Eastvale, CA Accessory Structures: ADU Rules (2026)

010(a) states the city's intent plainly: regulate accessory dwelling units in residential zones consistent with state law to expand housing opportunities while keeping the primarily single-family character of the neighborhood. Subsection (b)(1) backs that up procedurally, requiring the community development director to approve an ADU permit application ministerially, without discretionary review, whenever the unit meets the section's objective standards, and to act within 60 days for a lot with an existing primary dwelling. On unit count, subsection (d)(1) allows one detached ADU and one attached or converted ADU per single-family lot, plus one JADU, while a multifamily lot can add up to eight detached units or convert unused space such as storage rooms and garages into attached units up to 25 percent of the existing unit count.

Size is capped at 850 square feet for a one-bedroom ADU or 1,000 square feet for a larger unit under subsection (d)(2), and height is generally limited to the primary dwelling's own height except that a detached ADU may reach 16 feet regardless, or 18 feet near a major transit stop, under subsection (d)(13). Setbacks drop to four feet from the side and rear lot lines for a new detached ADU under subsection (d)(7), and one off-street parking space is required per unit under subsection (e)(1) unless one of several exceptions, such as proximity to transit, applies.