S.C. Code Ann. § 6-29-1180

In circumstances where the land development regulations adopted pursuant to this chapter require the installation and approval of site improvements prior to approval of the land development plan or subdivision plat for recording in the office of the county official whose duty it is to accept and record the instruments, the developer may be permitted to post a surety bond, certified check, or other instrument readily convertible to cash. The surety must be in an amount equal to at least one hundred twenty-five percent of the cost of the improvement. This surety must be in favor of the local government to ensure that, in the event of default by the developer, funds will be used to install the required improvements at the expense of the developer.