Mendocino County, CA Swimming Pools & Spas: Pool Permits (2026)
Swimming pool permit rules in Mendocino County, CA, also covering above-ground pools, in-ground pools, and spa installations, set fencing, barrier, alarm, and inspection requirements.
Key Facts
- Permit required by
- County Code §18.08.010(A)
- Issuing agency
- Dept. of Planning and Building Services
- Setback exemption
- §20.456.015(F), side and rear yards
- Permit validity
- 1 year, extendable, renewable up to 5 years
- Coastal Zone parcels
- Coastal Development Permit also required
- Unpermitted work fee
- 1x-3x normal permit fee
Summary
Building a residential pool or spa in unincorporated Mendocino County requires a building permit under County Code § 18.08.010, issued and inspected by the Department of Planning and Building Services. Zoning Code § 20.456.015(F) exempts private pools and hot tubs from side- and rear-yard setbacks, though coastal-zone parcels still need a Coastal Development Permit.
(A)Except as otherwise exempted by the California Building Code and/or other county ordinances, no person, firm, or corporation shall erect, construct, enlarge, alter, repair, move, improve, occupy, remove, convert, or demolish any building or structure in the unincorporated area of the County or cause the same to be done without first obtaining a separate building permit for each such building or structure as required by this Title. Permits shall be issued and fees collected by the Planning and Building Services Department. The schedule of fees collected is adopted from time to time by the Board of Supervisors of the County of Mendocino.
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
010(A). 025(C), the edition that carries the pool construction and safety standards. 015(F) lists "private swimming pools and hot tubs" among the accessory uses allowed by-right in any district that permits a single-family home, and specifically frees them from the side- and rear-yard setback rules that apply to other accessory structures. 015's opening line still subjects every listed accessory use, pools included, to "the granting of a Coastal Development Permit, where applicable," for parcels inside the county's Coastal Zone, where the California Coastal Commission holds appeal rights over the county's permit decision.
5 governs how long the permit stays valid: work must start within one year and get an approved inspection at least once every 365 days or the permit lapses, with the Building Official able to grant 180-day extensions on a written, justified request and a reinstatement fee due for permits lapsed under five years.
Violations & Fines
Pool work done without the required permit is treated the same as any unpermitted construction under Title 18: County Code § 18.08.030 sets a violation fee equal to the normal permit fee if the owner self-reports, double if Planning and Building Services discovers it from a complaint, and triple for a commercial pool. Section 18.04.075 separately makes the underlying Title 18 violation an infraction under Government Code § 25132, chargeable as a new offense each week it continues, and the County can record a lien for unpaid permit costs and penalties after 30 days' written notice.
Frequently Asked Questions
Do I need a permit to build a pool in unincorporated Mendocino County?
Does a pool have to meet the same setbacks as other accessory buildings?
Is a Coastal Development Permit needed for a pool near the coast?
Sources & Official References
Other rules in Mendocino County
California rules heatmap·Compare Mendocino County to another location·View the California swimming pools & spas overview
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