Garage conversion rules in Troutdale, OR — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
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.
Per the city's permit page, finishing a garage to create living space requires a building permit under TMC Title 15. If the converted garage becomes an independent dwelling with its own kitchen, bath, and sleeping area, it is an ADU under TDC 8.170 and uses a Type I procedure (TDC 6.900) for interior conversions. Single-family dwellings need at least one off-street space per dwelling unit (TDC 9.010); if the converted garage held the only required space, replacement parking must be added on a durable surface per TMC 10.12.040(B), meeting driveway standards in TDC 9.070.
Converting a garage without a permit, or creating a dwelling unit without ADU approval under TDC 8.170, violates code. The Building Division can issue stop-work orders. Loss of required parking without replacement violates TDC Chapter 9.
Troutdale, OR
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