SB9 Lot Split & 3,000 SF New Home — Alamo
This project leverages California’s SB9 mandate to subdivide a large 0.5-acre property in Alamo into two separate legal parcels. The subdivision paved the way for a stunning new 3,000 square-foot custom home on the newly created lot, maximizing land value while preserving the character of the existing neighborhood.
Navigating complex subdivision requirements
Splitting a lot in Alamo requires careful planning to meet strict frontage, access, and setback regulations. The original 21,344 SF lot had to be divided to ensure both the existing house (on the retained 12,324 SF parcel) and the new lot (9,020 SF) met all zoning standards, including fire department access and utility separation.
Existing oversized lot with underutilized land.
Survey showing proposed division line.
Planning the shared driveway for fire access.
A new legacy estate on a dedicated parcel
We managed the entire Tentative Parcel Map and Final Map process to legally create the new 9,020 SF lot.
The new 3,000 SF home is designed as a modern farmhouse, featuring volume ceilings, a grand open-concept great room, and a seamless indoor-outdoor connection to its own private backyard.
Careful site planning ensured privacy between the original home and the new construction, using landscaping and orientation to create two distinct, high-value estates.
Final Map dividing the 21,344 SF lot into two.
Site plan showing new home placement and setbacks.
Front elevation of the 3,000 SF new residence.
Unlocking land value with a second luxury home
What was once a single large backyard is now a separate, buildable legal parcel with a high-end 4-bedroom, 3.5-bath residence. This transformation effectively doubled the property’s development potential without demolishing the original home.
Maximizing equity through SB9
By subdividing the land, the owner created a saleable asset worth significantly more than the vacant land alone. The new home provides a modern housing option in a desirable school district.
Single large parcel before subdivision.
New buildable legal parcel.
Estimated value of the new lot + home.
Beyond the Numbers
Two legal deeds
Owners can sell the new home separately.
Preserved existing home
Original residence remains intact on 12,324 SF.
Generational wealth
Creates significant equity through land development.
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