Tree Trimming: Simi Valley vs Thousand Oaks
How do tree trimming rules compare between Simi Valley, CA and Thousand Oaks, CA?
Simi Valley has fewer restrictions than Thousand Oaks.
Simi Valley, CA
Ventura County
Simi Valley requires property owners to maintain trees so they do not encroach on public sidewalks, streets, or neighboring properties. The city has a tree preservation ordinance protecting certain native and significant trees from unauthorized removal.
View full Simi Valley rules →Thousand Oaks, CA
Ventura County
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.
View full Thousand Oaks rules →Key Facts Comparison
| Fact | Simi Valley | Thousand Oaks |
|---|---|---|
| Sidewalk Clearance | 8 feet minimum | - |
| Street Clearance | 14 feet minimum | - |
| Protected Trees | Native oaks and heritage trees | Oaks, sycamores, walnuts (30" circumference+) |
| Street Trees | City-maintained, do not prune | - |
| Permit Required | - | Removal of >1/3 of foliage |
| Topping Prohibited | - | Strictly prohibited for heritage trees |
| Penalty Range | - | $1,000-$25,000 per tree |
| Contact | - | Community Development (805) 449-2100 |
Highlighted rows indicate differences between cities.
Simi Valley FAQ
Can I trim a tree that hangs over my property line?
You may trim branches that encroach onto your property up to the property line, but you cannot trespass or damage the tree's health. Protected trees have additional restrictions.
Who trims trees along city streets?
Street trees in the public right-of-way are maintained by the city's Public Works Department. Do not prune city trees without authorization.
Do I need a permit to trim my trees?
General maintenance trimming does not require a permit. However, significant pruning of protected native oaks or heritage trees may require approval under the tree preservation ordinance.
Thousand Oaks FAQ
What trees are protected in Thousand Oaks?
Coast live oaks, valley oaks, California black walnuts, and California sycamores with a trunk circumference of 30 inches or more at 4.5 feet above grade are protected Heritage Trees. The city also protects trees required as conditions of development approval.
Can I trim my heritage tree without a permit?
Routine maintenance such as removing dead branches and light thinning is allowed. Trimming that removes more than one-third of the foliage or significantly alters the tree's shape requires a permit from Community Development at (805) 449-2100.
What is tree topping and is it allowed?
Topping is the indiscriminate cutting of branches to stubs, which damages tree health and structure. It is strictly prohibited for heritage trees in Thousand Oaks and can result in fines up to $25,000.
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