Alameda County requires trimming of trees that obstruct public rights-of-way, block street-sign visibility, or interfere with utility lines. Protected heritage and native oak trees may require a permit before trimming.
Property owners in unincorporated Alameda County are responsible for trimming trees and vegetation on their property that extends into public sidewalks, streets, or right-of-way. Minimum clearances are typically 8 feet over sidewalks and 14 feet over streets. Trees must not block streetlights, stop signs, or sight lines at intersections. The Alameda County Public Works Agency enforces right-of-way clearances and can compel trimming. Protected tree ordinances may apply in certain communities and require a tree permit before removing live wood or performing heavy pruning on native oaks (coast live oak, valley oak), bay laurels, and heritage trees above specified trunk diameters. In VHFHSZ areas, tree branches must be kept 10 feet from chimneys and stovepipes under PRC 4291. PG&E performs utility-line clearance separately. Homeowners should hire ISA-certified arborists for major work.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle tree trimming.
See how Sunol's tree trimming rules stack up against other locations.
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