S.C. Code Ann. § 48-49-50: Previously existing buildings.

Section 48-49-40 applies to buildings that existed upon the effective date of this chapter as follows:

(1) No reconstruction, alteration, or expansion may aggravate or intensify a violation by an existing building or structure that did not comply with SECTION 48-49-40 upon its effective date.

(2) No reconstruction, alteration, or expansion may cause or create a violation by an existing building or structure that did comply with SECTION 48-49-40 upon its effective date.