Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Goodyear ADU cost →Building an ADU in Goodyear 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 and plan review fees per the Development Services Fee Schedule (Development Center → Fees), paid through Accela (2.75% card fee) — confirm current amounts with Goodyear Development Services |
| Impact Fees | Yes — Goodyear's Development Impact Fees have been in effect since April 1, 2024 (schedule and 2024 fee report on the Development Center → Fees page); how they apply to an ADU is not stated there — confirm with Development Services 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 Goodyear — no obligation.
Get Goodyear builder quotes →Permit fees in Goodyear are Building permit and plan review fees per the Development Services Fee Schedule (Development Center → Fees), paid through Accela (2.75% card fee) — confirm current amounts with Goodyear Development Services. The review timeline is Confirm with Goodyear Development Services — the city publishes review times on its Development Resources page; minor 'EZ Permits' are approved within 5 business days, but a new ADU is a full residential permit, with plan check: Full residential plan review under Goodyear's adopted building and fire codes; the ADU must be self-contained with a bedroom and bathroom and may include a kitchen (§3.12.3.A.7). 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 — Goodyear's Development Impact Fees have been in effect since April 1, 2024 (schedule and 2024 fee report on the Development Center → Fees page); how they apply to an ADU is not stated there — confirm with Development Services before budgeting. Pre-approved plans: Coming: Goodyear's SMART program (Streamlined Municipal Approved Residential Types, under A.R.S. §9-461.20) reserves three pre-approved ADU plan classes at 200, 600 and 1,000 sq ft — all still 'Seeking Submittals' as of September 2026, so no plan is available yet. A pre-approved plan is not a permit; a site-specific application is still required.
| 1-Bedroom Rent | $1,250-$1,600/month |
| 2-Bedroom Rent | $1,500-$1,900/month |
| Annual Rental Income (est.) | $17,100/year |
| Payback Period (est.) | 10.7 years |
| Short-Term Rental | Confirm with the City of Goodyear — §3.12.3 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: Goodyear 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)). Note the older guest-house category may never be leased or rented (§3.12.4.A.4) — that is a reason to permit your unit as an ADU |
| Overall ROI Estimate | 6-9% annual return |
A typical ADU in Goodyear generates approximately $17,100 per year in rental income based on average 1-bedroom rents. At an average construction cost of $182,500, the estimated payback period is 10.7 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Goodyear 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 Goodyear: $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 Goodyear, 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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