Can you build an ADU in Sylmar, Los Angeles?

Yes — about 89% of Sylmar's roughly 15,039 analyzed single-family lots can add an ADU by-right. Most are zoned R1, 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 Sylmar

Lots analyzed
15,039
Likely eligible
89%
Typical max size
1,200 sq ft
Median lot
7,560 sq ft

Typical zoning in Sylmar

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

ZoneLotsADU outlook
R15,658Allowed
RS4,013Allowed
RA1,432Allowed
RE11717Allowed
PF614Not allowed

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).

Sylmar ADU questions

In most of Sylmar, yes. About 89% of its analyzed single-family lots can add an accessory dwelling unit by-right, most commonly on R1-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

TarzanaToluca LakeTujungaUniversity ParkValley GlenValley VillageVan NuysVenice

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