Scottsdale, AZ Accessory Structures: Garage Conversions (2026)

Garage conversions are a cost-effective way to create ADUs in Scottsdale, typically ranging from $120,000-$160,000. The converted space must meet building code requirements for habitation including proper egress, ventilation, and utility connections. A standard building permit is required through the city's multi-step permitting process beginning with a Pre-Application request. ADUs require separately metered electrical and gas connections. The primary residence must be under construction or already existing before ADU/accessory building work can begin. Existing guest houses may be converted to ADUs if the owner demonstrates compliance with ADU regulations and receives approval. Guest houses constructed after January 1, 2025 must have a private deed restriction recorded against the property restricting them to guest house use only (not ADU use). State law under HB 2928 prohibits requiring commercial building codes or fire sprinklers for ADUs. Garage conversions that eliminate required parking spaces must comply with the parking provisions of the Zoning Ordinance, Article IX.