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Free preliminary planning tool

Preliminary ADU Cost Calculator

Carry your model forward and build a transparent preliminary cost and financing scenario in 9 simple steps.

Preliminary estimate

Project setup

Your selections are saved automatically.

Step 1 of 9 · Property

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Step 1 of 9

Property

Confirm the project location and optional property dimensions.

Select a suggestion to auto-fill the city and ZIP code.

Parcel and existing home size auto-fill when you start from a property check. Both are optional and only refine your estimate.

Ready for a useful first answer?

Start with your property, then talk through the details.

Review a preliminary site fit or request a property-specific conversation with the ADU California team.

AADU.zoneSteel-framed backyard homes

Property review, design, engineering coordination, permitting, steel framing, and construction support for California homeowners.

Preliminary online results are planning guidance, not a permit decision or site survey.

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Call our team(650) 400-7606EmailADUcaliforniainc@gmail.comADU California Inc. / ADU.zone1724 Junction Ave, Unit D, San Jose, CA 95112
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