ADU Laws & Permits

Washington State ADU law lets you build two ADUs on most urban lots. See size, parking, fee and owner-occupancy rules.

Oregon ADU rules under ORS 197A.425, plus Portland’s limits on size, height, placement and fees, including the SDC waiver. Sources linked.

Colorado ADU law (HB24-1152) requires metro-area cities to allow ADUs. See size, setbacks, parking, owner occupancy, fees and deadlines.

Sacramento ADU rules on size, setbacks, height and impact fees, with the city’s local limits next to the state minimums. Updated Oct 2026.

Build an ADU on your property? Check state law, zoning, lot rules, HOA limits and permits in five steps. Start with your state.

ADU laws by state: which states let you build by right? Compare California, Washington, Oregon, Colorado, Arizona and more, with sources.

Los Angeles ADU rules: allowed sizes, 4-foot setbacks, parking exemptions, fees and the 60-day permit clock, from city and state sources.

San Diego ADU rules: setbacks, parking and fees explained from the city’s Information Bulletin 400 (January 2026). Check what applies.

San Jose ADU requirements for size, height, setbacks, parking and permits, based on the 2021 ordinance. Confirm with the city first.

California ADU laws for 2026: sizes, setbacks, fees, parking, owner occupancy and permit deadlines, with sources from HCD and the statutes.