Tiny home rules in Washington County, AR — 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 foundation tiny home is allowed on its own acre in unincorporated Washington County under the one-unit-per-acre zoning, needing a septic permit but no building inspection. On wheels, it is treated as an RV.
Washington County zones every parcel Agricultural/Single-Family Residential, one unit per acre, and enforces no building code for single-family homes, so a foundation-built tiny house on its own qualifying tract needs no building permit or inspection, only a Washington County Health Department septic permit before it creates sewage. A second tiny home on the same tract is an Additional Dwelling Unit requiring Planning review. A tiny house on wheels is treated as a recreational vehicle, not a permanent dwelling. Inside Fayetteville, a small tiny home can instead qualify as an accessory dwelling unit under the city's ADU-friendly UDC.
Placing a second dwelling on a tract without Additional Dwelling Unit review, or occupying any tiny home without the Health Department septic permit, triggers county enforcement.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Washington County's tiny homes rules stack up against other locations.
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