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.
Arizona development impact fees are authorized under ARS 9-463.05 and must be proportional to actual demand. Phoenix charges impact fees for water, wastewater, parks, fire, police, library, and major streets. Under HB 2928 (2025), Phoenix must charge ADUs at no more than 50 percent of the single-family detached fee in each category. Typical Phoenix ADU impact fees total approximately $4,000-$8,000 depending on lot size and water meter requirements. Water Resource Acquisition Fee may apply. ADUs sharing utilities with the primary dwelling avoid separate capacity fees. Phoenix building permit fees scale with construction value, typically $500-$1,500. Plan review fees are separate.
Failure to pay impact fees before permit issuance prevents construction. Phoenix may file liens for unpaid fees. Bypassing impact fee assessment through unpermitted construction triggers double fees plus civil penalties under PZC enforcement.
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Phoenix, AZ
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Phoenix, AZ
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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.
See how Phoenix's adu impact fees rules stack up against other locations.
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