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Zoning, setbacks, lot dimensions, assessed value — plus what state and local law allows you to build.

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ADU, duplex, lot split, multi-unit — see what's possible on your lot with development rules calculated.

Who This Is For

Homeowners

"Can I add a second unit to my backyard?"

Investors

"How many units can I build on this SB 9 lot split?"

Builders & Architects

"What's the max buildable envelope under current zoning?"

Housing News

ADU permits, zoning reform, building code updates — everything builders, architects, and developers need to know.

All ADU News SB 9 & Lot Splits Zoning Changes New Legislation Housing Market Affordability Development Permits & Approvals

ADU News

Tennis great Billie Jean King graduates from Cal State L.A. 65 years after enrolling

LA Times California · 1d ago

Tennis great Billie Jean King graduates from Cal State L.A. 65 years after enrolling
So you want to build an ADU in California? Here’s what you need to know

ADU News

So you want to build an ADU in California? Here’s what you need to know

latimes.com
LotCheck

ADU News

Daily Journal : California law gives people the right to build ADUs. Cities need to let them.

pacificlegal.org
ADU reform : what good is a law if it’s not enforced?

ADU News

ADU reform : what good is a law if it’s not enforced?

pacificlegal.org

ADU News

Still no place to live : The local barriers to the accessory dwelling unit revolution

pacificlegal.org · Jul 29
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Legislation

SB 9 Duplex + lot split
ADU Up to 1,200 sf
SB 1211 Multiple ADUs

Cities

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