California Sb9: What It Means And How To Make It Work To Your Advantage

Joe Polyak November 19, 2021

California Sb9: What It Means And How To Make It Work To Your Advantage
 
A new state law is poised to dramatically change single-family zoning restrictions in neighborhoods across California. It’s called SB9, and it’s already causing some confusion as homebuyers and homeowners try and figure out what it means for California neighborhoods.
 
Essentially, SB9 is a new state law that was signed into law on September 16, 2021. It takes aim at some of the long-standing zoning restrictions for single-family properties. When the law officially goes into effect on January 1, 2022, it’s going to make it much easier to build more than one housing unit on some single-family zoned properties.
 
It’s a new tool to tackle the state’s housing needs, but more importantly for the rest of us, SB9 gives average property owners a way to potentially create more cash-flow by building another housing unit, a duplex or even a four-plex. There are plenty of restrictions in play, however, to make sure big developers don’t simply wipe through neighborhoods and use the law to their own advantage.
 
To better understand SB9, it’s important to understand exactly what It does and what it does not do. Made up of two provisions, the first part of SB9 allows you to divide a single-family parcel into two parcels. The second part gives you the ability to construct a second home on the parcel. This means, you could start with one home on one parcel, but create two parcels with up to four total homes spread across the original property.
 
As stated, there are a lot of restrictions, starting with the location of the property. SB9 can essentially only be used for California cities and nearby suburbs. It cannot be used in historic districts or in fire hazard zones, which prevents SB9 from being used in certain locations across the State of California. If you’re interested in using it for a beach city property, it DOES apply to coastal zones.
 
There are also a number of restrictions when it comes to rent-controlled housing and low-income housing. In some cases, even if you recently had tenants but they moved out, it may not even work. There are also restrictions related to the size of the property. Under SB9, the parcel of land has to be at least 1,200 square feet.
 
Another unique restriction has to do with an existing single-family home on the property. If you’re redeveloping, you can only demolish one of that home’s walls. Also, local agencies could require you to put in one parking spot for each of the units on the property if it isn’t close enough to mass transit.
 
One of the biggest restrictions has to do with the property owner living in one of the units. To take advantage of SB9, you actually have to sign an affidavit saying you will occupy one of the housing units as your principal residence for at least three years. The penalty is perjury if you don’t abide by this.
 
Because you have to live in one of the units for an extended period of time, SB9 isn’t aimed at helping developers simply take over neighborhoods. Instead, it’s a tool that could help average single-family property owners build another home on the property, create a duplex or even a four-plex. That could end up being a major revenue builder for a savvy property owner.
 
The new law was designed to create more housing in California. With all of the restrictions in place, some estimates suggest SB9 could create upwards of 700,000 new housing units in the state. While that’s not a small amount, it is considerably less than the millions of new housing units the governor has said he wants to see built in the near future. There’s still some time left before SB9 officially becomes law across the State of California. In the meantime, it’s going to be interesting to see how cities and counties might respond with their own local ordinances.
 

Recent Blog Posts

Stay up to date on the latest real estate trends.

Inheriting a House in California? How Prop 19 Affects Property Taxes

October 19, 2026

What heirs, trustees, and families need to know about California’s Prop 19 rules before deciding whether to move into, rent, or sell an inherited home.

Is Fall a Good Time to Buy or Sell a Home in the Bay Area? | Rise Homes

October 13, 2026

A Bay Area guide to fall real estate, including September inventory, motivated buyers, seasonal competition, pricing strategy, and year-end opportunities.

Aerial view of a home with a curved swimming pool, patio, and raised wooden deck beside mature trees.
Multiple Offers: How Do You Choose the Best One? l RISE Homes

September 24, 2026

Why the strongest offer isn’t always the highest—and how price, financing, contingencies, and certainty can determine which buyer is truly in the best position to clos… Read more

Aerial view of a gray home with a red front door, green lawn, and wooded hills.
What Happens During Escrow in a Bay Area Real Estate Transaction? l Rise Homes

September 17, 2026

A practical look at what happens after an offer is accepted, from financing and title work to signatures, funding, and the final transfer of ownership.

Home patio with outdoor dining set and arched upper window at sunset.
What Is a Real Estate Disclosure Package? Bay Area Buyer & Seller Guide | Rise Homes

September 11, 2026

What is a disclosure package in Bay Area real estate? Learn what home inspections, seller disclosures, HOA documents, and property reports buyers typically review befo… Read more

Bright living room with a white armchair beside a large grid-pane window overlooking a tree-lined street.
Should You Sell Your Home As-Is or Fix It Up First?

September 3, 2026

How strategic preparation can increase buyer appeal, create stronger competition, and help you get the best possible result when selling your home.

Dining area with a round wooden table beside corner windows overlooking a leafy neighborhood, against a brick fireplace wall.
Pre-Listing Inspections: Are They Worth It for Bay Area Sellers? | Rise Homes

August 27, 2026

Learn why pre-listing inspections are worth it for Bay Area sellers. See how upfront inspections can build buyer confidence, reduce escrow surprises, and help create s… Read more

Backyard patio with a round table, chairs, raised flower beds, and mature trees.
What Buyers Notice in the First 30 Seconds of Seeing a Home | Rise Homes

August 20, 2026

A quick look at the curb appeal, smell, and brightness details that shape a buyer’s first impression before they ever study the rest of the home.

Wooden deck with potted plants, a covered grill, and wicker chair overlooking a flower-filled garden.
Why Overpricing Your Home Can Cost You Money | Bay Area Seller Strategy

August 14, 2026

How overpricing can reduce buyer demand, weaken competition, and lead to a lower final sale price.

Let’s Talk

You’ve got questions and we can’t wait to answer them.