ADU rules in Modesto, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Modesto allows Accessory Dwelling Units (ADUs) on residential lots per California state law (Government Code §65852.2). ADUs up to 800 sq ft are permitted by right on single-family lots. Larger ADUs up to 1,200 sq ft may be allowed depending on lot size.
Under California Government Code §65852.2 and Modesto's local ADU ordinance, ADUs are permitted on all residential lots. A Junior ADU (JADU) up to 500 sq ft converted from existing space is allowed in addition to a standard ADU. ADUs up to 800 sq ft are permitted by right with no discretionary review. Larger ADUs up to 1,200 sq ft may be permitted depending on lot size and zoning. ADUs must meet setback requirements (typically 4 ft for rear and side). No additional parking is required for ADUs within half a mile of public transit. Impact fees are waived for ADUs under 750 sq ft per state law. Building permits are required. ADUs may be attached, detached, or garage conversions.
Unpermitted ADU: notice to obtain permit. Non-compliant ADU: correction notice or abatement.
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See how Modesto's adu rules rules stack up against other locations.
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