Tiny home rules in Twain Harte, 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.
Tuolumne County allows Accessory Dwelling Units (ADUs) under California Government Code §65852.2. Tiny homes on foundations may qualify as ADUs. Tiny homes on wheels (THOWs) are generally classified as RVs and subject to the 30-day occupancy limit for RV living.
California's ADU mandate (Government Code §65852.2) requires Tuolumne County to allow ADUs on residential lots. A tiny home on a permanent foundation that meets California Building Code can be permitted as an ADU (up to 800 sq ft detached, 4-foot side/rear setbacks, 60-day permit processing). Tiny homes on wheels (THOWs) are classified as recreational vehicles under county code and may not be used as permanent dwellings — the county restricts living in an RV to 30 days. Junior ADUs (JADUs) up to 500 sq ft within existing structures are also allowed under state law. The county cannot charge impact fees for ADUs under 750 sq ft.
Living in RV/THOW over 30 days: Code Compliance violation. Unpermitted ADU: building code violation.
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Side-by-side rule comparisons with other cities in Tuolumne County.
See how Twain Harte's tiny homes rules stack up against other locations.
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