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.
Arizona development impact fees are authorized under ARS 9-463.05 and must be proportional to actual demand. Gilbert charges impact fees for water, wastewater, parks, fire, police, library, and major streets. Under HB 2720 (codified at ARS 9-461.18), Gilbert may not charge ADU impact fees exceeding 50 percent of the single-family detached rate in each category. Typical Gilbert ADU impact fees run roughly $4,000-$9,000 depending on lot, water meter requirement, and whether utilities are shared with the primary dwelling. ADUs that connect to the primary dwelling's existing water and sewer service avoid most capacity fees. Gilbert building permit and plan review fees scale with construction valuation, typically adding $600-$1,800 to the project. Fees are paid at permit issuance.
Failure to pay impact fees before permit issuance prevents construction. Gilbert may file liens for unpaid fees. Building without paying impact fees through unpermitted construction triggers double fees plus civil penalties under the Land Development Code.
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Side-by-side rule comparisons with other cities in Maricopa County.
See how other cities in Maricopa County handle adu impact fees.
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