S.C. Code § 5-25-1340
No person may convey a title to real estate which includes a dwelling to which the article applies pursuant to Section 5-25-1310(A) or transfer possession of a building to which this article applies pursuant to Section 5-25-1310(A) unless smoke detectors have been installed and are functioning in accordance with this article. The purchaser may inspect the detectors at any reasonable time prior to closing to verify that they have been properly installed and are functioning in accordance with this article. The seller shall provide to the purchaser at closing an affidavit stating that the smoke detectors have been installed and are functioning in accordance with this article. Compliance with this section relieves the seller of any further liability after closing with respect to the performance of the smoke detectors. Violation of the provisions of this section does not affect the validity of the conveyance.
S.C. Code § 5-25-1340