Do I need a permit for accessory dwelling unit (adu) in Douglas?
Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Arizona. Confirm the specifics with Douglas.
Arizona's 2024 ADU law (ARS 9-461.18) requires cities and towns over 75,000 people to allow at least one attached and one detached ADU as a permitted use on any lot where a single-family home is allowed. A 2025 law (ARS 11-810.01) sets a similar rule for counties. These ADU laws change zoning only. They do not override building codes, fire codes, or health and safety rules, although a city or county may not require an ADU to meet a commercial building code or have fire sprinklers. An ADU may not be built on a current or planned public utility easement without written consent from the utility, and a county may require a septic system to be sized for the new unit where there is no sewer or not enough sewer capacity. The owner-builder exemption in ARS 32-1121 covers structures intended solely for the owner's occupancy and not for rent, so an ADU built to rent generally needs licensed contractors. A new accessory dwelling unit, detached or added on, is new residential construction. It normally needs a building permit with full plans, plus separate electrical, plumbing and mechanical permits, and zoning approval for a second unit on the lot. Utility connections (water, sewer or septic, and electric service) are usually reviewed as part of the permit, so ask about capacity and connection fees early.
Documents you may need
- Site plan showing the unit, setbacks, easements, and utility routesRequired
- Floor plans and construction drawingsLikely required
- Septic sizing or sewer capacity information if not on a sewer with capacitySometimes required
- Written consent from the utility if any part of the unit sits on a public utility easementSometimes required
Possible inspections
- Foundation inspection before concrete is placed
- Framing and rough-in inspections (plumbing, mechanical, electrical)
- Insulation inspection where an energy code applies
- Final inspection
Frequently asked questions
- Do I need a permit for accessory dwelling unit (adu) in Douglas?
- Most likely yes. Accessory dwelling unit (adu) usually requires a permit in Arizona. Confirm the specifics with Douglas. The documents and inspections sections on this page list what the building department typically asks for.
- Who issues the permit in Douglas?
- The local building department for Douglas handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.