S.C. Code § 42-1-660
No architect, engineer, land surveyor, landscape architect, or their employees or a corporation, partnership, or firm offering architectural services, engineering services, land surveyor services, or landscape architectural services who is retained to perform professional services on a construction project is liable in any action brought pursuant to Section 42-1-560 for any injury resulting from the employer's failure to comply with safety standards on a construction project for which compensation is recoverable under this title, unless responsibility for safety practices is specifically assumed by contract or by direct supervision or continual direction of the injured employee relative to the segment of the job which results in the injury.
The immunity provided by this section does not apply to the negligent preparation of design plans or specifications.
S.C. Code § 42-1-660