SB 9 – Lot Splits and Duplexes Now Allowed in Single-Family Zones
More flexibility, fewer restrictions—and more housing
SB 9 builds on California’s push to expand housing options by allowing homeowners to split their single-family lots and build up to four homes where just one was allowed before. Whether you’re looking to add a second home, subdivide your property, or both, SB 9 makes it possible—without drawn-out hearings or costly variances.
And it’s not just about the future—the change applies in nearly every urban single-family zone statewide, opening the door for homeowners and small-scale builders to unlock the full potential of their land. This is a major win for those who want to create housing without waiting on rezoning or special approvals.
What This Means for You
Before SB 9, single-family zoning made it nearly impossible to:
Build a second home (duplex) on your property,
Subdivide your lot into two parcels, or
Create more than one housing unit per lot.
Now, those barriers are gone. With SB 9, you can:
Build up to two primary homes on your lot (a duplex),
Split your lot into two parcels and build two homes on each, or
Combine both options for up to four homes total.
Key Benefits:
Build up to four homes on your single-family property
No discretionary hearings—ministerial approval makes the process faster and more predictable
Create more housing for family, rental income, or sale
Unlock the value of your property by increasing its density
Supports long-term investment and multigenerational living options.
How New Avenue Homes Can Help
At New Avenue, we’ve helped hundreds of clients build homes and ADUs that add long-term value to their properties—and we know how to navigate the new opportunities SB 9 provides.
With SB 9 in effect, the process is simpler than ever—and we’re here to help you make the most of it.
Here’s what we offer:
Expert guidance on zoning, lot splits, and permitting—with clear advice on SB 9 eligibility,
Design services tailored to duplexes, small-lot developments, and multigenerational living,
Full-service project delivery—we manage everything from idea to move-in,
Strategic planning for homeowners and small developers looking to maximize the potential of their land responsibly and efficiently.
Whether you’re looking to house family, generate rental income, or simply make the most of your property, SB 9 opens the door—and New Avenue can help you walk through it.
Ready to Build?
Schedule your free consultation today and learn how SB 9—and New Avenue’s proven process—can help you build smarter, rent flexibly, and unlock the full potential of your property.
