Is an Engineer Required for a Metal Building in California?

California jurisdictions — Los Angeles, San Francisco, San Diego, San Jose — 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, California 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 California 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 high seismic design categories and expansive soils.

The engineer designs the foundations for footings designed for Seismic Design Category D and E column reactions — the engineer details anchor bolts and base plates for overturning moments plus expansive-soil movement, and verifies the rigid frames for rigid frames engineered for drift limits and ductile detailing — California plan reviewers check frame bracing, diaphragm action, and P-delta effects under seismic loads. 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 high seismic design categories and expansive soils. Bring the manufacturer's anchor-bolt plan and column reactions, a geotechnical report for the lot, and the building dimensions and eave height. California plan reviewers check frame bracing, diaphragm action, and P-delta effects under seismic loads — drift limits drive rigid frame sizing.

Use this checklist before engaging an engineer for your metal building: • Engineer of record holds an active California PE license, verifiable on the state roster • Foundations designed for the manufacturer's anchor-bolt reactions against high seismic design categories and expansive soils • Rigid frames, purlins, and girts verified for high seismic design categories and expansive soils 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