ADU rules in Isleton, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
California state ADU law (Gov Code 65852.2) overrides most local rules. Isleton must allow up to 800 sq ft detached ADUs with 4-foot setbacks. Delta flood zone adds FEMA elevation requirements.
California Government Code 65852.2 requires Isleton to permit Accessory Dwelling Units on residential lots. Minimum standards the city cannot restrict below include up to 800 square feet detached, 4-foot side and rear setbacks, no replacement parking within one-half mile of transit, 60-day permit processing, and no impact fees for ADUs under 750 square feet. AB 1033 (2024) allows separate condo-style sale of ADUs if the city opts in. Because Isleton sits entirely within FEMA Special Flood Hazard Area (Zone AE and AH), new ADU construction must meet base-flood-elevation requirements, typically elevating living space 1 foot above BFE. SB 5 Delta 200-year flood protection adds complexity for larger developments.
Contact your local code enforcement office for specific penalty information.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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