Mendocino County, CA Solar Energy: Panel Permits (2026)
Key Facts
- Governing chapter
- Mendocino County Code Ch. 18.40
- Enacted
- Ord. No. 4344, 10-6-2015
- Max system size
- 10 kW AC or 30 kW thermal
- Eligible buildings
- Single or duplex dwellings only
- Legal basis
- Gov. Code § 65850.5 (AB 2188)
Summary
Mendocino County processes small residential rooftop solar permits through an administrative, nondiscretionary checklist the Building Official adopts and posts on the county website, capped at systems no larger than 10 kilowatts AC or 30 kilowatts thermal on a single or duplex dwelling. The checklist tracks the state's Solar Permitting Guidebook and can only be adjusted for documented local conditions.
The Director of Planning and Building Services shall adopt an administrative, nondiscretionary expedited review process for small residential rooftop solar energy systems, including standard plans and checklists. The permit process, standard plans and checklists shall set forth all requirements with which the small residential rooftop energy system must comply in order to be eligible for expedited review, and shall substantially conform to recommendations for expedited permitting, including the checklists and standard plans, contained in the most current version of the California Solar Permitting Guidebook adopted by the Governor's Office of Planning and Research ("Guidebook").
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 75).
Full Breakdown
40, enacted by Ord. No. 5 (the Solar Rights Act as amended by AB 2188), applies only to small residential rooftop solar systems in the unincorporated county. 020 defines a qualifying system as one rated no larger than 10 kilowatts AC or 30 kilowatts thermal, installed on a single or duplex family dwelling, meeting state fire, structural, and electrical codes and Civil Code section 714(c)(3). Under Sec. 030, the Director of Planning and Building Services must adopt standard plans and checklists conforming to the California Solar Permitting Guidebook published by the Governor's Office of Planning and Research, and may deviate from the Guidebook only where the Director documents unique climatic, geological, seismological, or topographical conditions and posts that documentation publicly.
55, 66015, and 66016, and Health and Safety Code section 17951. Applicants can submit in person, by mail, or electronically with an e-signature, and the county cannot condition approval on approval from a homeowners' association under Civil Code section 4080. Systems legally installed before the chapter took effect are grandfathered unless later modifications materially change size, type, or components.
Violations & Fines
The Building Official may withhold permit issuance if there is a violation on record for the structure under review. Once a permit issues, no small residential rooftop solar energy system may be operated until it complies with the terms of that permit; the county performs a post-installation inspection, and a separate fire inspection applies if no agreement exists with the local fire authority to handle safety inspections on the county's behalf.
Frequently Asked Questions
What size rooftop solar system qualifies for Mendocino County's streamlined permit?
Can Mendocino County require its own custom solar checklist instead of the state's?
Can my homeowners' association block my solar permit in Mendocino County?
Sources & Official References
Other rules in Mendocino County
California rules heatmap·Compare Mendocino County to another location·View the California solar energy overview
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