ADU rules in Simi Valley, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Simi Valley permits accessory dwelling units consistent with California ADU laws (Government Code 65852.2). ADUs up to 1,200 square feet are allowed on single-family lots with streamlined permitting and reduced fees.
Under California Government Code 65852.2 and Simi Valley's Development Code, homeowners may build one ADU and one Junior ADU (JADU) on a single-family lot. Detached ADUs may be up to 1,200 square feet with a maximum height of 16 feet (or 18 feet in some configurations). Attached ADUs are limited to 50% of the existing floor area or 1,200 square feet, whichever is less. Garage conversions are exempt from replacement parking requirements per state law. Setbacks for detached ADUs are 4 feet from side and rear property lines. ADUs must have independent exterior access and may include a kitchen and bathroom. The city must approve or deny ADU applications within 60 days. Impact fees are waived for ADUs under 750 square feet.
Building an ADU without a permit is a building code violation resulting in stop-work orders and potential demolition. Unpermitted ADUs may also affect property insurance and resale. The city offers an amnesty program for qualifying existing unpermitted ADUs to come into compliance.
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Side-by-side rule comparisons with other cities in Ventura County.
See how other cities in Ventura County handle adu rules.
See how Simi Valley's adu rules rules stack up against other locations.
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