S.C. Code § 6-35-100
The governing body shall collect from the owner, upon the issuance of any obligations secured by assessments, an improvement fee in an amount equal to four percent of the aggregate par value of such obligations. The improvement fee must be used to construct improvements or collective improvements, as described in Section 6-35-110, in a service area that is related to and serves the district. The governing body may contract with the owner, or with a third party, for the construction of the improvements. The improvements must be part of the improvement plan. A governing body imposing an improvement fee must not impose any additional fee upon properties located within a district to recover any capital costs paid for from assessments which are imposed upon properties located within a district as provided in this chapter.
S.C. Code § 6-35-100