ADU rules in Martinez, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Martinez complies with California Gov Code §65852.2 (statewide ADU law). One ADU and one JADU (up to 500 sq ft) are permitted per single-family lot. Detached ADUs up to 1,200 sq ft; attached up to 1,000 sq ft or 50% of primary home. 4-ft rear/side setbacks for new detached ADUs. ADUs under 750 sq ft exempt from impact fees. ADUs cannot be used as STRs per city's STR prohibition.
Martinez allows ADUs and JADUs per MMC Chapter 22.43. The city offers free pre-approved ADU building plans from William Wood Architects. ADUs under 750 sq ft are not subject to impact fees; larger ADUs pay proportional fees. California AB 1033 (effective Jan 1, 2024) permits separate sale of ADUs, and Martinez has opted in through the condominium plan process. The city also has an amnesty program for unpermitted dwelling units.
Cities cannot deny conforming ADU applications. Unpermitted ADU construction: standard building code enforcement.
Martinez, CA
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Side-by-side rule comparisons with other cities in Contra Costa County.
See how other cities in Contra Costa County handle adu rules.
See how Martinez's adu rules rules stack up against other locations.
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