California SB9 local guide
SB9 in Santa Monica: Lot Split Rules and Property Review
Review Santa Monica SB9 lot split rules, eligible zones, tentative and final parcel maps, local code, and property feasibility.
The free review starts with the property details. Riechers checks the local SB9 path and follows up if the parcel looks worth exploring.
Free eligibility review
Want to know if SB9 works for this Santa Monica property?
Send the property details through the eligibility checker and Riechers can review zoning, lot layout, access, utilities, and major feasibility constraints before you spend money on plans or applications.
Quick Answer
Santa Monica requires a tentative and final parcel-map process for an SB9 lot split. The City describes SB9 lot splits as available in R1 and OP1 districts, plus certain parcels in other residential districts that have only one single-unit dwelling, subject to the limits in Municipal Code Section 9.31.125.
The City handles an SB9 application ministerially when it meets the applicable objective standards, but that does not mean a site plan can be skipped. The split needs a buildable layout, survey-quality map work, utility and access planning, and a current code review.
What The City Looks For
Santa Monica says an SB9 lot split can create two parcels under the standards in Chapter 9.31.125 and Chapter 9.54. Its current checklist calls out the tentative parcel map, preparation by a licensed land surveyor or civil engineer, and specific site-development standards.
The City checklist includes an 800-square-foot unit protection, four-foot side and rear setbacks for most new construction, and local parking exceptions tied to transit or car-share conditions. The actual outcome still depends on the parcel, its zone, existing buildings, access, and current City review.
Why The Parcel Layout Matters
A property can appear promising by zoning and still have a weak subdivision plan. Before filing, evaluate:
- The likely 40/60 split and at least 1,200-square-foot resulting parcels.
- Where an interior lot line can sit without creating unsafe or unbuildable conditions.
- Building separation, fire access, existing structures, and setbacks.
- Driveway, frontage, easement, water, sewer, and power arrangements.
- Coastal and other local overlays that change the approval path.
Santa Monica processes map submissions electronically, but it eventually requires executed map documents and City signatures before recordation. A practical plan should account for both the entitlement and the final-map work from the start.
SB9 And SB1123 Are Different Paths
Santa Monica's subdivision page also explains SB684/SB1123, which is a separate small-lot subdivision path. It is not the same as SB9. The right strategy depends on the property, zoning, number of parcels and homes proposed, and the owner's actual objective.
Helpful next reads:
- Los Angeles County SB9 guide
- Manhattan Beach SB9 lot split guide
- Hermosa Beach SB9 lot split guide
- What is SB9?
- SB9 versus an ADU
- SB9 lot size requirements and the 40 percent rule
- The SB9 lot split process
Start With A Santa Monica Property Review
Use the SB9 eligibility checker to send the property address and a note about any planned ADU, remodel, or lot split. The early review should establish whether SB9, SB1123, an ADU path, or no subdivision is the better direction.
Frequently Asked Questions
Does Santa Monica require a parcel map for an SB9 lot split?
Yes. The City's public guidance describes both a tentative and final parcel-map process for an SB9 lot split.
Which Santa Monica zones may be eligible for an SB9 lot split?
The City identifies R1 and OP1, plus certain parcels in other residential districts limited to one single-unit dwelling. Section 9.31.125 and current City review control the final answer.
Are SB9 and SB1123 the same in Santa Monica?
No. Santa Monica identifies SB684/SB1123 as a separate small-lot subdivision path. The appropriate route depends on the project and property.
Official Sources
Statewide:
City of Santa Monica:
Next step
Get a free SB9 review before you commit to a lot split plan in Santa Monica.
The review starts with the actual parcel, then checks the local SB9 path, engineering constraints, and whether a real strategy is worth exploring.
