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01

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Enter a property address in California, Florida, or Texas. We pull parcel data from county records in seconds.

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

03

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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.

ADU News

Accessory Dwelling Units become popular housing option

tricityvoice.com · Jan 28

ADU News

Have you built — or tried to build — an ADU in California? Tell us about it

sfchronicle.com · Jan 27

ADU News

Chicago’s hidden housing solution: How additional dwelling unit expansion can make city more affordable

illinoispolicy.org · Jan 23

ADU News

Much ADU about housing: Newton’s accessory unit zoning changes take shape - newtonbeacon.org

newtonbeacon.org · Jan 18

ADU News

Novato amends accessory dwelling unit regulations

marinij.com · Jan 16

ADU News

How-To ADU: The Handbook

cayimby.org · Jan 16

SB 9 & Lot Splits

Reinecke v. California Coastal Commission

pacificlegal.org · Jan 14

ADU News

Tiny homes, big improvements: 3 people share why they love living in ADUs

businessinsider.com · Jan 09

ADU News

How California’s new ADU law transforms multifamily real estate

fastcompany.com · Dec 06

Legislation

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

Cities