Fences up to 6 feet tall in unincorporated Marin County generally do not require a building permit if they comply with zoning. Fences exceeding 6 feet, or in coastal/design-review zones, require a Planning Division permit and may require building permits under Title 19.
Marin County's Building Code (Title 19) and Development Code (Title 22) work together on fence permitting. Under the California Building Code adopted by Marin Title 19 § 19.04, fences not over 6 feet high are work exempt from a building permit (CBC § 105.2 exemption #2). Marin County's Building and Safety Division confirms that fences exceeding 6 feet in height require a Planning Division permit, and on rural lots of 1 acre or more, no permit is needed if all zoning regulations are met. Fences in the Coastal Zone may require a Coastal Permit under Chapter 22.68 unless categorically excluded, and fences in design-review districts may trigger Design Review under Chapter 22.42. Any fence exceeding the height standards of § 22.20.050 also requires a variance under Chapter 22.54.
Building a fence over 6 feet without the required Planning Division or building permit subjects the owner to stop-work orders, after-the-fact permit fees (typically doubled), and required removal or modification.
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