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

Colorado jurisdictions — Denver, Colorado Springs, Boulder, Fort Collins — 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, Colorado 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 Colorado 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 heavy snow loads, deep frost, and expansive Front Range clays.

The engineer designs the foundations for deep piers through expansive Front Range clays — the engineer designs for both frost heave and clay swell under the manufacturer's column reactions, and verifies the rigid frames for rigid frames with snow-rated purlins and drift checks — Colorado roof snow plus drift at parapets and steps drives purlin and frame sizing. 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 heavy snow loads, deep frost, and expansive Front Range clays. Bring the manufacturer's anchor-bolt plan and column reactions, a geotechnical report for the lot, and the building dimensions and eave height. Colorado roof snow plus drift at parapets and steps drives purlin and frame sizing — drift checks are engineered, not guessed.

Use this checklist before engaging an engineer for your metal building: • Engineer of record holds an active Colorado PE license, verifiable on the state roster • Foundations designed for the manufacturer's anchor-bolt reactions against heavy snow loads, deep frost, and expansive Front Range clays • Rigid frames, purlins, and girts verified for heavy snow loads, deep frost, and expansive Front Range clays 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