Tiny home rules in Williamson County, TN — 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.
A tiny home's status in unincorporated Williamson County turns on its foundation. On a permanent foundation it is a dwelling under the adopted residential code; on wheels it is a titled RV that zoning does not treat as a permanent home.
A tiny house on a permanent foundation is a dwelling in unincorporated Williamson County and must meet the adopted International Residential Code for room sizes, ceiling height, egress, and smoke and carbon-monoxide alarms, with a building permit before work begins and Sewage Disposal Management approval for septic. Whether it can sit as a second unit is set by the Zoning Ordinance, since Tennessee has no statewide ADU mandate. A tiny house on wheels is titled and registered as a recreational vehicle, not a permanent dwelling, and county zoning restricts living full time in an RV on a residential lot.
Placing a foundation-built tiny home without a permit is unlawful work. Living full time in a titled RV or travel trailer parked on a residential lot conflicts with the Zoning Ordinance and draws enforcement.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Williamson County's tiny homes rules stack up against other locations.
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