S.C. Code Ann. § 12-6-3535
(B) A taxpayer who is not eligible for a federal income tax credit under Section 47 of the Internal Revenue Code and who makes rehabilitation expenses for a certified historic residential structure located in this State is allowed to claim a credit against the tax imposed by this chapter. The amount of the credit is twenty-five percent of the rehabilitation expenses. To claim the credit allowed by this subsection, the taxpayer must attach to the return a copy of the certification obtained from the State Historic Preservation Officer verifying that the historic structure has been rehabilitated in accordance with this subsection, along with all information that the Department of Revenue determines is necessary for the calculation of the credit provided by this subsection.
(1) "Certified historic residential structure" means an owner-occupied residence that is:
(3) "Rehabilitation expenses" means expenses incurred by the taxpayer in the certified rehabilitation of a certified historic residential structure that are paid before the credit is claimed including preservation and rehabilitation work done to the exterior of a certified historic residential structure, repair and stabilization of historic structural systems, restoration of historic plaster, energy efficiency measures except insulation in frame walls, repairs or rehabilitation of heating, air-conditioning, or ventilating systems, repairs or rehabilitation of electrical or plumbing systems exclusive of new electrical appliances and electrical or plumbing fixtures, and architectural and engineering fees.
"Rehabilitation expenses' do not include the cost of acquiring or marketing the property, the cost of new construction beyond the volume of the existing certified historic residential structure, the value of an owner's personal labor, or the cost of personal property.
(5) "Owner-occupied residence" means a building or portion of a building in which the taxpayer has an ownership interest, in whole or in part, in fee, by life estate, or as the income beneficiary of a property trust, that is, after being placed in service, the residence of the taxpayer and is not:
For the purposes of subsections (B) through (F):
(C)