Eligibility review
Confirm zoning, urbanized-area status, tenant/historic/environmental exclusions, prior-split issues, lot size, and local objective standards.
California SB9 process guide
SB9 Lot Split Process in California: Step by Step
The SB9 process is not just filling out a form. A real urban lot split has to move through eligibility, parcel strategy, survey and engineering work, agency review, technical comments, final map approval, signatures, and recordation.
Short answer
What homeowners need to know first.
A practical SB9 lot split usually starts with property-specific eligibility and feasibility, then moves into parcel-map strategy, survey work, tentative map review, technical conditions, final map preparation, signatures, and recording. The fastest projects are usually the ones that check access, utilities, title, lender issues, and local objective standards before expensive work starts.
Decision points
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Use the page for the decision it actually owns.
Parcel strategy
Test whether the resulting lots can function with access, utilities, drainage, setbacks, fire access, and buildable area.
Tentative map
Prepare and submit the technical map package so the city or county can review the proposed split against SB9 and local standards.
Agency comments
Respond to completeness reviews, objective-standard comments, utility questions, and technical revisions.
Final map
Move from tentative approval into final survey, map, title, signatures, tax, utility, and recordation coordination.
Recorded parcels
The split becomes truly useful only when the map and required documents are recorded correctly.
Property-specific review
The right order protects the homeowner from expensive wrong turns.
The first mistake is treating SB9 like a simple permission slip. State law creates a ministerial path for qualifying projects, but the owner still needs a complete application, a practical parcel layout, and a property that can satisfy the applicable statutory and local objective standards.
That is why the process should start with feasibility. Before survey, architecture, or lender planning gets expensive, the property should be checked for single-family zoning, urbanized-area status, lot-size rules, tenant protections, historic-resource issues, environmental exclusions, prior SB9 use, access, utilities, slope, drainage, easements, and existing building placement.
Once the property appears worth pursuing, the next step is parcel strategy. The proposed line should create parcels that can actually function. A split that looks possible on paper can still be weak if one lot has poor access, awkward utility routing, no practical building envelope, lender complications, or a configuration future buyers will not understand.
The tentative parcel map phase turns that strategy into a submittal package. The city or county reviews the application against SB9, the Subdivision Map Act, and the local objective standards. Incompleteness letters, technical comments, and resubmittals are normal, so the owner needs a team that can respond quickly and keep the review moving.
After tentative approval, the work shifts to the final parcel map and recordation path. This may involve boundary and topographic survey work, title coordination, utility will-serve items, easements, drainage or improvement plans, tax collector requirements, owner signatures, notarization, agency signatures, mylar preparation, and recording fees.
The key point for homeowners is sequencing. A good process does not ask the owner to spend heavily before the lot has been screened. It also does not promise that SB9 approval alone solves financing, title, tax, construction, or sale strategy. Those questions should be surfaced early enough to shape the plan.
Related SB9 guides
Keep the full cluster connected.
Official sources
State rules and local review both matter.
Questions homeowners ask
SB9 Lot Split Process in California: Step by Step FAQs
What are the main phases of an SB9 lot split?
Most projects move through eligibility and feasibility review, parcel strategy, tentative parcel map preparation, agency review, comment response, final map preparation, signatures, and recordation.
Does SB9 approval happen automatically?
No. SB9 can require ministerial approval when a project qualifies, but the applicant still needs a complete package that satisfies the statute and applicable objective standards.
What slows down an SB9 lot split?
Common delays include unclear access, utility routing, drainage issues, easements, title or lender questions, incomplete submittals, and unresolved local objective-standard comments.
Should I start with design or feasibility?
Start with feasibility. Design work is more useful after the parcel strategy, constraints, local standards, and owner goals are understood.
When is the new lot actually created?
The new parcel structure becomes legally useful when the final map and required documents are recorded correctly. Tentative approval is an important milestone, but it is not the same thing as recorded parcels.
Next step
Find out what your lot can actually do.
Bring the property address and your goal. Riechers Engineering can help you understand whether SB9 is worth a closer look before you spend serious money.
Check SB9 Eligibility