S.C. Code Ann. § 41-16-80

On and after the effective date of regulations relating to alterations, detailed plans of each facility to be altered must be submitted to the Director, together with an application for an alteration permit, on forms to be furnished or approved by the Director. Repairs or replacements necessary for normal maintenance are not alterations and may be made on existing installations with parts equivalent in material, strength, and design to those replaced, and no plans or specifications or application need be filed for the repairs or replacements. However, nothing in this section authorizes the use of any facility contrary to an order issued pursuant to Section 41-16-110.