Thousand Oaks has a strong tree protection program regulating trimming and pruning of protected trees. The city's Heritage Tree Ordinance protects oaks, sycamores, and walnuts of qualifying size, requiring permits for significant trimming.
The Thousand Oaks Heritage Tree Ordinance protects native trees including coast live oaks, valley oaks, California black walnuts, and California sycamores. Trees with a trunk circumference of 30 inches or more measured at 4.5 feet above grade are designated Heritage Trees. Trimming that removes more than one-third of the foliage or significantly alters the tree's natural shape requires a permit from the Community Development Department. Routine maintenance such as removing dead branches, thinning for air circulation, and raising the canopy for clearance is generally allowed. The city employs arborists who review trimming applications and may conduct site inspections. Improper topping of heritage trees is specifically prohibited. The city's extensive open space preserves and oak woodland corridors make tree protection a high community priority.
Unauthorized trimming of heritage trees: $1,000-$25,000 per tree depending on the extent of damage. Topping a heritage tree may result in maximum penalties plus required remediation. The city may require a certified arborist assessment and restoration plan at the owner's expense. Repeated violations may result in misdemeanor prosecution.
Thousand Oaks, CA
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Side-by-side rule comparisons with other cities in Ventura County.
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