ADU Impact Fees: Chandler vs Phoenix
How do adu impact fees rules compare between Chandler, AZ and Phoenix, AZ?
Chandler and Phoenix have similar restriction levels.
Chandler, AZ
Maricopa County
Chandler does not impose dedicated ADU impact fees. Ariz. Rev. Stat. section 9-461.18 limits the fees cities may charge on accessory dwelling units to ensure compliance with the state by-right mandate. Standard building permit and plan review fees through Chandler Development Services apply, calculated on construction valuation. Water and sewer development fees may apply only when new utility connections are installed.
View full Chandler 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 | Chandler | Phoenix |
|---|---|---|
| Dedicated ADU Impact Fee | None in Chandler | - |
| State Cap | ARS 9-461.18 limits excessive ADU fees | - |
| Permit Fee Basis | Construction valuation | - |
| Utility Fees | Only if new connections required | - |
| Transportation Impact Fee | Not applied to ADUs | - |
| Park Impact Fee | Not applied to ADUs | - |
| 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.
Chandler FAQ
Does Chandler charge an ADU impact fee?
No. Chandler does not impose a dedicated ADU impact fee. You pay standard building, plumbing, mechanical, and electrical permit fees through Development Services based on construction valuation. Water and sewer development fees apply only if a new meter or service connection is installed.
Can Chandler impose excessive ADU fees?
No. Arizona Revised Statutes section 9-461.18 limits the fees Chandler may impose on accessory dwelling units to prevent the state by-right mandate from being undermined. Fees must reasonably reflect the actual cost of services provided and cannot effectively prohibit ADU construction.
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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