What the county actually requires, who to call, and where people get caught out.
Standard rules with a genuinely easy small-structure path — detached accessory structures of 200 sq ft or less with no plumbing/electrical need no permit (and you can even add one light, one switch, and one outlet with a simple electrical permit) — but permits are required above $1,000 value per the county's ARS 11-321 adoption, there is no owner-builder opt-out, and enforcement is real near the Yuma/Foothills urban fringe.
Call the office above and describe your actual build. Two things catch dome builders out in every Arizona county, whatever the permit light says: septic is regulated by the state regardless of what the county does about buildings, and no permit means no certificate of occupancy — which usually means no conventional mortgage and no standard homeowner's insurance, and a cash-buyers-only sale later.
Snow load is the other one. At elevation in Arizona it is a real engineering number, not a formality — the calculator works it out for your site.
Work out your dome's struts, hubs and cost →
This is a plain-English summary of published county rules, gathered for Tom & Courtney's Desert Domes — it is not legal advice, and codes change. The county office above is the authority; confirm with them before you buy materials.