The SB 9 city guide
San Mateo
The SB 9 city guide
San Mateo
unincorporated
B
Grade
very friendly
very friendly
friendly
friendly
restrictive
very restrictive
We've given San Mateo a B for its standard approach to the implementation of SB 9, which includes some 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If you feel this grade was given incorrectly or it is outdated, please contact us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 
San Mateo
, 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
📐
San Mateo
 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
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
sb 9 standard
Vacant Lots*
Historical Zones
sb 9 standard
May require additional permits
Earthquake fault lines
sb 9 standard
Areas of high landslide and liquefaction risk
sb 9 standard
FEMA 1% annual chance flood (100-year flood) zones and floodways
sb 9 standard
Coastal areas
very restrictive
Buildings that can't be demolished
Officially recognized low-income housing
sb 9 standard
Rent-controlled housing
sb 9 standard
Housing that has been occupied by a tenant in the last 3 years
sb 9 standard
Renting & Selling
For all development options, resulting units must be residential use only
sb 9 standard
Renting
Requirements
Minimum rental period is 
30
 days
sb 9 standard
There is no income requirement for tenants
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
For Lot Splits, one unit must be owner occupied for three years
sb 9 standard
For Two-Unit Projects, 
all units can be rented
sb 9 standard
very friendly
friendly
restrictive
very restrictive
Selling Requirements
For Lot Splits, one lot must be owner occupied for three years
SB 9 Standard
For Two-Unit Projects,
units can not be sold separately
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Additional Requirements
Here are a few more restrictions and requirements that you should keep in mind when pursuing an SB 9 project in 
San Mateo
.
Parking req.
sb 9 standard
friendly
very friendly
restrictive
very restrictive
Objective Design Review Standards
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Landscaping
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Fire Safety
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Utility req.
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Easements req.
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Height limits
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Bureaucracy
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Fees
sb 9 standard
friendly
very friendly
restrictive
very Restrictive
Want to learn more about Homestead’s grading system? Read our methodology.
More about 
San Mateo
San Mateo is a popular San Francisco suburb with good public transit, highly rated public schools, an increasing number of tech jobs, and a diverse population. Everyone loves strolling through the beautiful Japanese Garden, hiking the Sawyer Camp Trail, and shopping and dining in historic Old Downtown. Like much of the Bay Area, housing is scarce, competitive, and expensive. We believe SB 9 can help fix these issues by adding more homes in a wide range of price points for people of all income levels. 
Check eligibility
Enter your address in California, and find out if your property is eligible for SB 9
You’re a step ahead of us!
We have not prepared a City Guide for
San Mateo
yet.
If you would like to request a City Guide for
San Mateo
or have information to share about their SB 9 implementation, please do so here.
All City Guides