Los Angeles
Los Angeles has a mature ADU rule path; verify parcel, zoning, setbacks, fire, and utility constraints before filing.
HighOfficial source path
ADU rule screen
Check backyard cottage rules by address.
Detached ADUs and backyard cottages can be constrained by lot coverage, setbacks, fire access, utilities, and local permit review.
Quick answer
Detached ADUs and backyard cottages can be constrained by lot coverage, setbacks, fire access, utilities, and local permit review.
What the card returns
Screen whether an ADU may be allowed at an address.
A useful ADU answer needs parcel facts: zoning, building type, unit count, lot constraints, utilities, and local ADU rules.
No fake build approvalUse the linked official source before acting on a high-stakes property or safety decision.
New York
New York ADU screening starts with NYC zoning/housing rules and the official City of Yes housing framework; property facts still control final eligibility.
HighOfficial source path
San Diego
San Diego ADU eligibility starts with companion/junior unit rules plus zoning and parcel constraints.
HighOfficial source path
San Jose
San Jose has official ADU rules and a local permit workflow; parcel facts still control final eligibility.
HighOfficial source path
Seattle
Seattle ADU/DADU rules are official and permit-driven; verify lot, floor area, trees, and utility constraints.
HighOfficial source path
Portland
Portland ADU rules use city permit guidance plus zoning and site constraints.
HighOfficial source path
Common questions
Can ADUAllowed give a final yes/no answer?
Only when the connected official source supports it. Otherwise ADUAllowed shows the official source route, confidence, and the facts still needing verification.
Why does the exact answer depend on local sources?
These records and rules are controlled by city, county, state, district, or agency systems. The same street address can cross a boundary that changes the final answer.