Tempe does not impose a dedicated ADU impact fee. Standard building, plumbing, mechanical, and electrical permit fees through Tempe Community Development apply based on construction valuation. Water and sewer development fees apply only when a new utility connection is installed. Arizona HB 2720 (ARS 9-461.18) limits fees that would effectively prohibit ADU construction.
Tempe's development impact fees are authorized under ARS 9-463.05 and adopted by City Council. Standard impact fees for transportation, parks, and public safety apply to new principal residences but are not levied as a separate ADU impact fee. Tempe Water Utilities may assess water and sewer development (capacity) fees if the ADU triggers a new meter or service connection; sharing the primary dwelling's existing service typically avoids those charges. ARS 9-461.18 (HB 2720) prevents Tempe from imposing fees that would effectively prohibit ADU construction. Permit fees are calculated on construction valuation under Tempe's adopted fee schedule and typically range from several hundred to a few thousand dollars for a residential ADU, with plan review fees separate. Applicants should request a complete written fee estimate from Tempe Community Development before submittal so utility, plan check, and trade fees can be confirmed up front.
Failure to pay required permit and connection fees blocks issuance of the building permit and prevents lawful construction. Bypassing the fee process by building without a permit triggers double-fee assessment, civil penalties, and code enforcement action. Unauthorized utility tap-ins discovered later can result in disconnection, back-billing, and lien recording.
Tempe, AZ
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Tempe, AZ
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Tempe, AZ
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Tempe, AZ
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Tempe, AZ
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Tempe, 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 Tempe's adu impact fees rules stack up against other locations.
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