ADU rules in Hemet, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Hemet's zoning code (Sec. 90-321) allows detached ADUs up to 1,200 sq ft and attached ADUs up to 50% of the primary home, with 4-foot side/rear setbacks. The city's 2018 ordinance predates many state changes, so current California ADU Law (Gov. Code 66310+) governs where it conflicts.
Hemet regulates accessory dwelling units under Chapter 90, Sec. 90-321 of its zoning code. A detached ADU may not exceed 1,200 square feet of floor space, and an attached ADU is limited to 50% of the floor area of the existing primary dwelling. For an ADU that is not converted from an existing structure, the code requires a setback of no more than four feet from the side and rear lot lines. The local ordinance text states one parking space shall be provided in addition to spaces for the principal dwelling, and that no replacement off-street parking is required when a garage or carport is demolished or converted for an ADU.
Important: In an October 8, 2025 Letter of Technical Assistance, the California Department of Housing and Community Development (HCD) notified Hemet that its most recent ADU ordinance on file dates to 2018 and may be outdated and out of compliance with current State ADU Law. Under Gov. Code 66316, a non-compliant local ADU ordinance is 'null and void,' and the city must apply state standards until it adopts a compliant ordinance. State law now bars owner-occupancy requirements on ADUs, prohibits parking conditions for JADUs, and forbids minimum-lot-size rules, among other changes. Property owners should confirm current standards with the Hemet Planning Division (951-765-2375).
Building or occupying an ADU without ministerial permit approval, or applying outdated local standards that conflict with State ADU Law, can lead to permit denial, code enforcement action, or required corrections.
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Side-by-side rule comparisons with other cities in Riverside County.
See how other cities in Riverside County handle adu rules.
See how Hemet's adu rules rules stack up against other locations.
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