Washington County, AR Accessory Structures: Tiny Homes (2026)
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.
Key Facts
- Base Zoning
- One unit per acre
- Septic
- Health Dept permit required
- Second Unit
- Additional Dwelling Unit review
- On Wheels
- Treated as RV
Summary
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.
The designated zoning for the entirety of the County's parcels is “Agricultural/Single-Family Residential, one (1) unit per acre”.
Full Breakdown
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.
Violations & Fines
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.
Frequently Asked Questions
Can I put a tiny home on my land?
What about a tiny home on wheels?
Sources & Official References
Other rules in Washington County
Compare Washington County to another location·View the Arkansas accessory structures overview
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