Public data transparency

Source-backed data notes for ADU plan records.

ADU Plan Finder organizes public city, county, and state ADU source material into searchable plan, provider, and jurisdiction pages. Each listing links back to official sources whenever available.

Last data refresh

Public dataset

Current public coverage metrics

15 city program pages

City program pages

Official city program pages in the current public dataset.

9 county context pages

County context pages

County-level pages for broader jurisdiction context.

232 canonical plan records

Canonical plan records

Original plan records from the source catalog where each plan comes from.

270 accepted-plan listings

Accepted-plan listings

Plan and location pairings shown across city and county pages.

86 providers

Providers

Architects, designers, prefab companies, and public programs in the directory.

287 source records

Source records

Official pages, PDFs, catalogs, and provider-linked records reviewed for the public directory.

How the data is organized

One source-backed model for plans, places, and evidence.

Plan pages distinguish the original source record from each place where that plan appears as accepted, so users can follow the public evidence without duplicate plan records.

Locations

Cities, counties, and state context pages used to organize ADU program coverage.

Canonical plans

The original plan records from the jurisdiction or provider catalog where the plan comes from.

Accepted listings

Where a plan is accepted for use. A plan can originate in one city or county and be accepted somewhere else.

Sources

Official city, county, state, PDF, and provider-linked source records used to support plan details.

Current coverage

City program pages

The public dataset is regenerated from committed data migrations so city program pages stay aligned with the reviewed source data.

  1. Berkeley, Alameda County, California
  2. Oakland, Alameda County, California
  3. Fresno, Fresno County, California
  4. Burbank, Los Angeles County, California
  5. Los Angeles, Los Angeles County, California
  6. Garden Grove, Orange County, California
  7. Santa Ana, Orange County, California
  8. Riverside, Riverside County, California
  9. Sacramento, Sacramento County, California
  10. Chula Vista, San Diego County, California
  11. Encinitas, San Diego County, California
  12. Escondido, San Diego County, California
  13. San Diego, San Diego County, California
  14. Santa Barbara, Santa Barbara County, California
  15. San Jose, Santa Clara County, California

Data quality principles

Trust rules shown in the public directory

Official sources first

We prioritize city, county, state, and official PDF sources.

Accepted vs. origin logic

Plans are not duplicated just because another city accepts them.

Missing data is shown honestly

If a field is not published by the official source, show "Not listed in source" instead of guessing.

Public corrections welcome

Users can submit corrections or missing official programs.

Known limitations

What the directory cannot guarantee

  • Official pages can change after the last data refresh.
  • Some official catalogs do not publish full details like bathrooms, stories, fees, or construction costs.
  • County-level context does not always mean a plan is accepted inside incorporated cities.
  • This directory is informational and not permit, legal, architectural, engineering, or construction advice.

Help improve the directory

Send source-backed updates for review.

Report outdated information or point us to an official program that is missing from the current public dataset.

Report a correction

Share a source-backed update for an existing plan, provider, location, or source page.

Report a correction