TradeCalcs · ADU

San Diego ADU Cost – Rough Ballpark

Free estimate tool — try it now, no signup required

Quick, all-in budget range for a new ADU in San Diego County. Not a quote – a smart starting point for feasibility.

Detached, attached and over-garage ADUs
Permits · Site · Utilities · Build
San Diego ADU rules in mind
Location and configuration
Single-story detached
Two-story / stacked
Over-garage ADU
Attached / JADU
Size and layout

This tool gives an educational rough budget range only, based on typical all-in ADU costs in San Diego County (design, permits, site work, utilities, construction). Actual pricing requires a full feasibility review.

Data-backed ranges based on real ADU projects.

Rough range and feasibility call

Free estimate tool — try it now, no signup required

We will show a planning range and log your ADU in FaresSystem so we can follow up with a more precise feasibility snapshot.

Your details
✓ Licensed & Insured – CSLB #1054602
✓ 100+ ADUs Built in San Diego County
✓ Permit Assistance Included
Questions? Call (858) 434-7166

By submitting, you consent to TradeCalcs reviewing this info to plan your ADU project and contact you. We do not sell your personal contact details. Anonymous project data may be used to improve internal pricing models and tools. This planning tool is not a contract.

Get a rough ballpark & talk to a pro

San Diego, CA homeowner?

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Cali Dream Construction (CSLB #1054602) builds ADUs and granny flats across San Diego County. Free in-home consultation.

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Disclosure: TradeCalcs and Cali Dream Construction are owned by the same operator (Azin LLC). Not affiliated with any other contractor.