We've given Unincorporated Sonoma County a B for its standard approach to the implementation of SB 9, which includes some regulations.
Last Updated:
May 30, 2023
If you feel this grade was given incorrectly, please contact us.
What's SB 9?
SB 9 is a state bill that was created to address California's housing crisis. It allows Californians more flexibility with their urban property than they've ever had before.
What can I build?
You have three options for an SB 9 project
Option 1: Lot Split
Divide your lot into two parcels; building on the new lot is allowed
Your lot must be at least 2,400 sqft and can be divided 50/50 or 60/40
sb 9 standard
Option 2: Two-Units
Keep your parcel as is, and add
very friendly
friendly
sb 9 standard
restrictive
very restrictive
Option 3: Lot Split & Two-Units
A mix of the above: divide your parcel, and add
very friendly
friendly
sb 9 standard
restrictive
very restrictive
Building max size
In
Unincorporated Sonoma County
, new units can be up to
sq ft. This is half the size of the median single family home in California.
very restrictive
California median home size
1,700 sq ft
Unincorporated Sonoma County
SB 9 Limit
sq ft
sq ft
Where can I build?
You can build in single-family residential zones
very friendly
friendly
sb 9 standard
restrictive
very restrictive
Places where you can't build
Prime farmland
sb 9 standard
Hazardous waste sites
sb 9 standard
High & very high fire severity zones
sb 9 standard
Lands identified for conservation of protected species' habitat
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