Before You Build an ADU, Read This: SB9 Lot Splits Might Unlock More Money

The say the proof is in the pudding so here you go.Sam Andreano is currently putting the finishing touches on his split-lot property in Whittier. He’s a guinea pig for state Senate Bill 9, a housing law that allows homeowners to divvy up their properties and build two or even four units on a once-single-family lot.

Andreano, 59, was one of SB 9’s earliest adopters. He bought a single-family home for $790,000 in 2021, split the property in half and sold the existing home on half of the original lot for $777,777 in 2023 — essentially coming out with an empty lot for a little over $12,000, around what it would have cost in the 1970s.

Then, Andreano spent around $400,000 building a home onto the back half of the original lot. He estimates it’ll be worth around $850,000 when it’s finished..

California's Senate Bill 9 (SB 9) is a game-changing law that allows

Homeowners to split their property into two separate lots—without

needing city approval or jumping through complicated bureaucratic hoops.

Here's the simple version:

You own one property. You split it into two. Each lot becomes its own

separate parcel with its own title. You can then sell one lot, build on

both, rent them out, or hold them as long-term investments.

The best part? When you split your property, it typically increases your

total property value by 25% or more. That's hundreds of thousands in

hidden equity that most homeowners don't even know they have.

In the Bay Area especially, where land is scarce and expensive, a single-

family lot could easily become two valuable properties.

But here's what stops most people: they don't know if their property

qualifies, how much it costs, or where to start.

That's exactly why we created California SB 9 Lot Split Solutions. We

help homeowners figure out if SB 9 makes sense for their situation—before

they waste time or money.

Ready to find out what your property could be worth?