Tiny home rules in Monterey County, 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.
Monterey County recognizes a 'tiny home' as an ADU only if it qualifies as a manufactured home under Health & Safety Code section 18007. Per section 21.06.372, a qualifying tiny home is treated as a manufactured home and may serve as an ADU (max 1,200 sq ft inland). Movable tiny homes on wheels are not separately permitted as dwellings.
Monterey County's zoning code addresses tiny homes through its ADU definition. Section 21.06.372 (Dwelling unit, accessory) defines an ADU to include a manufactured home as defined in Health & Safety Code section 18007, and expressly states that the term 'manufactured home' includes 'tiny home' if the tiny home meets the requirements of section 18007. In practice this means a tiny home placed on a permanent foundation and certified as a manufactured home can be used as an ADU on a lot with a primary dwelling, subject to the same standards as other ADUs - inland maximum 1,200 sq ft (500 sq ft for a JADU), 4-foot side/rear setbacks, and Environmental Health review for water and sewage on private systems. A tiny home on wheels (THOW) that lacks manufactured-home certification is generally classified as a recreational vehicle under California law and cannot be used as a permanent residence. Monterey County has not adopted a dedicated movable-tiny-home ordinance, so RV-style tiny homes are not a recognized permanent dwelling category in the unincorporated county.
Occupying a non-certified tiny home or RV as a permanent dwelling can trigger Monterey County code enforcement. A tiny home used as an ADU still requires ministerial ADU approval and building permits, plus Environmental Health clearance where private water or septic is used.
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See how Monterey County's tiny homes rules stack up against other locations.
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