Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Buckeye ADU cost →Building an ADU in Buckeye costs between $150,000-$280,000 for new construction, with per-square-foot costs averaging $175-$350. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $80,000-$150,000, while prefab/modular ADUs fall in between at $150,000-$300,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | $4,100-$5,600 in permit and plan-review fees for a 600-1,000 sq ft casita (Development User Fee Schedule, Res. 38-26, effective May 21, 2026: Table 1-A permit fee on the ICC valuation of $175.92/sq ft, plus 65% plan review and a $54 plot-plan review) |
| Impact Fees | Yes — Resolution 04-25 (adopted Feb 18, 2025, effective May 5, 2025) charges residential development fees per dwelling unit with no ADU category or exemption. For a low/medium-density unit in central Buckeye (Main fire area, Central water and wastewater): fire $1,762, library $605, parks $1,655 north or $3,119 south, police $1,657, streets $2,387, water $9,536, wastewater $7,524 — about $25,100-$26,600; the high-density row totals about $20,600. Fees are due before permit issuance (Ch. 18-10). Whether the city charges an ADU the full per-unit amount is not stated — get an estimate through the Impact Fee Request Form 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. We pass your request to up to 5 local builders serving Buckeye, where we have them — free, no obligation.
Get Buckeye builder quotes →Permit fees in Buckeye are $4,100-$5,600 in permit and plan-review fees for a 600-1,000 sq ft casita (Development User Fee Schedule, Res. 38-26, effective May 21, 2026: Table 1-A permit fee on the ICC valuation of $175.92/sq ft, plus 65% plan review and a $54 plot-plan review). The review timeline is about 10 business days for the first plan review of a residential accessory structure, then 5 business days for each later review (Plan Review Timeframes Guideline, effective Sept 28, 2023, average per review); total time depends on resubmittals, with plan check: Full plan review under Buckeye's building and fire codes (Chapter 15). No separate utility service unless the public utility determines a separate meter is required 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)). Third and later reviews cost $130 per hour, re-inspections $106, expedited review doubles the fee, and a permit expires after 180 days without an inspection (fee schedule §0 and §4). Impact fees are Yes — Resolution 04-25 (adopted Feb 18, 2025, effective May 5, 2025) charges residential development fees per dwelling unit with no ADU category or exemption. For a low/medium-density unit in central Buckeye (Main fire area, Central water and wastewater): fire $1,762, library $605, parks $1,655 north or $3,119 south, police $1,657, streets $2,387, water $9,536, wastewater $7,524 — about $25,100-$26,600; the high-density row totals about $20,600. Fees are due before permit issuance (Ch. 18-10). Whether the city charges an ADU the full per-unit amount is not stated — get an estimate through the Impact Fee Request Form before budgeting. Pre-approved plans: Yes — three pre-approved ADU plans, Buckeye Casita 200, Saguaro Casita 600 and Sonoran Casita 1000 (square feet — the three sizes A.R.S. §9-461.20(A)(4) requires from July 1, 2026), each with three elevations and a floor plan, under the Pre-Approved Housing and ADU Design Plan Program; three house plans at 1,200, 1,600 and 2,000 sq ft sit alongside them. Any deviation (wall changes, slab to wood floor, structural or truss changes) voids the pre-approval.
| 1-Bedroom Rent | $1,350-$1,750/month |
| 2-Bedroom Rent | $1,700-$2,150/month |
| Annual Rental Income (est.) | $18,600/year |
| Payback Period (est.) | 11.6 years |
| Short-Term Rental | No local short-term rental licence or ordinance was found in the Buckeye City Code (Chapters 7, 8 and 10, codified through May 5, 2026) or on the city website, so state law governs: Arizona bars cities from prohibiting v. |
| Overall ROI Estimate | 6-11% gross rental yield |
A typical ADU in Buckeye generates approximately $18,600 per year in rental income based on average 1-bedroom rents. At an average construction cost of $215,000, the estimated payback period is 11.6 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: $80,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $150,000-$300,000.
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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