California 2025 / Contra Costa County building codes

What's in this group11 books

Local amendments & ordinances

The layer that trips people up. You can know the state requirement perfectly and still get a comment because Contra Costa County changed it.

• Contra Costa County Code of Ordinances

Model & state codes

• 2025 California Administrative CodeCAC
• 2025 California Building CodeCBC
• 2025 California Energy CodeCEnC
• 2025 California Existing Building CodeCEBC
• 2025 California Fire CodeCFC
• 2025 California Green Building Standards CodeCGBC
• 2025 California Historical Building CodeCHBC
• 2025 California Reference Standards CodeCRSC
• 2025 California Residential CodeCRC
• 2025 California Wildland-Urban Interface CodeCWUIC

Related code groups

Other editions for Contra Costa County, and neighbouring jurisdictions on the same cycle.

• California 202510
• California Fire 202510
• California 201610
• California 201912
• California 20229
• California 2025 / Central Fire of Santa Cruz County4
• California 2025 / LA County13
• California 2025 / Marin County13
• California 2025 / Sacramento County18

Questions

Which codes does Contra Costa County use?

Contra Costa County is covered by 11 books in Ichi, on the 2025 cycle: CAC, CBC, CEnC, CEBC, CFC, CGBC, and 5 more. The full list is above.

Does Ichi include Contra Costa County's local amendments?

Yes — 1 local book: Contra Costa County Code of Ordinances. Amendments are loaded as first-class books, not footnotes on the model code, so an answer reflects what Contra Costa County actually enforces.

How current is this code group?

Code groups are maintained in the Ichi platform and this page reflects that library directly. New books, editions and amendments are added on an ongoing basis, and jurisdictions can be added on request.

Can I read the full code text here?

This page lists coverage — which books, which edition, which amendments. The code text itself lives inside Ichi, where it's delivered under our licensing agreements with the ICC and other publishers, and where every answer links to the exact section it came from.