Scottsdale, AZ Accessory Structures: ADU Impact Fees (2026)

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.