Mendocino County, CA Building Safety: Plumbing Permits (2026)
Key Facts
- Adopted code
- CA Plumbing Code 2025, Part 5 (§18.04.025(F))
- Permit expires
- After 1 year without approved inspection
- Extensions
- Up to 180 days, written justified request
- Refunds
- Up to 80% of permit/plan-review fee
- Hose bibb rule
- Backflow/vacuum protection required (§603.5.7)
- Exterior bibb
- One required per Group R home
Summary
Mendocino County adopts the 2025 California Plumbing Code at County Code § 18.04.025(F) and rewrites its permit-expiration and refund sections at § 18.04.055: work must start and pass inspection within a year, extensions run up to 180 days, and outdoor hose bibbs need integral backflow protection.
Expiration: Every permit issued shall become invalid if the work on the site authorized by such permit is not commenced within one (1) year (365 calendar days) after the issuance of said permit and an inspection resulting in an approval of the work has not been obtained; or if after the first inspection approval the work does not receive an inspection resulting in an approval every year (365 calendar days). However, this provision will not apply if the permit was issued to legalize previously unpermitted construction.
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
055 amends the code's own administrative sections. " The Building Official may grant extensions "for periods not more than 180 days each" on written request showing justifiable cause, and a permit lapsed under five years can be reinstated for a fee the Board of Supervisors sets. 3, on fee refunds, lets the Building Official refund an erroneously collected fee in full and up to 80 percent of a permit or plan-review fee if the applicant files a written request within a year. an atmospheric vacuum breaker," with a self-draining frost-proof bibb required in freezing climates, and every Group R Division 1 or 3 structure must have at least one exterior hose bibb on potable water.
Violations & Fines
Plumbing work performed without a valid permit, or an outlet installed without the required backflow protection under § 603.5.7, is enforced the same way as other Title 18 violations: § 18.08.030's violation fee runs from the normal permit fee (self-reported) to double (County-discovered) to triple (commercial/industrial), and § 18.04.075 makes the underlying violation an infraction under Government Code § 25132, chargeable weekly until fixed, with a lien available against the property after 30 days' notice.
Frequently Asked Questions
How long do I have to start work after getting a Mendocino County plumbing permit?
Does every outside faucet need special backflow protection?
Can I get a refund if I cancel my plumbing permit?
Sources & Official References
Other rules in Mendocino County
California rules heatmap·Compare Mendocino County to another location·View the California building safety overview
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