Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Goodyear ADU cost →Building an ADU in Goodyear 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 | 'Detached Casita or Guest House' (Fee Schedule p.11): permit per Valuation Table 1-A ($1,416 plus $8 per $1,000 over $100,000), plan review 65% of the permit, $86 planning and zoning, $102 application — about $3,184 on a $150,000 valuation, $3,844 on $200,000. Paid at issuance in Accela |
| Impact Fees | The Development Impact Fee schedule (effective April 1, 2024) has no ADU line: a single-family unit pays $4,205 north of the Gila River ($1,647 fire, $1,360 parks, $1,198 police) or $3,573 south of it. The fee schedule's casita line carries no impact-fee asterisk while custom homes do, yet the same schedule says all new construction is subject — ask Development Services (623-932-3004) for a Project Fee Estimate before budgeting. Water and wastewater development fees ($12,706 north / $15,257 south for a 3/4-inch meter) apply only if you add a meter |
| 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 Goodyear, where we have them — free, no obligation.
Get Goodyear builder quotes →Permit fees in Goodyear are 'Detached Casita or Guest House' (Fee Schedule p.11): permit per Valuation Table 1-A ($1,416 plus $8 per $1,000 over $100,000), plan review 65% of the permit, $86 planning and zoning, $102 application — about $3,184 on a $150,000 valuation, $3,844 on $200,000. Paid at issuance in Accela. The review timeline is Staff targets (Review Times page, updated February 12, 2026): 5 business days prescreen, 15 for the first review and 10 per resubmittal of a detached casita; an attached unit filed as an Addition/Alteration is 5/6/6. Targets, not the SB 1598 maximums in the city's Administrative Manual, with plan check: Full residential plan review by Building Safety under Goodyear's adopted building and fire codes; the unit must be self-contained with a bedroom and bathroom and may include a kitchen (§3.12.3.A.7). Third and later reviews cost $97 per hour; expedited review doubles the plan-review fee. State law bars a commercial building code or a fire-sprinkler requirement for an ADU (A.R.S. §9-461.18(D)), and the unit may not sit on a public utility easement without the utility's written consent (§9-461.18(E)). Impact fees are The Development Impact Fee schedule (effective April 1, 2024) has no ADU line: a single-family unit pays $4,205 north of the Gila River ($1,647 fire, $1,360 parks, $1,198 police) or $3,573 south of it. The fee schedule's casita line carries no impact-fee asterisk while custom homes do, yet the same schedule says all new construction is subject — ask Development Services (623-932-3004) for a Project Fee Estimate before budgeting. Water and wastewater development fees ($12,706 north / $15,257 south for a 3/4-inch meter) apply only if you add a meter. Pre-approved plans: None available yet. Goodyear's SMART library (Streamlined Municipal Approved Residential Types, under A.R.S. §9-461.20) reserves three ADU plan classes — SMART41 (200 sq ft), SMART42 (600 sq ft) and SMART43 (1,000 sq ft), each needing three elevation options — and all three were still 'Seeking Submittals' on September 20, 2026, past the statute's July 1, 2026 date. A posted plan is not a permit: you need the plan author's permission and a site-specific application with a site plan, grading, utility connections, energy compliance and a geotechnical report.
| 1-Bedroom Rent | $1,450-$1,800/month |
| 2-Bedroom Rent | $1,700-$2,100/month |
| Annual Rental Income (est.) | $19,500/year |
| Payback Period (est.) | 11.0 years |
| Short-Term Rental | Yes, with a Goodyear Short-Term Rental licence: renting any part of the property for under 30 days needs the $250 calendar-year licence (expires December 31, no proration), a state TPT licence, an emergency contact who c. |
| Overall ROI Estimate | 6-11% gross rental yield |
A typical ADU in Goodyear generates approximately $19,500 per year in rental income based on average 1-bedroom rents. At an average construction cost of $215,000, the estimated payback period is 11.0 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: $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 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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