Can you build an ADU in Hansen Dam, Los Angeles?

Yes — about 11% of Hansen Dam's roughly 462 analyzed single-family lots can add an ADU by-right. Most are zoned OS, 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 Hansen Dam

Lots analyzed
462
Likely eligible
11%
Typical max size
1,200 sq ft
Median lot
26,155 sq ft

Typical zoning in Hansen Dam

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

ZoneLotsADU outlook
OS379Not allowed
PF26Not allowed
A123Allowed
RA12Allowed
RE1110Allowed

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).

Hansen Dam ADU questions

In most of Hansen Dam, yes. About 11% of its analyzed single-family lots can add an accessory dwelling unit by-right, most commonly on OS-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

Harbor CityHarbor GatewayHarvard HeightsHarvard ParkHighland ParkHistoric South-CentralHollywoodHollywood Hills

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