Can you build an ADU in Brentwood, Los Angeles?

Yes — about 95% of Brentwood's roughly 10,937 analyzed single-family lots can add an ADU by-right. Most are zoned RE15, which typically allows a detached ADU up to about 1,200 sq ft. These are zoning-only estimates; overlays like hillside, coastal, or historic can change the answer, so check your exact address for the rule that applies to your lot.

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ADU eligibility in Brentwood

Lots analyzed
10,937
Likely eligible
95%
Typical max size
1,200 sq ft
Median lot
9,000 sq ft

Typical zoning in Brentwood

The most common zones here, by number of analyzed lots. Your parcel’s zone sets which ADU rules apply.

ZoneLotsADU outlook
RE152,968Allowed
R11,826Allowed
RE201,401Allowed
RE401,069Allowed
RS978Allowed

Eligibility is zoning-only (zoning-only (overlays excluded; see checker for per-lot verdict)). Ruleset la-2026.06. Neighborhood boundaries: Los Angeles Times / Mapping L.A. (CC BY 4.0).

Brentwood ADU questions

In most of Brentwood, yes. About 95% of its analyzed single-family lots can add an accessory dwelling unit by-right, most commonly on RE15-zoned parcels. Your lot's exact answer depends on its zone, size, and any overlays — enter your address to see the rule that applies to you.

ADUs in other LA neighborhoods

Broadway-ManchesterCanoga ParkCarthayCentral-AlamedaCentury CityChatsworthChesterfield SquareCheviot Hills

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