Garage Conversions: Thousand Oaks vs Ventura
How do garage conversions rules compare between Thousand Oaks, CA and Ventura, CA?
Ventura has fewer restrictions than Thousand Oaks.
Thousand Oaks, CA
Ventura County
Garage conversions to ADUs are allowed under CA state law and TOMC Ord. 1732-NS. Existing setbacks are exempt for conversions. Replacement parking is not required when a garage is converted to an ADU. Interior garage parking spaces must remain for non-ADU structures.
View full Thousand Oaks rules →Ventura, CA
Ventura County
Ventura allows conversion of existing attached or detached garages to Accessory Dwelling Units (ADUs) under SBMC Chapter 24.430 and Cal. Gov. Code §65852.2. Conversion ADUs are processed ministerially (no discretionary review), replacement parking is not required, and the converted space is exempt from minimum setbacks if within the existing footprint.
View full Ventura rules →Key Facts Comparison
| Fact | Thousand Oaks | Ventura |
|---|---|---|
| Conversion Allowed | Yes (ADU use) | - |
| Setback Exemption | Existing setbacks apply | - |
| Replacement Parking | Not required | - |
| Non-ADU Garages | Must maintain interior parking spaces | - |
| Code | - | SBMC Ch. 24.430 + Cal. Gov. Code §65852.2 |
| Review type | - | Ministerial (no discretionary review) |
| Replacement parking | - | Not required (state preempted) |
| Setback exemption | - | Existing garage footprint exempt |
| JADU max | - | 500 sq ft attached, single-family only |
Highlighted rows indicate differences between cities.
Thousand Oaks FAQ
Can I convert my garage to living space in Thousand Oaks?
Yes. Under California's JADU law, you can convert a garage to a Junior ADU (up to 500 sq ft) by right. It must include a cooking facility, bathroom, and separate entrance. Building permits are required.
Do I need to provide replacement parking?
No. State law eliminated replacement parking requirements for garage conversions to ADUs and JADUs. You can convert your entire garage without providing substitute parking.
Do I have to live in the JADU?
JADUs require owner-occupancy of either the JADU or the primary dwelling. Full ADU conversions (over 500 sq ft) do not have this requirement under current state law.
Ventura FAQ
Can I convert my garage to an ADU in Ventura?
Yes. Under SBMC Chapter 24.430 and Cal. Gov. Code §65852.2, Ventura must approve garage-to-ADU conversions on a ministerial basis. You still need a building permit for habitability work.
Do I have to replace the garage parking?
No. California state law (Gov. Code §65852.2) preempts any local requirement to replace lost garage parking when the garage is converted to an ADU.
Can I add a second story above a converted garage?
Yes. State ADU law allows a two-story ADU/attached ADU up to 25 feet, and a detached ADU above a garage up to 18 feet (20 ft for roof pitch). Maintain at least 4-ft side/rear setbacks on the second story.
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