S.C. Code Ann. § 27-40-640 – Landlord's noncompliance as defense to action for possession or rent

(a) In an action for possession based upon nonpayment of the rent or in an action for rent concerning a period when the tenant is in possession, the tenant may rely on the rental agreement or the provisions of this chapter to assert defenses and to counterclaim for any amount recoverable thereunder. If the defense or counterclaim by the tenant is without merit and is not raised in good faith, the landlord may recover, in addition to actual damages, reasonable attorney's fees.
(b) Notwithstanding the provisions of subsection (a), a tenant is considered to have waived violation of a landlord's duty to maintain the premises as set forth by the rental agreement or violation of the landlord's duties under Section 27-40-440 as a defense in an action for possession based upon nonpayment of rent or in an action for rent concerning a period where:
1. (1) the landlord has no notice of the violation of the duties fourteen days before rent is due for violations of Section 27-40-440 involving services other than essential services; or
2. (2) the landlord has no notice before rent is due which provides a reasonable opportunity to make emergency repairs necessary for the provision of essential services.
(c) In an action for rent concerning a period when the tenant is not in possession, he may assert defenses and counterclaims as provided in subsection (a) but is not required to pay any rent as required by Section 27-40-790.