate; but no such appeal shall delay or stay the construction of improvements or affect the validity of the assessments confirmed and not appealed. Appeals shall be heard and determined on the record in the manner of appeals from administrative bodies in this State.
S.C. Code § 5-37-140