Corona, CA Accessory Structures: ADU Rules (2026)

030(C). 030(E) bars selling an ADU separately from the primary unit while permitting rentals of 30 days or longer only, since short-term rentals under 30 days are prohibited for either unit. 030(K) caps density at two ADUs on a single-family lot, in combinations such as one detached ADU plus one junior ADU, or two junior ADUs, provided side and rear setbacks remain sufficient for fire and safety; multi-family lots may add ADUs in up to 25% of existing units plus as many as eight detached units, not exceeding the number of existing dwellings.

040 cap detached ADU floor area at 1,200 square feet (or 50% of the primary unit if attached), but guarantee that no standard may block an ADU of at least 16 feet in height and 800 square feet. 040(F)(2) reduces the side and rear setback to no more than four feet, and no setback at all applies when an existing structure is converted to an ADU. Parking is one space per unit or per bedroom, whichever is less, waived entirely within a half-mile of public transit, within a historic district, or when the unit is carved from existing living area.

050 are capped at 500 square feet, require owner occupancy of either unit (unless owned by a government agency, land trust, or housing organization), must be built within the walls of the existing primary unit, and require a recorded deed restriction with the County Recorder before a building permit issues. 070 allows plan check fees set by City Council resolution.