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SB 9 Urban Lot Split
What is SB 9?
Senate Bill (SB) 9, signed into law on September 16, 2021, allows for “ministerial approval” of up to two primary dwelling units on a single-family lot. Alternatively, it also allows for splitting a parcel zoned for single-family development into two separate legal parcels, and the construction of up to two units on each resulting parcel. Ministerial approval is approval given at the staff level that only requires a project conform with a fixed standard or objective measurement and requires no discretionary oversight or judgment of the project.
The Town adopted Chapter 17.53 “Regulations and Objective Standards for Urban Lot Splits and Development Projects Sought Pursuant to Government Code Sections 65852.21 and 66411.7” as part of the Atherton Municipal Code (AMC).
What exactly does SB 9 allow me to do?
SB 9 allows property owners to add units to their property in two different ways:
- SB 9 allows up to two units on a parcel so property owners can add a single unit to an existing unit or construct two new units on a vacant parcel
- SB 9 allows parcels to be split into separate parcels, each of which may have up to two units (including existing and new units).
Documents
SB 9 Lot Split - Affidavit of Intent to Occupy - LLC Owner
SB 9 Lot Split - Affidavit of Intent to Occupy - Private Owner
SB 9 Final Map Recordation Instructions
SB9 Projects
| Project Type | Site Address | Status | |
| 1 | SB9 Lot Split | 2 Lowery Dr | RECORDED |
| 2 | SB9 Lot Split | 125 Glenwood Ave | RECORDED |
| 3 | SB9 Lot Split | 94 Palmer Ln | RECORDED |
| 4 | SB9 Lot Split | 78 Cebalo Ln | RECORDED |
| 5 | SB9 Lot Split | 1 Gresham Ln | RECORDED |
| 6 | SB9 Lot Split | 97 Santiago Ave | RECORDED |
| 7 | SB9 Lot Split | 61 Irving Ave | RECORDED |
| 8 | SB9 Lot Split | 197 Glenwood Ave | TPM APPROVED |
| 9 | SB9 Lot Split | 49 McCormick Ln | FM APPROVED |
| 10 | SB9 Lot Split | 190 Selby Ln | TPM APPROVED, FM UNDER REVIEW |
| 11 | SB9 Lot Split | 29 Lowery Dr | TPM APPROVED, FM UNDER REVIEW |
| 12 | SB9 Lot Split | 390 Greenoaks Dr | TPM UNDER REVIEW |
| 13 | SB9 Lot Split | 157 Glenwood | TPM APPROVED |
| 14 | SB9 Lot Split | 97 Placitas | TPM APPROVED, FM UNDER REVIEW |
| 15 | SB9 Lot Split | 3 Meadow Lane | TPM UNDER REVIEW |
| 16 | SB9 Lot Split | 110 Glenwood | TPM APPROVED |
| 17 | SB9 Lot Split | 95 Middlefield | TPM ON HOLD, AWAITING APPLICANT REPONSE |
| 18 | SB9 Lot Split | 30 Frederick | TPM UNDER REVIEW |
| 19 | SB9 Lot Split | 11 De Belle | TPM ON HOLD, AWAITING APPLICANT REPONSE |
TPM = Tentative Parcel Map. This is the first part of a two part application and approval process. The TPM may have conditions attached before the Town can approval the Final Map. An applicant must file the Final Map within two years of a TPM approval.
FM = Final Map. This is the second part of a two part application and approval process. The applicant must then record the approved map with the County Clerk-Recorder.
Recorded = Mapping is complete. The Final Map was accepted by the County Clerk-Recorder's office. Please review the County recorder's GIS Property Information Portal for information and details of the recorded maps. An property may not develop SB 9 lots using the SB 9 standards until this step is completed.
If you have any inquiries related to the project list above, please contact the Planning Department at planningdept@ci.atherton.ca.us or 650-752-0544