ADU Impact Fees: Thousand Oaks vs Ventura
How do adu impact fees rules compare between Thousand Oaks, CA and Ventura, CA?
Thousand Oaks and Ventura have similar restriction levels.
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 →Ventura, CA
Ventura County
California law prohibits Ventura from charging impact fees on ADUs under 750 square feet (Gov. Code § 66477.5, formerly § 65852.2(f)(3)). ADUs of 750 sq ft or larger may be charged impact fees proportional to the primary dwelling's square footage.
View full Ventura rules →Key Facts Comparison
| Fact | Thousand Oaks | Ventura |
|---|---|---|
| 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 | - |
| Impact fee exemption | - | ADUs < 750 sq ft pay $0 in impact fees (Gov. Code § 66477.5) |
| ADU ≥ 750 sq ft | - | Fee must be proportional to primary dwelling square footage |
| What counts | - | Development impact, capacity, connection charges; not actual utility connection labor |
| School fees | - | Subject to Ed. Code § 17620 / Gov. Code § 65995 proportional rules |
| Enforcement | - | HCD oversight under Gov. Code § 65852.2(j) |
Highlighted rows indicate differences between cities.
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.
Ventura FAQ
Will I pay impact fees on a 700 sq ft ADU in Ventura?
No. State law (Gov. Code § 66477.5) prohibits any impact fee on ADUs under 750 sq ft. You will still pay standard plan check and building permit fees.
What if my ADU is 900 sq ft?
The city may charge impact fees, but only in proportion to the primary dwelling — calculated as ADU square footage divided by primary square footage.
Does this include school fees and utility connections?
School impact fees are subject to the same proportionality rule. Utility connection fees that reflect actual labor costs are not 'impact fees' and may still be charged.
Compare other topics
See how Thousand Oaks and Ventura compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool