Yolo County, CA Solar Energy: Expedited Solar Permitting (2026)
Key Facts
- Small system cap
- 10 kW AC or 30 kW thermal
- Roof-mount height limit
- 5 ft PV / 7 ft thermal above roof
- Default approval
- Building Permit + Zoning Clearance (ministerial)
- Use Permit trigger
- Specific adverse impact, Gov. Code §65850.5
- Legal basis
- Solar Rights Act, AB 2188 (2014)
- Larger systems
- Site Plan Review or Use Permit above 2.5 acres
Summary
Small rooftop or ground-mounted solar systems up to 10 kW alternating current, or 30 kW thermal, are approved in every zone of unincorporated Yolo County through a ministerial Building Permit and Zoning Clearance, with no discretionary hearing, under Sec. 8-2.1104. The county can only force a Use Permit if the Building Official finds a specific, adverse health or safety impact.
(4) To streamline the solar permitting process that complies with the Solar Rights Act and AB 2188 (Chapter 21, Statutes 2014) to achieve timely and cost-effective installations of small accessory use solar energy systems, as defined below. ... (4) Small accessory use roof-mounted and ground-mounted solar energy systems may be approved in all zones through the issuance of a Building Permit and a Zoning Clearance, provided the application meets setback and other standards, as provided in this Section. However, consistent with Section 65850.5 of the California Government Code, if the Chief Building Official has a good faith belief that the solar energy system could have a specific, adverse impact upon the public health and safety, the Official may require the applicant to apply for a Use Permit.
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
Sec. ' Subsection (b) defines a 'small accessory use ground-mounted' or 'roof-mounted' solar energy system as one no larger than 10 kilowatts alternating current, or 30 kilowatts thermal, with roof-mounted panels capped at 5 feet above the roofline for photovoltaic systems and 7 feet for thermal systems. Subsection (d)(4) makes approval ministerial: these small systems 'may be approved in all zones through the issuance of a Building Permit and a Zoning Clearance, provided the application meets setback and other standards,' with no discretionary review or public hearing.
5 of the California Government Code,' the Chief Building Official has a good-faith belief the installation could cause a specific, adverse impact on public health or safety, in which case the applicant must instead apply for a Use Permit reviewed by the Zoning Administrator under the state statute's standards. 5 acres generally need a ministerial Site Plan Review under subsection (d)(5), while medium-sized systems on prime farmland or Williamson Act land, and large-scale systems, require a Minor, Major, or Board-level Use Permit under subsections (d)(6), (8) and (9).
Violations & Fines
Installing a solar energy system without the required Building Permit and Zoning Clearance, or exceeding the small-system size or height limits without the corresponding Use Permit, is enforced as a general Yolo County Code violation under Sec. 1-2.01: a misdemeanor punishable by up to a $500 fine, up to six months in county jail, or both, with each day of noncompliance a separate offense, in addition to any stop-work order or permit denial issued by the Building Official.
Frequently Asked Questions
Do I need a discretionary permit for rooftop solar in unincorporated Yolo County?
Can the county require a Use Permit for a small home solar system?
How tall can a roof-mounted solar panel be in Yolo County?
What if my ground-mounted solar array is larger than a typical home system?
Sources & Official References
Other rules in Yolo County
California rules heatmap·Compare Yolo County to another location·View the California solar energy overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.