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Alameda County, CA Landscaping Rules: Tree Trimming (2026)

Some Restrictions

Verified 1 month ago|Source: Alameda County Public Works Agency →

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Key Facts

Sidewalk clearance: 8 feet
Street clearance: 14 feet
Chimney clearance: 10 feet (PRC 4291)
Protected trees: Permit may be required
Utility lines: PG&E handles

City-specific rules exist: Oakland, Hayward, Livermore, Berkeley, San Leandro, and Fremont have their own tree trimming rules that differ from Alameda County's county-level regulations. If you live in one of those cities, check the city-specific page instead.

Summary

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.

Full Breakdown

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.

Frequently Asked Questions

Can my neighbor trim my tree?

Yes, a neighbor may trim branches that overhang their property to the property line, but cannot damage the tree or enter your yard without permission.

Do I need a permit to trim my oak tree?

Possibly, if the tree is protected under a local heritage tree ordinance or is in a designated natural resource area; check with Alameda County Planning before major pruning.

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Alameda County, CA Landscaping Rules: Tree Trimming (2026)

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