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The SB 9 city guide
Millbrae
The SB 9 city guide
Millbrae
unincorporated
C
Grade
very friendly
very friendly
friendly
friendly
restrictive
very restrictive
We've given Millbrae a C for its restrictive approach to the implementation of SB 9, which includes many regulations.
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.
Last updated:
5/5/2022
If you feel this grade was given incorrectly or it is outdated, please contact us
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. Read more about SB 9 here.
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
up to 2 units total
sb 9 standard
friendly
very friendly
restrictive
very restrictive


Option 3: Lot Split & Two-Units
A mix of the above: divide your parcel, and add
up to 4 units total
sb 9 standard
friendly
very friendly
restrictive
very restrictive


Building max. size
In
Millbrae
, 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
📐
Millbrae
SB 9 Limit
sq ft
Where can I build?
You can build in single-family residential zones
,
sb 9 standard
friendly
very friendly
restrictive
very restrictive
Places where you can’t build
May require additional permits
Buildings that can't be demolished
Renting & Selling
For all development options, resulting units must be residential use only
sb 9 standard
Renting
Requirements
Requirements
Selling Requirements
Additional Requirements
Here are a few more restrictions and requirements that you should keep in mind when pursuing an SB 9 project in
Millbrae
.
Want to learn more about Homestead’s grading system? Read our methodology.

Download Report
Here’s everything we did not cover
Want to learn more about Homestead’s grading system?
Read our guidelines
Read our guidelines
Other counties
San Mateo County
More about
Millbrae
Millbrae is a Bay Area suburb just close enough to San Francisco, with good public transit options, a friendly and diverse population, and great public schools. Anyone can enjoy strolling through Junipero Serra County Park, learning some local history at the Southern Pacific Train Depot, and attending the annual Art and Wine Festival. Like much of San Mateo County, homes are expensive and in low supply. We believe SB 9 can help by adding inventory and creating opportunities for renters and first-time home buyers to achieve their homeownership goals.
Check eligibility
Enter your address in California, and find out if your property is eligible for SB 9
