ADU Impact Fees: Oxnard vs Thousand Oaks
How do adu impact fees rules compare between Oxnard, CA and Thousand Oaks, CA?
Oxnard and Thousand Oaks have similar restriction levels.
Oxnard, CA
Ventura County
Oxnard cannot impose impact fees on any ADU under 750 square feet — an absolute prohibition under Cal. Gov. Code §65852.2(f)(3)(A). ADUs of 750 sf or larger pay impact fees proportional in square footage to the primary dwelling. Building permit fees, plan-check fees, and school facilities fees on ADUs of 500 sf or larger (under Cal. Ed. Code §17620) still apply.
View full Oxnard rules →Thousand Oaks, CA
Ventura County
California Government Code §65852.2(f) prohibits Thousand Oaks from charging any impact fees on ADUs smaller than 750 square feet. ADUs of 750 sq ft or larger may be charged impact fees only in proportion to the primary dwelling's size. Utility connection fees for ADUs within an existing home are similarly capped by state law.
View full Thousand Oaks rules →Key Facts Comparison
| Fact | Oxnard | Thousand Oaks |
|---|---|---|
| Governing Law | Cal. Gov. Code §65852.2(f)(3) | - |
| Under 750 sf | No impact fees - absolute waiver | - |
| 750+ sf | Proportional to primary dwelling | - |
| School Fees | Apply to ADUs >=500 sf (Ed. Code §17620) | - |
| Collected By | Oxnard Building Division | - |
| Under 750 sq ft | - | No impact fees allowed |
| 750+ sq ft | - | Proportional to primary unit |
| Statute | - | Gov. Code §65852.2(f) |
| School District | - | Conejo Valley USD (fees on ADUs 500+ sq ft) |
| Estimate Office | - | Community Development, 805-449-2100 |
Highlighted rows indicate differences between cities.
Oxnard FAQ
Will I pay impact fees on a small Oxnard ADU?
No. Cal. Gov. Code §65852.2(f)(3)(A) prohibits Oxnard from charging impact, connection, or capacity fees on any ADU under 750 sf. Plan-check and building permit fees based on construction valuation still apply, as do school facilities fees for ADUs at or above 500 sf.
What if my Oxnard ADU is 1,000 sf?
Cal. Gov. Code §65852.2(f)(3)(B) caps the impact fee at an amount proportional in square footage to the primary dwelling's impact fee. The City cannot charge a flat ADU fee — it must be size-proportional. School fees still apply at the Level 1 rate under Cal. Ed. Code §17620.
Thousand Oaks FAQ
Do I have to pay impact fees on a Thousand Oaks ADU?
No, if your ADU is under 750 square feet — state law (Gov. Code §65852.2(f)) prohibits any impact fees on ADUs below that threshold. ADUs 750 sq ft and larger pay fees only in proportion to the size of the primary dwelling.
Do I need a new water or sewer connection for my Thousand Oaks ADU?
Not for an ADU created within an existing single-family home — state law forbids requiring a separate utility connection in that case. A new detached ADU may require separate metering or capacity fees depending on the utility provider and existing service.
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