ADU Impact Fees: Gilbert vs Scottsdale
How do adu impact fees rules compare between Gilbert, AZ and Scottsdale, AZ?
Gilbert and Scottsdale 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 →Scottsdale, AZ
Maricopa County
Scottsdale does not impose a dedicated ADU impact fee. Ariz. Rev. Stat. Sec. 9-461.18 limits the fees Scottsdale may charge on accessory dwelling units, preventing fees that would effectively prohibit ADU construction. Standard building permit and plan-review fees through Planning & Development Services apply, calculated on construction valuation. Water and sewer development fees may apply only when new utility connections are installed.
View full Scottsdale rules →Key Facts Comparison
| Fact | Gilbert | Scottsdale |
|---|---|---|
| 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 Scottsdale |
| 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 or reduced for ADUs |
| Reassessment | - | Maricopa County Assessor |
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.
Scottsdale FAQ
Does Scottsdale charge an ADU impact fee?
No. Scottsdale does not impose a dedicated ADU impact fee. You pay standard building, plumbing, mechanical, and electrical permit fees through Planning & Development Services based on construction valuation. Water and sewer development fees apply only if a new meter or service connection is installed.
Can Scottsdale impose excessive ADU fees?
No. Arizona Revised Statutes Sec. 9-461.18 limits the fees Scottsdale 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.
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