Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Peoria ADU cost →Building an ADU in Peoria 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 | Valuation-based (Fee Table 27-6, Ord. 2025-28, 11-4-25): $1,045.25 for the first $100,000 of construction value plus $5.60 per $1,000 above it, plus plan check at 65% of the permit fee — about $2,190 on a $150,000 casita, before impact fees |
| Impact Fees | Yes — development impact fees apply to any construction that creates a new dwelling unit and are paid at building-permit issuance (Peoria Impact Fee FAQ; City Code §20-32, §20-39). Seven categories (streets, parks, fire, police, water, sewer, water resources) vary by service area; the residential schedule took effect December 15, 2024, plus a 1% administrative charge (Fee Table 27-6). No ADU exemption exists — request a written estimate from Development & Engineering for your address |
| 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 Peoria, where we have them — free, no obligation.
Get Peoria builder quotes →Permit fees in Peoria are Valuation-based (Fee Table 27-6, Ord. 2025-28, 11-4-25): $1,045.25 for the first $100,000 of construction value plus $5.60 per $1,000 above it, plus plan check at 65% of the permit fee — about $2,190 on a $150,000 casita, before impact fees. The review timeline is Not published — no ADU review time frame could be verified from a city source (peoriaaz.gov sits behind a bot check). Fee Table 27-6 offers expedited plan check at 200% of the fee ($1,000 minimum); confirm current turnaround with Development & Engineering, with plan check: Full construction plan review under Peoria's building and fire codes and the Engineering Standards Manual (§21-316.A); plan check is billed at 65% of the building permit fee, and re-reviews after revisions at $220 for the first two hours (Fee Table 27-6). 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)). An ADU may not sit on a public utility easement without written consent from every easement holder and affected utility (§21-316.D.7). Impact fees are Yes — development impact fees apply to any construction that creates a new dwelling unit and are paid at building-permit issuance (Peoria Impact Fee FAQ; City Code §20-32, §20-39). Seven categories (streets, parks, fire, police, water, sewer, water resources) vary by service area; the residential schedule took effect December 15, 2024, plus a 1% administrative charge (Fee Table 27-6). No ADU exemption exists — request a written estimate from Development & Engineering for your address. Pre-approved plans: No city pre-approved ADU plan library could be verified as of September 2026 (Peoria's website was unreachable behind a bot check, and the code has no standard-plan section). A.R.S. §9-461.20 requires Peoria to make at least three pre-approved ADU plans available from July 1, 2026 — ask Development & Engineering whether the library is live.
| 1-Bedroom Rent | $1,400-$1,900/month |
| 2-Bedroom Rent | $1,650-$2,300/month |
| Annual Rental Income (est.) | $19,800/year |
| Payback Period (est.) | 10.9 years |
| Short-Term Rental | Yes, with a City vacation rental permit (Peoria City Code §§11-148 to 11-161, Ord. |
| Overall ROI Estimate | 6-11% gross rental yield |
A typical ADU in Peoria generates approximately $19,800 per year in rental income based on average 1-bedroom rents. At an average construction cost of $215,000, the estimated payback period is 10.9 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: $80,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $150,000-$300,000.
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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