Thousand Oaks, CA Tree Protection: Protected Tree Species (2026)
Key Facts
- Protected species diameters
- Sycamore >12"; Bay Laurel, Black Walnut, Toyon >8"
- Homeowner exemption
- No permit needed on occupied single-family lots under 2 acres
- Historic Tree designation
- Made by City Council as Cultural Heritage Board
- Unpermitted violation penalty
- Misdemeanor + replant 2+ equivalent trees
Summary
Beyond oaks, Thousand Oaks separately protects "landmark trees", mature California Sycamores, Bay Laurels, Black Walnuts, and Toyons that exceed specific trunk-diameter thresholds, plus any tree the Planning Commission or City Council designates during a project approval. A landmark tree permit is required to cut, remove, or encroach on one, and violations are a misdemeanor with mandatory replanting.
"Landmark tree" shall mean a tree that because of its size, age, or unique and irreplaceable values to the community needs to be preserved and safeguarded as symbolic of the City's heritage, beauty and image. Landmark trees shall include specimens of the following species which have reached the designated maturity: Platanus racemosa, (California Sycamore) which exceed twelve (12") inches in diameter when measured at a point four and one-half (4-1/2') feet above the natural grade at the base of the tree; Umbellularia californica, (California Bay Laurel) ... which exceed eight (8") inches in diameter ...; Juglans californica, (California Black Walnut) which exceed eight (8") inches in diameter ...; Heteromeles (Photinia) arbutifolia, (California Holly) or (Toyon) which exceeds eight (8") inches in diameter ... above the natural grade at the base of the tree.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-78: 2026 S-78 Supplement contains: Current city legislation passed through March 31, 2026).
Full Breakdown
Trees with multiple trunks qualify if the combined trunk diameters exceed the single-trunk threshold plus 2 inches. The City Council, sitting as the Cultural Heritage Board, can also designate individual trees as "Historic Trees" for extra protection (§9-4.4310). Notably, a permit is NOT required to cut, remove, or relocate a landmark tree located on an occupied single-family lot smaller than two acres (§9-4.4304(b)(4)): a significant carve-out for most homeowners. Where a permit is required, removal of a designated historic tree or of a non-exempt landmark tree 24 inches or larger in diameter must go to the Planning Commission for a hearing (§9-4.4305(a)(2)); smaller/fewer-tree requests can be approved administratively.
Violations & Fines
Any violation is a misdemeanor under TOMC §9-4.4308(a), and the violator may also be required to pay restitution by planting two or more replacement landmark trees of equivalent size and value, as determined by the Community Development Director (§9-4.4308(b)).
Frequently Asked Questions
Does my backyard sycamore need a landmark tree permit before I trim it?
How does a tree get the "Historic Tree" label?
Sources & Official References
Other rules in Thousand Oaks
California rules heatmap·Compare Thousand Oaks to another location·View the California tree protection overview
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Protected Tree Species in Nearby Cities
How other cities in Ventura County handle protected tree species.