ADU Impact Fees: Gilbert vs Glendale
How do adu impact fees rules compare between Gilbert, AZ and Glendale, AZ?
Gilbert has fewer restrictions than Glendale.
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 →Glendale, AZ
Maricopa County
Ariz. Rev. Stat. section 9-461.18 prohibits Glendale from imposing street impact fees on accessory dwelling units and limits other fees that could undermine the state by-right mandate. Standard building permit and plan review fees apply, scaled to construction valuation. Water and sewer development fees apply because Glendale requires a separate water meter and tap for every ADU, generating new connection charges that ordinary internal conversions in other cities avoid.
View full Glendale rules →Key Facts Comparison
| Fact | Gilbert | Glendale |
|---|---|---|
| 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 | - |
| Street Impact Fee | - | Not applied (state preempted) |
| State Cap | - | ARS 9-461.18 limits excessive ADU fees |
| Permit Fee Basis | - | Construction valuation |
| Water Meter Fee | - | Required (separate meter per ADU) |
| Water Tap | - | New tap to main required |
| Reference Document | - | Glendale ADU Update Mar 2025 |
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.
Glendale FAQ
Does Glendale charge an ADU impact fee?
Streets impact fees do not apply to ADUs because state law (Ariz. Rev. Stat. 9-461.18) prohibits requiring street improvements. Glendale does charge standard building permit fees scaled to construction valuation, and unlike many cities, requires a separate water meter and new tap for every ADU, which generates meter and connection fees.
Why is Glendale's ADU water fee higher than other Arizona cities?
Glendale uniquely requires every ADU to have its own city water meter with a new tap to the water main in the street or right-of-way. Most Arizona cities permit ADUs to share the primary dwelling's meter and service, avoiding new connection fees. Plan for separate water meter and tap charges in your Glendale ADU budget.
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