09/01/2026
Thinking about adding an ADU in Utah? Here's what surprises most homeowners: it needs a licensed structural engineer, nearly every time. 🏡
ADUs feel like a "small" project, but in Utah, nearly every one: detached, attached, or basement, needs PE-stamped structural drawings to get a permit. Between the building code, our seismic risk, and snow loads, plan checkers almost always ask for them.
Why? A plan checker won't approve it without a foundation plan, a framing plan, a lateral (wind + seismic) system, and the part people miss: snow loads matched to your city. The same ADU that flies in St. George won't pass in Park City, where snow loads are several times higher.
Skip the engineering and you're looking at a rejected permit, or worse, a unit that isn't built for where it actually sits.
The good news: it's one of the more straightforward things an engineer handles a site visit, the right foundation for your soil, and a stamped set your city will approve.
📌 Save this if an ADU's on your list and tag someone eyeing a backyard build.