ADU Impact Fees: Peoria vs Phoenix
How do adu impact fees rules compare between Peoria, AZ and Phoenix, AZ?
Peoria and Phoenix have similar restriction levels.
Peoria, AZ
Maricopa County
Ariz. Rev. Stat. section 9-461.18 limits the fees Peoria may charge on accessory dwelling units and expressly prohibits requiring off-site street improvements. Standard building permit and plan review fees through Peoria Development and Engineering apply, calculated on construction valuation under the City's adopted fee schedule. Water and sewer development fees may apply if the ADU triggers a new utility connection.
View full Peoria rules →Phoenix, AZ
Maricopa County
Phoenix charges modest development impact fees on ADUs under Arizona Revised Statutes Section 9-463.05. HB 2928 caps ADU impact fees in cities over 75,000 at 50 percent of single-family rates. Phoenix water and wastewater capacity charges apply where new meters are installed.
View full Phoenix rules →Key Facts Comparison
| Fact | Peoria | Phoenix |
|---|---|---|
| Dedicated ADU Impact Fee | None in Peoria | - |
| State Cap | ARS 9-461.18 limits excessive ADU fees | - |
| Street Improvement | Cannot be required (state preempted) | - |
| Permit Fee Basis | Construction valuation | - |
| Utility Fees | Only if new connections required | - |
| Permit Authority | Peoria Development and Engineering | - |
| Fee Authority | - | ARS §9-463.05 |
| ADU Cap | - | 50% of single-family rate |
| Typical Total | - | $4,000-$8,000 |
| Permit Fee | - | $500-$1,500 typical |
Highlighted rows indicate differences between cities.
Peoria FAQ
Does Peoria charge an ADU impact fee?
Peoria does not impose a dedicated ADU impact fee. You pay standard building, plumbing, mechanical, electrical, and fuel-gas permit fees through Development and Engineering based on construction valuation. Water and sewer development fees apply only if a new meter or service connection is installed.
Can Peoria require street improvements for my ADU?
No. Arizona Revised Statutes section 9-461.18 expressly prohibits cities from requiring off-site street improvements as a condition of approving an accessory dwelling unit. Excessive fees that effectively prohibit ADU construction can be challenged under the state preemption framework.
Phoenix FAQ
How much are ADU impact fees in Phoenix?
Total impact fees typically run $4,000-$8,000 for a residential ADU. Under HB 2928, Phoenix must charge ADUs at no more than 50 percent of single-family rates in each category (water, wastewater, parks, fire, police, library, streets).
Are Phoenix ADUs under 750 sq ft exempt from impact fees?
No automatic exemption like California. Arizona HB 2928 caps ADU fees at 50 percent of single-family rates but does not provide a size-based exemption. Phoenix charges proportional fees regardless of ADU size.
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