Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Peoria ADU cost →Building an ADU in Peoria 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 apply — Confirm current amounts with Peoria Development Services |
| Impact Fees | Confirm with Peoria Development Services — the zoning ordinance does not address ADU impact fees, and no ADU fee waiver was found in a city source |
| 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 Peoria — no obligation.
Get Peoria builder quotes →Permit fees in Peoria are Building permit and plan review fees apply — Confirm current amounts with Peoria Development Services. The review timeline is Confirm with Peoria Planning & Community Development — no published ADU review timeline found in a city source, with plan check: Full construction plan review under Peoria's building and fire codes and the Peoria Engineering Standards Manual (§21-316.A). State law bars the city from applying a commercial building code to an ADU or requiring a fire sprinkler (A.R.S. §9-461.18(D)). Impact fees are Confirm with Peoria Development Services — the zoning ordinance does not address ADU impact fees, and no ADU fee waiver was found in a city source. Pre-approved plans: No city pre-approved ADU plan library found — Confirm with Peoria Development Services.
| 1-Bedroom Rent | $1,300-$1,600/month |
| 2-Bedroom Rent | $1,600-$2,000/month |
| Annual Rental Income (est.) | $17,400/year |
| Payback Period (est.) | 10.5 years |
| Short-Term Rental | Confirm with the City of Peoria — §21-316 does not address short-term rental of an ADU, and Arizona limits how far cities may restrict vacation rentals. What state law does guarantee is the long-term side: Peoria 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 Peoria generates approximately $17,400 per year in rental income based on average 1-bedroom rents. At an average construction cost of $182,500, the estimated payback period is 10.5 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Peoria 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 Peoria: $55,000-$135,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $85,000-$200,000.
3. Pre-approved plans — Peoria does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000). 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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