Accessory Structures in Tualatin, OR (2026)
4 verified accessory structures rules for Tualatin, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
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.
Tualatin ADU Rules and Permits
Some RestrictionsShed Rules
Per Tualatin's Planning FAQ, a non-habitable one-story detached accessory structure like a shed needs no building permit if its floor area does not exceed 200 square feet and it is no higher than 15 feet. Zone setbacks under TDC 40 and 41 still apply.
Tualatin Shed Rules and Permits
Few RestrictionsGarage Conversions
Converting a Tualatin garage into living space requires Building Division permits (building, plumbing, mechanical, electrical). If the conversion becomes a separate dwelling unit it must also meet ADU standards under TDC 34.600 and pass land use approval.
Tualatin Garage Conversion Rules
Some RestrictionsCarport Rules
Tualatin Development Code Chapter 40 (Low Density Residential RL Zone) governs carports and other accessory structures. Table 40-3 sets minimum setbacks of 15 feet front, 5 feet side, 15 feet rear, and 20 feet for a garage door, with a maximum structure height of 35 feet and a maximum lot coverage of 45 percent for single-family dwellings. A non-habitable detached accessory structure under 200 square feet and 15 feet tall does not require a building permit but must still meet TDC setbacks.
Carport Rules in Tualatin
Some RestrictionsLooking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Tualatin city rules.
Accessory Structures in Washington County →