Yuba County, CA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- Fee-free threshold
- Under 750 sq ft: no impact fee
- Larger ADUs
- Fee prorated to primary dwelling size
- School fees
- Only above 500 sq ft (Ed. Code § 17620)
- Citation
- Yuba County Code § 11.32.030(j)(11)
Summary
Unincorporated Yuba County charges no development impact fee on accessory dwelling units under 750 square feet, and prorates fees by size for larger ADUs, under Section 11.32.030(j)(11).
Fees will be charged for the construction of accessory dwelling units, in accordance with Chapter 13.50 of the Yuba County Development Code and state law.a.The County, special district, or water corporation shall not impose any impact fee upon the development of an accessory dwelling unit less than 750 square feet.b.Any impact fees charged for an accessory dwelling unit of 750 square feet or more shall be charged proportionately in relation to the square footage of the primary dwelling unit.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 6).
Full Breakdown
Section 11.32.030(j)(11) implements state ADU fee law locally: the County, a special district, or a water corporation may not impose any impact fee on an ADU smaller than 750 square feet, and any impact fee charged on an ADU of 750 square feet or more must be prorated to the square footage of the primary dwelling rather than charged as a flat per-unit fee. School districts may still levy fees on ADUs larger than 500 square feet under Education Code Section 17620, but smaller ADUs are exempt from school fees too.
Violations & Fines
A jurisdiction or district charging a flat impact fee on a sub-750-square-foot ADU, or a disproportionate fee on a larger one, is not following Section 11.32.030(j)(11); applicants can raise this during building-permit review.
Frequently Asked Questions
Will Yuba County charge impact fees on a small ADU?
What about a larger ADU, say 900 square feet?
Sources & Official References
Other rules in Yuba County
California rules heatmap·Compare Yuba County to another location·View the California accessory structures overview
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