Accessory Structures in Troutdale, OR (2026)
4 verified accessory structures rules for Troutdale, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
TDC 8.170 allows up to two accessory dwelling units per legal primary single-family dwelling — one must be an interior conversion or attached, and the other detached. Each ADU is capped at 800 square feet or 50% of the primary dwelling, whichever is smaller.
Troutdale ADU Rules and Permits
Some RestrictionsShed Rules
TDC 5.010 regulates residential accessory structures, including sheds. No shed may sit in the front yard, and side and rear setbacks are at least 3 feet. A single shed is capped at 1,000 sq ft and 20 feet tall; building permits apply over 200 sq ft or 10 feet.
Troutdale Shed Rules and Setbacks
Some RestrictionsGarage Conversions
Converting a garage into living space in Troutdale requires a building permit under TMC Title 15. If the conversion creates a separate dwelling unit, it also must meet ADU standards in TDC 8.170 and provide replacement off-street parking under TDC 9.010.
Troutdale Garage Conversion Rules
Some RestrictionsCarport Rules
Troutdale requires a building permit to construct, demolish, or move any carport over 200 square feet in floor area or over 10 feet in height (measured from finished floor to top plate). Smaller non-habitable accessory structures are permit-exempt but must still meet zoning setbacks. Carports also have to satisfy Troutdale Development Code parking dimensions and the underlying residential zone's setback and height standards. Confirm zone-specific setbacks with the Community Development Department at 503-665-5175.
Carport Rules
Some RestrictionsLooking for Multnomah County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Troutdale city rules.
Accessory Structures in Multnomah County →