Everything homeowners ask about building an ADU in Buckeye — answered with 2026 data.
Yes, ADUs are allowed in An accessory use to a principal residential use in every zoning district listed in Table 3.1-1, Table of Allowed Uses (Buckeye Development Code §3.3.4.A.1) — the table marks 'Accessory Dwelling Unit' as permitted (P) across the residential districts from AG and R1-43 through R1-6, R1-3, R1-1, MF-1, MF-2 and MH and in the mixed-use districts, keyed to §3.3.4.A; ADUs are also allowed in the obsolete districts that allow single-family dwellings in Buckeye, AZ. The maximum size for a detached ADU is 75% of the gross floor area of the single-family dwelling on the same lot (Development Code §3.3.4.A.4). The code sets no separate 1,000 sq ft ceiling, so a 2,000 sq ft house allows a 1,500 sq ft ADU — and the three city pre-approved casita plans run 200, 600 and 1,000 sq ft. Attached ADUs can be up to Same rule — 75% of the house's gross floor area. Buckeye has an ADU-friendliness score of 7/10. Check our full Buckeye ADU rules page for complete zoning details.
ADU construction in Buckeye typically costs $120,000-$245,000. The cost per square foot averages $145-$270. Garage conversions are more affordable at $55,000-$135,000, while prefab ADUs cost $85,000-$200,000. Permit fees add Building permit fees apply (Building Permit Application, revised July 22, 2026; a Permit and Impact Fee Request Form is available) — confirm current amounts with the Buckeye Permit Center to your budget. See our detailed Buckeye ADU cost guide.
Detached ADUs in Buckeye can be up to 75% of the gross floor area of the single-family dwelling on the same lot. Attached ADUs are limited to Same rule — 75% of the house's gross floor area. Junior ADUs (JADUs) have a cap of Not a category in Arizona — Buckeye's Development Code has no junior ADU designation. Maximum height is The building height of the zoning district, since an ADU follows the site and building standards for principal dwellings in its district (§3.3.4.A.2): 35 feet in AG, R1-43, R1-18, R1-10 and R1-6; 45 feet in R1-3 and R1-1; 40 feet in MF-1; 30 feet in MH (Table 4.1-1, Dimensional Standards — Rural and Residential Districts). You are allowed up to 2 per single-family lot — one attached plus one detached ADU on a qualifying lot.
Rear setback: 5 feet from the property line — the ADU exception to the district's principal-dwelling setback (§3.3.4.A.2), which otherwise runs 20 to 40 feet in the R1 districts (Table 4.1-1); state law caps what the city may require at 5 feet (A.R.S. §9-461.18(B)(6)). Side setback: 5 feet from the property line (§3.3.4.A.2) — the state-law ceiling. Front setback: The district's front setback for a principal dwelling (§3.3.4.A.2; Table 4.1-1): 40 feet in AG and R1-43, 25 feet in R1-18, 20 feet in R1-10, 12 feet in R1-6 and R1-3, 0 in R1-1, and 40 feet everywhere for a front-loaded garage in the larger districts. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
None — 'Parking for vehicles is not required for an ADU' (§3.3.4.A.7; A.R.S. §9-461.18(B)(3)). Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Not required — §3.3.4.A is silent on occupancy and rental terms, and under state law Buckeye may not prohibit leasing or advertising either the house or the ADU as separate long-term rental housing, nor require any familial or other relationship between occupants (A.R.S. §9-461.18(B)(1)-(2)). Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Buckeye is typically Confirm with Buckeye Development Services — no published ADU review timeline found in a city source; pre-approved plans are designed to shorten review. Plan check: Full plan review under Buckeye's building and fire codes. The ADU is not required to have separate utility services unless the public utility determines a separate meter is needed for safety (§3.3.4.A.5). State law bars a commercial building code or a fire-sprinkler requirement for an ADU (A.R.S. §9-461.18(D)). Pre-approved plans availability: Yes — three pre-approved ADU plans: Buckeye Casita 200, Saguaro Casita 600 and Sonoran Casita 1000 (square feet), each with three elevations and a floor plan, under the city's Pre-Approved Housing and ADU Design Plan Program (Building Safety); three house plans at 1,200, 1,600 and 2,000 sq ft sit alongside them.
Average ADU rental income in Buckeye: 1-bedroom units rent for $1,200-$1,550/month, 2-bedroom units for $1,550-$1,950/month. Short-term rentals: Confirm with the City of Buckeye — §3.3.4.A does not address short-term rental of an ADU, and Arizona limits how far cities may restrict vacation rentals (A.R.S. §9-500.39). What state law does guarantee is the long-term side: Buckeye cannot prohibit leasing the house or the ADU separately on a 90-day-or-longer or month-to-month basis (A.R.S. §9-461.18(B)(1), (I)(3)). Expected ROI: 6-9% annual return.
The minimum lot size for an ADU in Buckeye is No ADU-specific minimum lot size — the district's lot coverage limit is the practical constraint, and ADUs are exempt from the district's maximum residential density (§3.3.4.A.6). A lot of 1 acre or more unlocks a third unit. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Buckeye, a garage conversion typically costs $55,000-$135,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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