All districts
An accessory dwelling unit (ADU) is permitted as an accessory use in every single-family residential district (AG, R1-43, R1-18, R1-10, R1-6, R1-3, R1-1) and in DR, per Table 3.1-1; it is not listed as allowed in MF-1, MF-2, MH, or the mixed-use and nonresidential districts other than DR. A lot may have one attached and one detached ADU, or one ADU on a duplex lot, plus an additional detached ADU on lots of one acre or more where at least one ADU is a deed-restricted affordable unit. Maximum ADU size is 75 percent of the gross floor area of the single-family dwelling on the same lot. The minimum rear and side setback for an ADU is 5 feet, and no separate utility meter, parking space, or density counting against Table 4.1-1 is required. Mobile homes, industrialized housing, RVs, and other wheeled or transportable structures cannot be used as ADUs. Arizona's statewide ADU law (HB2720, 2024, A.R.S. Section 9-461.18) requires ADU allowances in cities over 75,000 by January 1, 2025; Buckeye's 2025 Development Code rewrite folds ADUs into the base use table citywide in the districts listed above rather than adding a separate state-mandate section, so this pack cites the Development Code's own ADU standard directly.