Both are common in Acadiana for shops, barns and storage. They differ in how they're built, and that affects foundations, spans and what you ask contractors.
How they're built
- Steel-frame (pre-engineered) metal building: steel columns and rafters (rigid frames) with girts and purlins, usually anchored to a concrete slab or piers. Often chosen for wider clear spans and taller sidewalls.
- Pole barn (post-frame): posts set in the ground or on footings, with wood or metal framing and metal panels. Often chosen for ag and storage buildings, and some are built without a full slab.
Permits in Lafayette
LCG treats both alike in one key respect. A metal building or pole barn needs a permit, a floorplan, and an engineered stamped set of plans that includes wind load certification (see permits).
Questions to ask
- What wind design is on the stamped drawings, and how is the building anchored?
- What foundation does it need: a slab, piers or embedded posts? Who designs it?
- Is the site in a flood zone? (flood rules)
- What is included: doors, insulation, gutters, erection, concrete?
Humidity and condensation
In a humid climate, condensation under metal roofs is a common concern. Ask contractors what insulation or vapor control they recommend for your use.
General information only, not legal or engineering advice. Rules change, so confirm with the agency linked below or a licensed professional before you start work.
Sources
Last reviewed: October 2026.
Related: Barns & ag buildings · Metal shops · All guides