Tree Removal & Heritage Trees: Simi Valley vs Thousand Oaks
How do tree removal & heritage trees rules compare between Simi Valley, CA and Thousand Oaks, CA?
Thousand Oaks has fewer restrictions than Simi Valley.
Simi Valley, CA
Ventura County
Simi Valley has a tree preservation ordinance that protects native oaks and significant trees from unauthorized removal. Permits are required to remove protected trees, and replacement planting or in-lieu fees are typically required.
View full Simi Valley rules →Thousand Oaks, CA
Ventura County
Thousand Oaks has oak tree preservation protections — no ADUs or structures in protected tree zones. Tree removal permits may be required by TOMC Title 9 for protected species. Contact Community Development for permits.
View full Thousand Oaks rules →Key Facts Comparison
| Fact | Simi Valley | Thousand Oaks |
|---|---|---|
| Protected Species | Native oaks 5+ inch diameter | - |
| Permit Required | Yes, from Community Development | - |
| Replacement Ratio | 2:1 or 3:1 planting required | - |
| Fine Range | $1,000 to $10,000 per tree | - |
| Oak Trees | - | Protected; special permit required |
| ADU Restriction | - | No ADUs in protected tree zones |
| Contact | - | Community Development (805) 449-2133 |
| Topic | - | Tree Removal |
Highlighted rows indicate differences between cities.
Simi Valley FAQ
Do I need a permit to remove a tree in Simi Valley?
A permit is required for native oaks with 5+ inch diameter and other designated significant or heritage trees. Contact Community Development at (805) 583-6800 for determination.
What trees are protected in Simi Valley?
Coast live oaks, valley oaks, scrub oaks, and other trees designated as significant or heritage by the city. Protection applies to trees with trunk diameters of 5 inches or more.
What if a protected tree is dying or dangerous?
Trees posing imminent hazards may be emergency-removed with documentation submitted to Community Development within 10 days. Dying trees still require a permit with an arborist assessment.
Thousand Oaks FAQ
Do I need a permit to remove a tree in Thousand Oaks?
Yes, for protected species (oaks, California sycamores, California walnuts, and other heritage trees 8+ inches in diameter). Non-protected species on private property generally don't require permits. Contact Community Development at (805) 449-2100.
What trees are protected in Thousand Oaks?
All native oaks (coast live oak, valley oak, etc.), California sycamores, California walnuts, and designated heritage trees with trunk diameters of 8+ inches (measured at 4.5 feet above grade).
Can I trim a protected tree without a permit?
Minor pruning (removing less than 25% of the canopy) is generally allowed without a permit. Major pruning, topping, or work that could damage the tree's health requires a permit. Consult a certified arborist for guidance.
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