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Planning and development applications in California

Planning and development applications.

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In California, 58 county departments and 1 city government publish 61 official links for this service. Reviewed requirements cover availability notices (28), documents (17), processing time (4) and appointments (1). 42 counties have a page for it below.

Before you start · 2 things to check
  • Start with the jurisdiction of the property. County permit offices may serve only unincorporated areas.
  • Use the official map and confirm project requirements with the planning or building office.

1 guide with reviewed service links · Trinity

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Highlighted counties have a reviewed service guide matching this selection. An agency may serve only a city or part of a county.

California58 counties
California county mapChoose a county to open its directory. Use the county search and list for smaller counties.Alameda County: open directoryAlpine County: open directoryAmador County: open directoryButte County: open directoryCalaveras County: open directoryColusa County: open directoryContra Costa County: open directoryDel Norte County: open directoryEl Dorado County: open directoryFresno County: open directoryGlenn County: open directoryHumboldt County: open directoryImperial County: open directoryInyo County: open directoryKern County: open directoryKings County: open directoryLake County: open directoryLassen County: open directoryLos Angeles County: open directoryMadera County: open directoryMarin County: open directoryMariposa County: open directoryMendocino County: open directoryMerced County: open directoryModoc County: open directoryMono County: open directoryMonterey County: open directoryNapa County: open directoryNevada County: open directoryOrange County: open directoryPlacer County: open directoryPlumas County: open directoryRiverside County: open directorySacramento County: open directorySan Benito County: open directorySan Bernardino County: open directorySan Diego County: open directorySan Francisco County: open directorySan Joaquin County: open directorySan Luis Obispo County: open directorySan Mateo County: open directorySanta Barbara County: open directorySanta Clara County: open directorySanta Cruz County: open directoryShasta County: open directorySierra County: open directorySiskiyou County: open directorySolano County: open directorySonoma County: open directoryStanislaus County: open directorySutter County: open directoryTehama County: open directoryTrinity County: open directoryTulare County: open directoryTuolumne County: open directoryVentura County: open directoryYolo County: open directoryYuba County: open directory
County directory Reviewed service guides available
Map for browsing; agency service areas may differ.
Map source

U.S. Census boundaries via U.S. Atlas · 2017 edition, simplified for display.

County government · Trinity

Trinity County Community Development — Planning Division

County GIS/planning resource. The map is informational; confirm property jurisdiction, layer accuracy and project requirements with the responsible office.

Trinity Planning Division application/document directory (opens in a new tab)Official instructions

The actual Planning Division page links its application/document/form directory. This does not establish all current requirements, fees or processing times.

Source checked October 26, 2026

County of Trinity · Trinity County Planning Division (opens in a new tab)

Trinity Planning Division application/document directory

Applications, Documents, and Forms

Saved evidence: 66a09f35e33fdb23 · Agent source review

Full guide, contact details & sources →

Planning and development applications by county