Garage conversion rules in Portland, OR — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space in Portland requires a building permit and typically trade permits. If the conversion creates an independent unit with kitchen and bathroom, it qualifies as an ADU under Chapter 33.205. Off-street parking considerations apply.
Portland Building Code requires a building permit when converting a garage to habitable (living) space. If the conversion results in an independent unit with both a kitchen and bathroom, it is classified as an ADU under PCC Chapter 33.205. Trade permits (electrical, plumbing, mechanical) are also required. Structural deficiencies must be corrected to bring the garage up to current building code. Unpermitted existing finished space must be legalized through a new permit. System Development Charges may apply to an ADU conversion; SDC waiver available with 10-year rental commitment and no STR use. Required off-street parking for the primary home must be maintained or relocated to a compliant area. Apply via Development Hub PDX portal.
Unpermitted conversion: building code enforcement. Must bring to code or restore. Safety violations: immediate correction.
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Side-by-side rule comparisons with other cities in Multnomah County.
See how other cities in Multnomah County handle garage conversions.
See how Portland's garage conversions rules stack up against other locations.
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