Zoning and location
SB9 generally applies to single-family residential zones in eligible urbanized areas or urban clusters.
SB9 eligibility checklist
SB9 Eligibility in California: Property Checklist
SB9 eligibility has two layers: the legal screen and the practical engineering screen. A property may look promising under the statute and still fail if access, utilities, drainage, easements, building placement, or local standards do not work.
Short answer
What homeowners need to know first.
A property generally needs to be in a single-family residential zone, located in an eligible urbanized area, clear of key statutory exclusions, and capable of supporting practical access, utilities, drainage, and buildable parcels. Lot size matters, but it is only one checkpoint.
Decision points
Key factor Key factor Key factor Key factor Key factor Key factor
Use the page for the decision it actually owns.
Lot split math
An SB9 urban lot split generally must satisfy the 40 percent rule and minimum parcel-size rules unless a local exception applies.
Protected housing
Tenant protections, rent restrictions, Ellis Act history, and recent occupancy can block or complicate the path.
Historic and environmental limits
Historic resources, sensitive habitat, flood, fire, farmland, wetlands, and other constraints need review.
Access and utilities
The resulting parcels need a realistic way to function with access, utility service, drainage, and fire/life-safety review.
Local objective standards
Cities can apply objective standards, so the local implementation has to be checked alongside state law.
Property-specific review
Eligibility is more than asking whether the lot is big enough.
The legal screen starts with the statute. SB9 is aimed at qualifying single-family residential parcels in eligible urbanized areas. It does not apply to every parcel in California, and it includes exclusions for certain protected housing, historic properties, environmental areas, hazard areas, prior SB9 splits, and other conditions.
For an urban lot split, lot-size math is important. The proposed split generally cannot create one parcel smaller than 40 percent of the original lot area, and both resulting parcels generally need to be at least 1,200 square feet unless the local agency has adopted a smaller minimum.
The owner-occupancy affidavit also matters for urban lot splits. In many cases, the applicant must state an intent to occupy one of the housing units as a principal residence for at least three years after approval, unless a statutory exception applies.
The practical screen is where many properties succeed or fail. A qualifying lot still needs workable access, frontage or easement strategy, utilities, drainage, fire access, setbacks, and a parcel configuration that can support the owner’s goal.
A property may technically qualify but create a weak result if the new parcels are awkward, the existing home blocks the only good split line, utilities are expensive to extend, drainage is unresolved, or the lender/title path conflicts with the strategy.
Riechers reviews eligibility as a property-specific decision. The goal is to identify whether SB9 is worth pursuing before the homeowner spends heavily on plans, survey, mapping, or applications.
Related SB9 guides
Keep the full cluster connected.
Official sources
State rules and local review both matter.
Questions homeowners ask
SB9 Eligibility in California: Property Checklist FAQs
What makes a property eligible for an SB9 lot split?
A property generally needs to be in a single-family residential zone, located in an eligible urbanized area, and clear of statutory exclusions such as certain protected housing, historic, environmental, hazard, and prior-split conditions.
Is lot size enough to know if my property qualifies?
No. Lot size is only one screen. Access, utilities, drainage, easements, building placement, title, lender issues, and local objective standards can all affect feasibility.
Can SB9 create up to four residential units?
In some qualifying cases, SB9 can create a path toward two parcels and up to two units on each resulting lot, but the final answer depends on the property and local standards.
Can a city require parking for SB9?
A local agency may require up to one off-street parking space per unit, but parking cannot be required in certain transit or car-share situations described by the statute.
What should I do before spending money on design?
Start with a property-specific eligibility and feasibility review so the legal, physical, and local constraints are understood before heavier costs begin.
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