Ventura County, CA Accessory Structures: Garage Conversions (2026)

Garage conversions in unincorporated Ventura County are governed by the County's ADU/JADU regulations in NCZO Sec. 8107-1.7. Under Sec. 8107-1.7.4(a), one ADU created within the existing space of an accessory structure such as a garage (attached or detached) is approved by building permit; the existing structure may be expanded by no more than 150 square feet solely to accommodate ingress and egress. Conversions need only meet Building Code and Fire Code setback requirements, even where existing setbacks are legal nonconforming, so no additional zoning setback is imposed. A key state-aligned benefit: under Sec. 8107-1.7.5(c) and Sec. 8107-1.7.7(c), when a garage, carport or covered parking structure is demolished or converted in conjunction with an ADU, those off-street parking spaces do not need to be replaced for the primary dwelling, and a demolition permit for a detached garage replaced by an ADU is issued at the same time as the ADU permit. Alternatively, an attached garage can be converted into a JADU under Sec. 8107-1.7.6: the JADU must be 500 sq ft or less, created within the walls of the single-family dwelling (attached garages count as within those walls), include an efficiency kitchen, and have a separate entrance. No replacement parking is required for a JADU created from a garage. All these approvals are ministerial under Sec. 8107-1.7.7.