Altadena, CA Landscaping Rules: Tree Trimming (2026)
Key Facts
- Oak Permit Required
- Yes if entering protected zone
- Code Section
- LA County 22.174.040
- Parkway Trees
- Maintained by LA County DPW
- Utility Pruning
- Allowed with notice (PUC 911)
Summary
Trimming protected oak trees (≥8 in DBH) requires an Oak Tree Permit if the work enters the protected zone or removes >25% of crown. Street trees in the public right-of-way are maintained by LA County Public Works.
4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (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. This subparagraph does not apply to single specimens of trees or other vegetation that are well-pruned and maintained so as to effectively manage fuels and
Full Breakdown
LA County Code Section 22.174.040 prohibits encroachment into the protected zone of any oak ≥8 inches DBH without a permit. Routine pruning of dead wood or canopy thinning under 25% is generally allowed without permit. Trees in the public right-of-way are maintained by LA County Public Works: homeowners typically need DPW permission to trim parkway trees. Section 911 of the California Public Utilities Code allows utilities (SCE, etc.) to trim trees encroaching on power lines for safety, with required notice.
Violations & Fines
Unpermitted oak damage = misdemeanor under 22.174.080: fines up to $1,000 + replacement value. Damage to public right-of-way trees can result in restitution to the County.
Frequently Asked Questions
Can I trim the oak in my Altadena backyard?
Sources & Official References
Other rules in Altadena
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