Double your property's
development potential.
California SB9 allows you to split a single-family lot into two parcels and build up to two units on each — potentially creating four income-producing homes on a single residential lot. Arc handles design, permits, and construction for every unit.
Our process.
Everything you need
to know.
No. SB9 excludes lots in historic districts, earthquake fault zones, high fire hazard severity zones, designated flood zones, and certain coastal zones. Lots with existing rent-controlled tenants also have significant restrictions. We conduct a full eligibility check before any design work begins.
SB9 allows up to two primary dwelling units per parcel. Combined with ADU rights, each parcel can potentially have a primary unit plus an ADU — creating up to four units total on the original lot. The exact count depends on your lot size and city ordinances.
Yes. One of the primary purposes of SB9 is to allow homeowners to sell the split parcel separately. This creates significant liquidity — you can sell the vacant parcel, develop it and sell, or keep both and rent all units.
A full SB9 project — lot split, design, permits, and construction of new units — typically takes 18–24 months. The lot split application adds 2–4 months before construction permits are issued.
All cities in California must comply with SB9 as state law. However, cities can add reasonable objective standards. We're experienced with the specific requirements of Los Angeles, Sherman Oaks, Encino, Tarzana, Studio City, and surrounding Valley cities.
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on your sb9 project?
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