ADU rules in Murrieta, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Murrieta regulates accessory dwelling units under MMC §16.44.160, implementing California Government Code §65852.2. Detached ADUs up to 1,200 sqft and JADUs up to 500 sqft are permitted by right on single-family lots.
Per MMC §16.44.160, accessory dwelling units are permitted on all single-family residential lots through ministerial (non-discretionary) approval. Detached ADUs may be up to 1,200 square feet with a maximum height of 16 feet. JADUs (Junior ADUs) up to 500 square feet are permitted by right within the existing primary dwelling footprint. One parking space is required for the ADU unless the property is within 0.5 miles of a transit stop or bus route. No owner-occupancy requirement per AB 976. ADUs may not be used as short-term rentals (less than 31 days). Impact fees are waived for ADUs under 750 square feet. The city processes ADU applications within 60 days as required by state law.
Unpermitted ADU construction: stop-work order and retroactive permit requirement. STR use of ADU: citation and fines. Non-compliant construction: corrections required per building code.
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Side-by-side rule comparisons with other cities in Riverside County.
See how other cities in Riverside County handle adu rules.
See how Murrieta's adu rules rules stack up against other locations.
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