ADU rules in Maricopa, AZ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
The City of Maricopa does not permit standalone accessory dwelling units for separate housekeeping. A detached accessory structure may not have plumbing for a kitchen or laundry unless approved as 'guest quarters' under the city's zoning code. Guest quarters cannot be rented, leased, or sublet and are not treated as a second dwelling. Generally only one dwelling unit is allowed per lot outside the Heritage Mixed-Use Overlay District.
Maricopa regulates casitas as 'guest quarters' rather than rentable ADUs. Under the city's accessory structures rules, a detached accessory structure shall not have plumbing for separate housekeeping facilities such as a kitchen or laundry unless it is approved as a guest quarter meeting the standards in MCC 18.120.010. Guest quarters provide independent living facilities on a lot with another primary single-unit dwelling, but they shall not be leased, rented, or sublet, and the applicant must sign a statement at building-permit submittal prohibiting use as a second dwelling unit. Where guest quarters sit over a detached garage, the entire structure is treated as a main building subject to the zoning district's main-building standards, and guest quarters above garages may reach 25 feet with a pitched roof. Arizona's 2024 ADU law (HB 2720, A.R.S. 9-461.18) mandates by-right ADUs only for municipalities over 75,000 population; local reporting indicates Maricopa's population sits near that line but the threshold is not expected to apply until the 2030 Census, so verify current status with Development Services. Only one dwelling unit is allowed per lot except in the Heritage Mixed-Use Overlay District.
Building a casita with kitchen/laundry plumbing without guest-quarters approval, or renting out a guest quarter, violates the zoning code and can trigger code-enforcement action, permit denial, stop-work orders, and required removal of unpermitted plumbing or structures. Contact Development Services before construction.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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