Floor Plans & Design
Architectural Plans vs. Structural Engineering: What You Actually Need
Barndominium Design Pros · April 15, 2026 · 5 min read
One of the most common and most expensive misunderstandings in this industry is assuming a purchased plan set is everything a jurisdiction will require. Usually it is not. These are distinct documents produced by distinct professionals.
The document types
A typical residential project involves several separate deliverables:
- Architectural plans: layout, elevations, sections, schedules — the design of the building
- Structural engineering: framing, connections and load paths, stamped by an engineer
- Site-specific engineering: wind, seismic and snow loads for your actual location
- Foundation engineering: slab or footing design based on your soils report
- Permitting documents: whatever else your jurisdiction requires, such as energy compliance or site plans
Why stock plans cannot include all of it
Site-specific engineering depends on your location, your soils and your local code adoption. A plan sold nationally cannot know any of those things in advance, which is why that work is priced separately and completed once your site is known.
That is not a gap in the product. It is the correct sequence — but only if you budget for it from the start.
Ask your jurisdiction first
Before buying any plan set, call your building department and ask what a residential submittal requires, whether stamped drawings are required, and whether metal or post-frame residential structures carry additional review. A ten-minute call frequently changes the plan-buying decision.