Is an Engineer Required for a Metal Building in South Carolina?

South Carolina jurisdictions — Columbia, Charleston, North Charleston, Mount Pleasant — require an engineer-sealed plan set for commercial and industrial metal buildings, and the PE seal is the standard requirement for the foundation and site-specific structural sheets. The seal must show the engineer's name, South Carolina PE number, and date, with the engineer in responsible charge. The manufacturer supplies PE-sealed drawings for the building itself — the rigid frames, purlins, and girts — but the foundations, site-specific load verification, and the permit set are designed and sealed by the South Carolina engineer of record. Owner-builders don't escape the requirement: the building department asks for the seal regardless of who drew the plans, and the engineer must verify the building for hurricane wind and Charleston's high seismic zone.

The engineer designs the foundations for foundations for hurricane uplift plus seismic reactions — Charleston sits in a high seismic zone, so the engineer details anchor bolts for overturning from both wind and earthquake, and verifies the rigid frames for rigid frames checked for hurricane wind and seismic drift — the engineer verifies bracing and base-plate anchorage for the Lowcountry's dual hazard. Purlins, girts, eave struts, and rod bracing go on the sealed plan set — member sizing for gravity and lateral loads, bracing layouts, and the anchor-bolt detailing that ties the building to foundations designed for hurricane wind and Charleston's high seismic zone. Bring the manufacturer's anchor-bolt plan and column reactions, a geotechnical report for the lot, and the building dimensions and eave height. Charleston sits in a high seismic zone — the engineer details anchor bolts for overturning from both wind and earthquake.

Use this checklist before engaging an engineer for your metal building: • Engineer of record holds an active South Carolina PE license, verifiable on the state roster • Foundations designed for the manufacturer's anchor-bolt reactions against hurricane wind and Charleston's high seismic zone • Rigid frames, purlins, and girts verified for hurricane wind and Charleston's high seismic zone per ASCE 7 • Rod bracing or portal-frame lateral system detailed on the sealed set • Anchor bolts, base plates, and hairpin ties detailed for uplift and overturning • Eave height, clear span, and bay spacing called out and checked • Geotechnical report reviewed before foundation design • Engineer confirms they'll respond to plan-check corrections on sealed sheets