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Local guide

ADU rules in San Diego, California

San Diego has actively encouraged accessory dwelling units, and the city maintains its own ADU program materials. Coastal zones and steep lots are common enough here that feasibility work is worth doing carefully.

San Diego County

Regulation details are not published yet

ADUDesk publishes setbacks, size limits, parking rules, and fees for San Diego only once they have been checked against official sources. Until then, treat this page as orientation and confirm every requirement with the San Diego planning department, which is the authority for your parcel.

What to look into first

Questions that most often shape what is buildable on a lot in San Diego.

  • Check for coastal zone review

    Properties within the coastal zone can require an additional permit and a longer review. Confirm your parcel's status before assuming a schedule.

  • Understand slope and access

    Sloped lots change foundation design and equipment access, both of which affect cost. A site visit from a designer or contractor early is money well spent.

  • Ask about incentives and bonus programs

    Local programs periodically offer incentives for certain ADU projects. Terms change, so verify what is currently in effect directly with the city.

Cost context

What tends to move an ADU budget locally.

Construction pricing is regional, and two lots in the same city can produce very different budgets. Slope, distance to utility connections, whether an existing structure can be reused, and the fee schedule your jurisdiction applies all matter more than any statewide average.

Rather than anchoring on a headline number, get the published fee schedule from San Diego and at least two contractor bids on the same scope, then compare what each bid includes. Work through the cost factors to build a range you can defend.

Sources and review status

Last reviewed
Not yet reviewed against official sources.
Official sources
No verified sources have been added to this guide yet.

Checking ADU options in San Diego?

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