Senate Bill 9 | About

Senate Bill 9 (SB 9), the Housing Opportunity and More Efficiency (HOME) Act, is a 2021 California law that aims to increase housing supply across the State by requiring a streamlined ministerial approval process for urban lot splits and/or two-unit developments in single-family zones. The HOME Act was subsequently amended by SB 450 in 2024 and Assembly Bill 1061 in 2025. This webpage and all associated materials have been updated to reflect these changes.

For planning inquiries related to SB 9, email planning.SB9@lacity.org. For additional resources, please see the Resources & Contact tab.

Key Components

Two Unit Developments
Permits and streamlines the process for the development of two primary dwelling units on single-family zoned lots

Urban Lot Splits
Permits and streamlines the process for subdividing an existing single-family zoned lot into two individual parcels without having to meet the minimum lot size required by the underlying zone

Development Scenarios

These examples illustrate some of the most common development scenarios and do not represent every possible lot/unit configuration.

Urban Lot Splits

Lot Split with two new rectangular parcels and a Single Family Dwelling (SFD) on each lot

Lot split with flag lot configuration with SFD and Junior Accessory Dwelling Unit (JADU) on one lot and an SFD and a detached Accessory Dwelling Unit (ADU) on the other lot

 
 

Two Unit Developments

2 SFDs + 1 detached ADU

Duplex + 1 detached ADU

2 SFDs + 1 JADU

Duplex + 2 detached ADUs

Urban Lot Splits & Two Unit Developments

Duplex on each lot

Duplex on one lot and 2 SFDs on one lot

 
 
  • Front yard setbacks shall be the same as required by the underlying zone. Side and rear yard setbacks are required to be a minimum of 4 feet.
  • SB 9 projects shall be required to provide one covered parking space per existing and new unit, or no parking if a site meets the parking exemption criteria, which includes being within a half mile of a High Quality Transit Corridor or Major Transit Stop. See the SB 9 Implementation Memo for more information.

Urban Lot Split with SFDs and required parking on each lot

Urban Lot Split with SFDs and ADU/JADUs; Zero parking spaces required per unit if within 1/2 mile of a High Quality Transit Corridor or Major Transit Stop

Urban Lot Split with setbacks shown. Side and rear yard setbacks are required to be a minimum of 4 feet. Front yard setbacks shall be the same as required by the underlying zone. No setback is required for a legally existing structure.

 

For Urban Lot Splits Only

  • The maximum number of lots allowed for an Urban Lot Split is two lots.
  • No resulting parcels may be smaller than 40 percent of the lot area of the original parcel proposed for subdivision. Furthermore, both new lots must be at least 1,200 square feet.
  • A maximum of two dwelling units of any kind (including primary units and ADUs/JADUs) are permitted on a lot created through an Urban Lot Split.