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 a structure or portion of a structure that is an owner-occupied personal residence if the residence is not actively used in a trade or business, held for the production of income, or held for sale or disposition in the ordinary course of the taxpayer's trade or business; and that is:
(3) "Rehabilitation expenses" means expenses incurred in the certified rehabilitation of a certified historic residential structure, including preservation and rehabilitation work done to the exterior of a historic 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 building, the value of an owner's personal labor, or the cost of personal property.
For the purposes of this subsection:
(C)