Fullerton, CA Accessory Structures: ADU Rental Restrictions (2026)

100(I), titled ADUs as transient lodging, states that except as provided in division (H)(3), ADUs and JADUs may not be rented for periods of less than 31 days. Division (H)(3) reinforces the same floor for ADUs approved under the state-mandated ministerial approval pathway in (H)(1), confirming that an ADU created under that subsection also cannot be rented for periods under 31 days. A related but distinct restriction applies specifically to JADUs deed-restricted under (G): that deed restriction, which must meet City Attorney approval, separately caps JADU rentals at a minimum of 30 days under (G)(2)(c).

Read together, the practical floor for any ADU or JADU in Fullerton is that it must be rented, if at all, for 30 days or more, with the general ADU/JADU rule in (I) setting 31 days as the operative minimum for units outside that specific JADU deed-restriction pathway. The restriction exists to prevent ADUs and JADUs, which are approved through a streamlined ministerial process intended to add long-term housing stock, from being converted into short-term or vacation rentals.