ADU rules in Tualatin, OR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Per TDC 40.220 (RL zone) and TDC 41.220 (RML zone), accessory dwelling units are a permitted housing type subject to TDC 34.600. The city's ADU page confirms three reviews — land use, engineering, and building — are required.
TDC 40.220 (Low Density Residential RL zone) lists Accessory Dwelling Unit as a Permitted housing type subject to TDC 34.600; TDC 41.220 does the same for the Medium Low Density Residential (RML) zone. The city's ADU page defines an ADU as a structure with its own kitchen, living space, and bathroom separate from the main house and identifies three permit tracks: Planning Division land use approval, Engineering permits for right-of-way work, and Building Division permits (building, plumbing, mechanical, electrical). RL zone setbacks (TDC Table 40-3) apply: front 15 ft, side 5 ft, rear 15 ft, garage door 20 ft, max 35 ft height, max lot coverage 45%. Oregon SB 1051 bars owner-occupancy requirements and limits ADU restrictions.
Building an ADU without TDC 34.600 land use approval or Building Division permits is a code violation. The Building Division can issue stop-work orders. Setback or coverage violations may require removal or modification.
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