Building permits, zoning and septic rules in Johnson County, Arkansas

Unincorporated Johnson County does not require a county residential building permit¹. The Arkansas Fire Prevention Code, including its residential volume, remains the statewide construction standard even where no local permit or inspection program exists². A permit exemption is therefore not a code exemption, and work inside a municipality may face separate city requirements². We could not confirm a residential inspection schedule or certificate-of-occupancy process for unincorporated land, so ask the county government office about those items before construction¹¹.

Johnson County lists no dedicated building, zoning or planning department¹. The general county government office in Clarksville is the starting point for questions about rural construction, county-road access, inspections or land use¹¹. Septic permitting is handled under Arkansas Department of Health authority, and the Johnson County Local Health Unit accepts local onsite-wastewater applications^5,12. Inside Clarksville, the city's Planning Commission handles zoning changes such as rezonings, so contact the city for zoning and building questions on a city lot³. Septic permits still come from the Arkansas Department of Health whether the address is inside a city or not¹².

Unincorporated Johnson County appears to have no countywide zoning¹. Inside the City of Clarksville, zoning districts do apply, and the Clarksville Planning Commission hears rezoning requests³. We could not confirm county rules for minimum dwelling size, minimum lot size, setbacks, building height or lot coverage, so ask the county government office about a specific parcel instead of treating it as unrestricted¹¹. Arkansas municipalities must allow at least one qualifying accessory dwelling unit on a parcel with a single-family home, subject to building, zoning, design, utility and sanitation requirements; that state mandate does not establish an ADU right on unincorporated Johnson County land¹⁰.

Johnson County onsite-wastewater systems are permitted under Arkansas Department of Health authority, with local applications handled through the Johnson County Local Health Unit^4,5,12. A construction permit is required before a septic system is built, altered, repaired or extended, and a system must be inspected and approved and the owner must hold a permit for operation before the system is used^6,12. Only 15.9% of Johnson County soils are rated without severe limits for a conventional drain field, so arrange the site evaluation early¹³. If public sewer is accessible within 300 feet of the building's sewer exit, connection is required instead of a new septic system¹⁴. Off-grid sanitation is not a way around wastewater rules: only Department-authorized premanufactured composting or incinerating toilets may be used, and other wastewater still requires compliant treatment or disposal⁶.

Arkansas regulates parcels with at least 3 fee-based spaces for RVs, tiny houses on wheels or mobile homes as parks, requiring Department of Health plan approval before work begins^8,15. Under that park rule, a tiny house on wheels is treated as a mobile home when plumbed and inspected under the Arkansas Plumbing Code and as an RV otherwise¹⁵. Separate state-park camping rules limit occupancy and camping units at state campsites, but they do not establish a rule for camping on private Johnson County land¹⁶. We could not confirm whether a single RV, mobile home or tiny home may be occupied long term on an unincorporated private lot, so ask the county government office before buying for that use¹¹.

1. Ask the Johnson County government office to confirm the parcel is unincorporated and whether inspections, floodplain review or county-road access approval applies¹¹.
2. Design to the statewide Arkansas Fire Prevention Code even though unincorporated Johnson County does not require a county residential building permit^1,2.
3. Arrange a septic site evaluation early because only 15.9% of county soils are rated without severe limits for a conventional drain field¹³.
4. Obtain the septic construction permit through the Johnson County Local Health Unit before system work begins^5,12.
5. Obtain an Arkansas Department of Transportation access permit before building a driveway onto a state highway⁹.
6. An owner may build the owner's own residence without a residential-contractor license, limited to 1 residence per calendar year, but this does not waive codes, permits or inspections⁷.

Soils: only 15.9% of Johnson County's soils are rated free of severe limits for a conventional septic drain field, so get a site evaluation from the Johnson County Local Health Unit before you count on a standard system^5,13. Federal land: about 48.3% of the county is federal land, mostly the Ozark-St. Francis National Forest, which limits how much private rural acreage is actually available and can affect access and neighboring land use¹³. Terrain and cover: 60.4% of the county sits at 15% slope or less, and 74.6% is wooded, so expect real clearing costs on a heavily timbered lot¹³. Access: a driveway onto a state highway needs a permit from the Arkansas Department of Transportation before any work begins, and no comprehensive county driveway rule was found, so ask the county government office directly about a driveway onto a county road^9,11. Water and sewer: if a public sewer line is within 300 feet of where your sewer would exit a building, connecting to it is required instead of installing a septic system¹⁴. Zoning and permits: because no confirmed countywide zoning ordinance or building-permit program was found, verify current rules directly with Johnson County and with any nearby city before you finalize a purchase¹. Taxes: Johnson County's effective property tax rate runs about 0.6%, with a median annual property tax bill around $706¹³. Market: the typical home value is about $189,171 and farmland runs roughly $3,931 an acre¹³.