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.
Arizona's HB 2720 (Ariz. Rev. Stat. Sec. 9-461.18) restricts municipalities from imposing ADU fees that would effectively prohibit their construction or that exceed the actual cost of services. Scottsdale does not levy a separate ADU impact fee in its post-amendment fee schedule. Applicants pay standard building, plumbing, mechanical, and electrical permit fees through Planning & Development Services, scaled to construction valuation under the City's adopted fee schedule. Scottsdale Water assesses water and sewer development fees if the ADU triggers a new meter or service connection under Scottsdale Revised Code provisions; sharing the primary dwelling's existing service typically avoids those charges. The state preemption framework allows ADU applicants to challenge fees that appear excessive or punitive in administrative review or court. Scottsdale's adopted impact fees for transportation, parks, and public safety apply to new principal-unit construction but the City's amended ordinance applies them in a manner consistent with Sec. 9-461.18 to ADUs (typically not at all, or only at a substantially reduced level). Property taxes will adjust through the Maricopa County Assessor's reassessment after the certificate of occupancy.
Failure to pay required permit and connection fees blocks issuance of building permits and prevents lawful construction. Excessive fees that violate Ariz. Rev. Stat. Sec. 9-461.18 may be challenged through administrative appeal or court action. Unpermitted utility tap-ins discovered later can result in disconnection, back-billing, and code enforcement.
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