Yolo County, CA Building Safety: Building Permits (2026)
Key Facts
- Governing code
- 2019 California Building Code, as adopted
- Deck exemption
- ≤200 sq ft, ≤30 inches above grade
- Ag building exemption
- Requires prior CBO approval
- Permit lifespan
- Void after 12 months unstarted
- Renewal fee
- Half of original permit fee
- Violation penalty
- Up to $500 fine or 6 months jail
Summary
Yolo County adopted the 2019 California Building Code as its Title 7, Chapter 1 permit system for the unincorporated area. A permit is required for construction work unless it falls under one of the county's narrow amended exemptions: small residential decks and specific agricultural buildings approved in advance by the Chief Building Official.
(3) Section 105.2-Work exempt from permit is amended to include subsections 105.2(14)- and 105.2(15)-Permit Exempt Agricultural Buildings. Section 105.2(14). Residential Decks, Decks for Group R-3 occupancies and Group U occupancies accessory to R-3 occupancies, not exceeding 200 square feet (18.58 m2) in area, that are not more than 30 inches (762 mm) above grade at any point, are not attached to a dwelling and do not serve the exit door required by California Residential Code (CRC) section R311.2–Egress door. Section 105.2(15). Permit Exempt Agricultural Buildings. An agricultural building that the Chief Building Official determines satisfies the conditions set forth in Appendix C-Group U Agricultural Buildings subsection C105-Permit Exempt Agricultural Buildings as provided in YCC Section 7-1.04(b). An application for exemption shall be filed in accordance with subsection C105.1-Application for exemption.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-21: Supplement 2026 S-21 includes: Local legislation current through Ord. 1584, effective June 25, 2026).
Full Breakdown
03 adopts Chapter 1, Divisions I and II of the 2019 California Building Code, which includes the state's Section 105 permit rules, as the administrative provisions governing Title 7 of the Yolo County Code. 2 (Work Exempt From Permit) to add two county-specific exemptions. 2. 1. Everything else, additions, alterations, new structures, and larger accessory buildings, needs a building permit issued by the Chief Building Official before work begins. 5 (Expiration), sets the permit's shelf life: a permit becomes null and void if work is not started within 12 months of issuance, or if work is suspended or abandoned for 180 days.
Restarting after expiration requires a brand-new permit application, and if no plan changes are involved and the lapse has not exceeded one year, the county charges only half the original permit fee for the do-over. Homeowners planning fence, deck, or outbuilding work in unincorporated Yolo County should confirm exemption eligibility with the Building Division before starting, since the exemptions are narrow and fact-specific rather than automatic.
Violations & Fines
Working without a required permit is enforced under the county's general penalty section, Yolo County Code Sec. 1-2.01: any violation of a Code requirement, including the adopted Building Code, is a misdemeanor punishable by up to a $500 fine, up to six months in County Jail, or both, with each day the violation continues charged as a separate offense. Letting a permit expire and rebuilding later without a new one triggers the same exposure, on top of the half-fee renewal cost under Section 105.5.
Frequently Asked Questions
Do I need a permit to build a deck in unincorporated Yolo County?
Are agricultural buildings exempt from permits?
What happens if my building permit expires?
What is the penalty for building without a permit in Yolo County?
Sources & Official References
Other rules in Yolo County
California rules heatmap·Compare Yolo County to another location·View the California building safety overview
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