Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Buckeye ADU cost →Building an ADU in Buckeye costs between $120,000-$245,000 for new construction, with per-square-foot costs averaging $145-$270. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $55,000-$135,000, while prefab/modular ADUs fall in between at $85,000-$200,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | 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 |
| Impact Fees | Yes — Buckeye's development impact fees were re-adopted by Resolution 04-25 on February 18, 2025 and took effect on May 5, 2025 (Finance → Impact Fees; amounts in the 2025 Development Fee Report). How they apply to an ADU is not stated on the page — ask the Permit Center for an estimate before budgeting |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 5 free quotes from ADU builders serving Buckeye — no obligation.
Get Buckeye builder quotes →Permit fees in Buckeye are 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. The review timeline is Confirm with Buckeye Development Services — no published ADU review timeline found in a city source; pre-approved plans are designed to shorten review, with 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)). Impact fees are Yes — Buckeye's development impact fees were re-adopted by Resolution 04-25 on February 18, 2025 and took effect on May 5, 2025 (Finance → Impact Fees; amounts in the 2025 Development Fee Report). How they apply to an ADU is not stated on the page — ask the Permit Center for an estimate before budgeting. Pre-approved plans: 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.
| 1-Bedroom Rent | $1,200-$1,550/month |
| 2-Bedroom Rent | $1,550-$1,950/month |
| Annual Rental Income (est.) | $16,500/year |
| Payback Period (est.) | 11.1 years |
| Short-Term Rental | 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)) |
| Overall ROI Estimate | 6-9% annual return |
A typical ADU in Buckeye generates approximately $16,500 per year in rental income based on average 1-bedroom rents. At an average construction cost of $182,500, the estimated payback period is 11.1 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Buckeye and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Buckeye: $55,000-$135,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$200,000.
3. Pre-approved plans — available in Buckeye, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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