Can you build an ADU in Westlake, Los Angeles?

Yes — about 55% of Westlake's roughly 8,333 analyzed single-family lots can add an ADU by-right. Most are zoned R4, 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 Westlake

Lots analyzed
8,333
Likely eligible
55%
Typical max size
1,200 sq ft
Median lot
5,989 sq ft

Typical zoning in Westlake

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

ZoneLotsADU outlook
R41,934Allowed
C21,888Needs review
R31,355Allowed
CW1,243Needs review
RD1.5636Allowed

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).

Westlake ADU questions

In most of Westlake, yes. About 55% of its analyzed single-family lots can add an accessory dwelling unit by-right, most commonly on R4-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

WestwoodWilmingtonWindsor SquareWinnetkaWoodland HillsAdams-NormandieArletaArlington Heights

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