You almost always need a permit. The type depends on how you set it up. Permanent foundation with utilities: full building permit with engineered plans, energy compliance, inspections. Hardest route but best resale value. On pier blocks no permanent foundation: many counties call this temporary. You might only need a zoning permit. Faster but limited stays. On wheels: classified as RV. No building permit in most places. Limited to RV parks or short stays on your land. The trick most people miss: call your county planning department before buying. Ask if they have approved a shipping container dwelling before. Some counties have a standard path. Others will look at you confused. Find out which yours is before spending money. We provide engineering reports and cert docs with every unit. Email info@atvworldwide.com if you want to check your county first.