Are ADU permits faster or slower in Oregon than California?

Most non-California states haven't enacted statewide preemption laws like California's AB 881. That means ADU permits generally take longer in non-CA jurisdictions — Seattle, Portland, and Boston typically run 14–18 weeks vs California's 7–14 weeks.

What's special about Oregon ADU rules?

Check the city-specific notes below — each jurisdiction within the state may have unique impact fees, parking requirements, or design review processes.

ADU permits · Oregon

Oregon ADU permits: city-by-city in 2026

Permit fees, approval timelines, and ADU-specific rules across Oregon. Each city below has its own page with sourced data, including the planning-department URL we re-validate against each quarter.

Cities

City	Permit fees (all-in)	Timeline	Notes
Portland	$7,000 – $14,000	~14 wks	Portland was an early adopter of ADU-friendly rules.

Oregon FAQ

Are ADU permits faster or slower in Oregon than California?: Most non-California states haven't enacted statewide preemption laws like California's AB 881. That means ADU permits generally take longer in non-CA jurisdictions — Seattle, Portland, and Boston typically run 14–18 weeks vs California's 7–14 weeks.
What's special about Oregon ADU rules?: Check the city-specific notes below — each jurisdiction within the state may have unique impact fees, parking requirements, or design review processes.

Get sourced ADU permit updates monthly