Skip to main content
CityRuleLookup
Key FactsOrdinance TextFull BreakdownFAQSourcesMore in Alameda County

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

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified April 2026

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

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.

City-specific rules exist: Fremont, Hayward, San Leandro, Oakland, Livermore, and Berkeley 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.

(1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire would be unlikely to ignite the structure.

Source: Alameda County Public Works AgencyView official code

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.

Sources & Official References

Other rules in Alameda County

Water RestrictionsSome RestrictionsArtificial TurfSome RestrictionsTree Removal & Heritage TreesSome RestrictionsNative PlantsSome RestrictionsRainwater HarvestingLight RestrictionsWeed OrdinancesSome RestrictionsParking Rules: Commercial & Oversized VehiclesSignificant RestrictionsParking Rules: Preferential Parking DistrictsSome RestrictionsParking Rules: Loading ZonesSome RestrictionsWater Use Rules: Recycled Water RulesLight RestrictionsHistoric Preservation: Historic-Cultural MonumentsSignificant RestrictionsAccessory Structures: ADU Impact FeesFew Restrictions

All Alameda County rules

California rules heatmap·Compare Alameda County to another location·View the California landscaping rules overview

Get notified when Tree Trimming in Alameda County, CA changes

We'll email you the moment we detect a change in the code. No spam, unsubscribe anytime.

We'll never sell or share your email. One-click unsubscribe in every email.

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.

Tree Trimming in Cities Across Alameda County

Oakland, CAFremont, CAHayward, CABerkeley, CASan Leandro, CALivermore, CACastro Valley, CA