An ADU builder in Goodyear is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Goodyear's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Arizona.
What ADU Builders Cost in Goodyear [12][13][14]
Based on our Goodyear cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $150,000-$280,000 |
| Cost per Sq Ft | $175-$350 |
| Garage Conversion | $80,000-$150,000 |
| Prefab / Modular ADU (installed) | $150,000-$300,000 |
| City Permit & Plan Review | '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 |
For a full line-item breakdown, see our Goodyear ADU cost guide. To confirm what you're allowed to build before you hire, review the Goodyear ADU rules (max detached size: The lesser of 75% of the gross floor area of the principal single-family dwelling or 1,000 sq ft (§3.12.3.A.8). Article 8 measures gross floor area from the exterior walls, excluding only underground parking, uncovered steps, portals and exterior balconies; the state statute's own definition is interior habitable area (A.R.S. §9-461.18(I)(2)) — ask the planner which figure they apply to your house; owner-occupancy: Not required — §3.12.3 is silent on occupancy, and state law bars Goodyear from prohibiting separate long-term leasing of the house or the ADU or requiring any familial or other relationship between occupants (A.R.S. §9-461.18(B)(1)-(2)). The city's short-term rental licence page adds no owner-residency condition for ADUs either (the A.R.S. §9-500.39(B)(9) option that Scottsdale and Tempe use)).
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How to Vet an ADU Builder in Goodyear
- License: Confirm a current contractor's license in Arizona and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Goodyear and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits ('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), 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))), and 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) are included.
- Permit handling: Confirm they manage Goodyear's permit process ("A building permit through Accela Citizen Access — application type 'Building Applications', project type 'Residential Construction – Detached Guest House, Casita, or Accessory Building' (an attached unit files as 'Addition/Alteration'). Required uploads: a cover sheet listing the current codes, a site plan showing existing structures, setbacks, lot coverage and heights, foundation, floor, roof and framing plans, elevations of all sides with materials and colours, and an electrical plan (Residential Detached Accessory Building Submittal Guide, 01/2024). By right — no hearing, use permit or design review; applications filed on or after August 5, 2026 are reviewed under §3.12.3", typically 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) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Goodyear in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (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) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent Arizona ADU client references?
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