Exact-answer directory
ADUAllowed answers that go beyond a source link.
Every page below returns a defined record, boundary, or jurisdiction rule directly and states what still requires agency review.
10 exact-answer pages pass the record, boundary, or reviewed-rule gate.
10 admitted answers.
Search demand, distinct intent, exact answer, and index selection are all required. Source-route-only pages are not included.
New York, NY
New York City allows one ADU of up to 800 square feet on a qualifying one- or two-family property in eligible low-density areas, but the owner must occupy the property and obtain DOB approval.
Reviewed jurisdiction ruleLos Angeles, CA
Los Angeles allows ADUs under its city and state framework, but every new ADU, conversion, or standard-plan ADU still requires site-specific LADBS review and a building permit.
Reviewed jurisdiction ruleChicago, IL
Chicago now allows conversion units and coach-house ADUs more broadly across the city, but the project must receive ADU pre-certification and the required building permits before construction or occupancy.
Reviewed jurisdiction ruleHouston, TX
Houston does not use conventional zoning to prohibit an ADU citywide, but a new accessory dwelling or conversion still requires the applicable residential building permit and site review.
Reviewed jurisdiction rulePhoenix, AZ
Phoenix allows two ADUs on a single-family detached lot, with a possible third on a qualifying one-acre lot; a lot with a duplex or triplex may not add an ADU, and construction requires city permit approval.
Reviewed jurisdiction ruleSan Diego, CA
San Diego requires a building permit for every new ADU or JADU and for work that creates or converts space into one.
Reviewed jurisdiction rulePortland, OR
Portland requires building permits and any applicable trade permits to build or convert space into an accessory dwelling unit.
Reviewed jurisdiction ruleAustin, TX
Austin requires a building permit for a new accessory dwelling unit or an addition or conversion that creates one, after the unit receives its required address.
Reviewed jurisdiction ruleSeattle, WA
Seattle requires a construction permit to build an attached ADU, build a detached ADU, or legalize an existing unpermitted ADU.
Reviewed jurisdiction ruleSan Jose, CA
San Jose requires an ADU building permit before constructing a new unit or converting existing space into an ADU.