ADU Impact Fees: Gilbert vs Peoria
How do adu impact fees rules compare between Gilbert, AZ and Peoria, AZ?
Gilbert and Peoria have similar restriction levels.
Gilbert, AZ
Maricopa County
Gilbert charges development impact fees on new ADUs under ARS 9-463.05, but HB 2720 caps ADU impact fees in cities over 75,000 at no more than 50 percent of single-family detached rates in each category. Water and sewer capacity fees apply where a new meter is installed; shared utilities avoid those charges.
View full Gilbert rules →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 →Key Facts Comparison
| Fact | Gilbert | Peoria |
|---|---|---|
| Fee Authority | ARS §9-463.05 | - |
| ADU Cap | 50% of single-family rate | - |
| Typical Total | $4,000-$9,000 | - |
| Permit Fee | $600-$1,800 typical | - |
| 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 |
Highlighted rows indicate differences between cities.
Gilbert FAQ
How much are ADU impact fees in Gilbert?
Total impact fees typically run $4,000-$9,000 for a residential ADU depending on lot size and whether a separate water meter is required. ARS 9-461.18 caps ADU charges at 50 percent of single-family rates in each category.
Can I avoid water and sewer capacity fees by sharing utilities?
Yes in most cases. ADUs that connect to the primary dwelling's existing water and sewer service typically avoid separate capacity fees. Confirm with Gilbert Development Services and Water Resources during plan review.
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.
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