Tiny home rules in Yuba City, CA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Yuba City has no standalone tiny-home ordinance. A permanently sited tiny home on a foundation is regulated as an Accessory Dwelling Unit under YCMC §8-5.5004 and Cal. Gov. Code §65852.2; a tiny house on wheels is regulated as a recreational vehicle/manufactured home under California Health & Safety Code Division 13.
Yuba City has not adopted a separate 'tiny home' or 'tiny house on wheels' ordinance (compare Nevada County CA, which approved THOWs as permanent housing in 2024). Tiny homes built on a permanent foundation are treated as ADUs under Yuba City Municipal Code §8-5.5004 and must comply with California Government Code §65852.2: minimum 150 sq ft floor area (the state ADU floor), maximum 800 sq ft for an attached or detached ADU, exemption from impact fees if under 750 sq ft, and standard Title 24 / California Building Code construction. Tiny houses on wheels (THOWs) are classified by the state as either recreational vehicles (under California Health & Safety Code §18010) regulated by the California Department of Housing and Community Development, or as manufactured/mobile homes if installed per HCD standards. The shed-permit exemption in YCMC §8-5.5001 does NOT cover habitable tiny homes - the 120 sq ft exemption is limited to tool sheds, storage, and playhouses, not dwelling units. Living in a non-permitted structure or RV outside an approved park is subject to Yuba City zoning enforcement.
Occupying an unpermitted tiny home as a dwelling triggers Yuba City Building Division enforcement, requires after-the-fact ADU permitting or removal, and may violate California Building Code occupancy standards. RV/THOW occupancy on a residential lot outside an approved RV park is generally prohibited under zoning; contact Development Services at (530) 822-4629.
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