ADU rules in Nevada County, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
In unincorporated Nevada County, ADUs and JADUs are reviewed ministerially and are governed primarily by California State ADU Law (Gov. Code 66310 et seq.). A completed application must be approved or denied within 60 days, ADUs need only 4-foot side and rear setbacks, and no owner-occupancy may be required.
Accessory dwelling units in unincorporated Nevada County are processed by the Community Development Agency Planning Department as a ministerial (non-discretionary) action, meaning no public hearing or design review. County guidance states ADUs must meet 4-foot rear and side yard setbacks and remain consistent with the zoning of the parcel. Because California ADU Law (Gov. Code 66310-66342) preempts most local standards, the County applies state rules: a local agency may not set a maximum ADU size below 850 sq ft (1,000 sq ft for a unit with more than one bedroom), and must approve an ADU of up to 800 sq ft regardless of other standards (Gov. Code 66321). The County's general size cap referenced in materials is 1,200 sq ft. A completed ADU or JADU application is deemed approved if not acted on within 60 days (Gov. Code 66317). Owner occupancy may not be required for ADUs (Gov. Code 66315). Note: HCD advised the County in October 2025 that its 2019 ADU ordinance may be outdated; where a local ordinance conflicts with state law it is null and void and state standards control (Gov. Code 66316). ADUs require separate utility disconnects and a new address is assigned.
Building or occupying an ADU without required building permits, or failing to obtain ministerial planning approval, can trigger code enforcement; unpermitted units may be required to be permitted or removed, though state law (Gov. Code 66331/66332) provides delayed enforcement and amnesty paths for certain pre-2020 units.
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