ADU rules in Eastvale, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Eastvale processes ADUs ministerially under Zoning Code Section 120.04.010 and Ordinance No. 24-07. State law (Gov. Code 66310-66342) drives the standards: detached units up to 1,200 sq ft, 16-foot height, 4-foot side/rear setbacks, and no owner-occupancy requirement through 2025.
The City of Eastvale regulates accessory dwelling units in Zoning Code Section 120.04.010, most recently amended by Ordinance No. 24-07 (adopted September 25, 2024). Because California's ADU law (Government Code 66310-66342, formerly 65852.2) strongly preempts local rules, Eastvale's standards track the state floor closely. ADUs are approved ministerially (no public hearing) within roughly 60 days of a complete application. Permitted sizes are at least 850 square feet for a studio or one-bedroom unit and 1,000 square feet for a unit with more than one bedroom, with detached and attached ADUs allowed up to 1,200 square feet; an attached ADU may not exceed 50 percent of the primary dwelling's floor area. Junior ADUs (JADUs) are capped at 500 square feet and must be within an existing or proposed single-family home. Detached ADUs may reach 16 feet (18 feet within a half-mile of transit or on multifamily lots, plus up to 2 feet for roof pitch); attached units may match the main house up to 25 feet. New construction requires a 4-foot side and rear setback, while conversions of existing legal structures need no added setback and no replacement parking. State law lets owners build at least one ADU plus one JADU per single-family lot. Note: the California Department of Housing and Community Development issued a findings letter dated February 21, 2025 concluding Ordinance No. 24-07 does not fully comply with state law (citing repealed sections), so state standards control where they conflict.
Building or occupying an ADU without ministerial permit approval, or building beyond the size/height/setback standards, can trigger code enforcement, stop-work orders, and denial of final inspection. Where Eastvale's ordinance conflicts with Government Code 66310-66342, the state standard controls per HCD's February 2025 findings letter.
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