How to Plan an SB 9 Lot Split in California (2026)
SB 9 (2021) made urban lot splits ministerial statewide — no discretionary hearing — but 60% of owner applications still fail on eligibility or the 3-year owner-occupancy covenant. These eight steps check eligibility upfront and lock in the ministerial-approval path.
Step 1: Confirm eligibility: single-family zoning, not in historic district, not on a protected lot
SB 9 applies to parcels zoned single-family, outside coastal high-hazard zones, outside historic districts (HPOZ, National Register), outside very-high Fire Hazard Severity Zones, and outside farmland conservation easements. If any of those apply, SB 9 is not a pathway — you're back to standard subdivision or CUP.
Step 2: Verify the parcel is at least 2,400 sqft total (state minimum after split: 1,200 sqft each)
Both resulting parcels must be at least 1,200 sqft. The original parcel must therefore be at least 2,400 sqft. In LA, parcels under 2,400 sqft are disqualified. Parcels of exactly 2,400 sqft split into two 1,200-sqft lots with no margin for setback — usually unbuildable.
Step 3: Decide: Urban Lot Split, SB 9 Duplex, or both
SB 9 offers two distinct pathways. Urban Lot Split = create a second parcel. SB 9 Duplex = build up to two units on the existing parcel. You can stack both: split the lot, then build a duplex on each — up to 4 units total. Pick the pathway based on lot geometry and market goals BEFORE filing.
Step 4: Sign the 3-year owner-occupancy covenant
SB 9 requires the owner to occupy one of the resulting units as their primary residence for 3 years post-approval. The covenant is recorded against both parcels. Violation = project loses ministerial status and reverts to discretionary review (can be denied). Investors seeking to split-and-sell are explicitly blocked by this covenant.
Step 5: File Ministerial Approval application with LA City Planning
SB 9 approvals are ministerial — no Planning Commission hearing, no CEQA review, no neighbor-notification period. Application goes to LA City Planning SB 9 portal with: survey, proposed split geometry, owner-occupancy covenant, site plan showing setbacks comply. Typical approval: 60-90 days.
Step 6: Verify utility capacity and separate meters for each parcel
Each resulting parcel needs separate utility service. LADWP (water + power), SoCalGas, sewer lateral — all need separation or capacity verification. This is a $15-40K cost item that surprises owners who didn't plan for it. Request a utility-capacity letter from LADWP before finalizing the split.
Step 7: Survey and record the new parcel boundaries
A licensed California land surveyor stakes and records the new lot lines at the LA County Recorder's office. Recording fees $200-500. This formalizes the split and triggers re-assessment by the LA County Assessor (property tax basis). Expect property taxes to re-base on the new parcel values.
Step 8: Plan the build-out: each parcel can support 1 primary + 1 ADU + 1 JADU
Post-split, each new parcel is treated as a single-family lot that can hold 1 primary dwelling + 1 ADU (per AB 68) + 1 JADU (per AB 68). Combined with the SB 9 duplex path, a 5,000-sqft lot can ultimately hold 4-6 units. Confirm your city's interpretation — some LA neighborhoods apply local standards that reduce this density.
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