SB 9 — Guía de división de lote en LA
Senate Bill 9 (efectivo enero 2022) permite a homeowners LA dividir un lot R1 en dos lots separados y construir hasta 4 units totales. Esta guía cubre qualifications, restrictions, timeline, costos, y cuándo SB 9 supera a un ADU regular.
SB 9 vs ADU — cuándo conviene cuál
ADU (Accessory Dwelling Unit). Una unit secundaria en el mismo lot. Main house + ADU sells together (salvo AB 1033). Simpler permit process, faster timeline (22–36 semanas), lower cost ($220K–$450K). Mejor si want a rental income stream or a guest house, and no quieres get into lot splits.
SB 9 urban lot split. Divide el lot en dos — each separately titled, each sellable independently. Max 4 units total (2 per lot). Más complex (14–24 meses), más expensive ($600K–$1.2M all-in), pero unlocks full land value split. Mejor si maxing out density y creating separate sellable assets es el goal.
El math matters. En Panorama City (lot value ~$280K), SB 9 split doesn't buy you much — each split lot is ~$140K, and the complexity + cost exceeds the upside. En Studio City (lot value ~$850K), SB 9 split creates two ~$425K lots — at that price tier, the investment economics work.
Los 8 pasos del SB 9 process
- Paso 1Feasibility check
Verify lot zoning (R1), size (≥1,200 sq ft y ≥40% del original for each split), no VHFHSZ, no hillside >15%, no Coastal, no historic designation. Baily lo revisa automáticamente.
- Paso 2Hire licensed surveyor
Surveyor produce tentative parcel map identificando el split line, setbacks, easements, y utility locations.
- Paso 3Submit SB 9 lot split application
LADBS Planning department — administrative review. 60-day statutory clock. Fee $3,500–$7,500 typical.
- Paso 4Owner-occupancy affidavit
State law requires 3-year owner-occupancy commitment on one of the units. Record en deed.
- Paso 5Design + permits para new construction
Architect diseña new unit(s) en lot B. LADBS plan-check 6–14 semanas después.
- Paso 6Construction
ADU/duplex build en lot B: 8–14 meses según size. Main house en lot A sigue as-is or gets addition.
- Paso 7Final map y separate title
Final parcel map recorded con LA County Recorder. Each lot gets separate APN y title insurance policy.
- Paso 8Sale or rental
Each separately-titled lot puede sellearse individualmente en fee simple. No HOA required.
Gotchas comunes que matan SB 9 deals
- ·Utility infrastructure. Existing water, sewer, gas, electric typically único a la property. SB 9 requires separate services para each lot — infrastructure splits cost $25K–$80K.
- ·Setback geometry. Después del split, existing house may violate new setback requirements. Solution: variance or physical modification.
- ·Mortgage consent. Lenders must approve the lot split. Refi or payoff usually needed.
- ·Tenant protection. No SB 9 split permitted si una unit tenant-occupied dentro de 3 years prior. Strict enforcement post-2023 amendments.
- ·Owner-occupancy. Must occupy one unit for 3 years. Breach triggers reversion to single-lot status + financial penalty.
- ·Property tax reassessment. Split typically triggers reassessment. Consult tax advisor for impact on future bills.
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Who is Baily?
Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.
He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.
That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.
Baily was a businessman before he was a scientist. That’s our vibe too.
Questions LA homeowners actually ask
Senate Bill 9 (Atkins, 2021), efectivo enero 2022. Obliga a todas las California cities a permitir urban lot splits en lots R1 (single-family zoning) y hasta two residential units per lot resultante. Net: un R1 lot puede transformarse en dos lots, cada uno con up to 2 units, para un máximo de 4 units totales donde antes solo 1 estaba permitido. Es el cambio zoning más significativo en California en 50 años.