Driveway approaches onto county roads in unincorporated Marin County require an encroachment permit from County Public Works and must meet sight-distance, drainage and (in fire areas) emergency-access standards.
In unincorporated Marin County, the driveway itself is your business, but where it meets the county road is the county's. A new or modified driveway approach onto a county road requires an encroachment permit from County Public Works, and the design has to satisfy sight-distance and drainage standards so it doesn't create a hazard or send runoff onto the roadway. In fire-prone areas the bar rises further, with emergency-access standards ensuring fire apparatus can reach the property. Given Marin's narrow roads and steep terrain, involve Public Works early — approach geometry can constrain the whole project.
Contact your local code enforcement office for specific penalty information.
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Marin County, CA
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