Do I Need an Engineer to Build a Metal Building in Delaware?

Delaware jurisdictions — Wilmington, Dover, Newark, Middletown — 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, Delaware 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 Delaware 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 coastal wind and soft soils.

The engineer designs the foundations for deep foundations in soft coastal soils with uplift resistance — the engineer designs piers that carry the frame reactions through weak soils to bearing, and verifies the rigid frames for rigid frames engineered for coastal wind — the engineer verifies uplift anchors and rod bracing for full ASCE 7 wind loads on the Delmarva exposure. 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 coastal wind and soft soils. Bring the manufacturer's anchor-bolt plan and column reactions, a geotechnical report for the lot, and the building dimensions and eave height. The engineer verifies uplift anchors and rod bracing for full ASCE 7 wind loads on the Delmarva exposure.

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