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

Unincorporated Washington County does not require a traditional building permit for a single-family home or personal accessory building¹. The county Planning page also says it does not require building inspections for agricultural buildings, single-family homes or residential accessory structures, and a certificate of occupancy is issued only when requested⁵.

That answer covers unincorporated land only. Inside Prairie Grove, Johnson and Greenland, the city issues its own building permits: Prairie Grove⁶, Johnson⁷ and Greenland⁸. We could not confirm who issues building permits in Fayetteville, Springdale or Farmington, so ask the city before you build there.

No traditional building permit does not mean no standards or approvals. Arkansas construction standards apply statewide even where no permit is required⁹. Zoning, subdivision, septic and access rules can independently require review before work begins^2,3,4, and building in a FEMA-identified flood hazard area needs a floodplain permit³.

Washington County Planning is the first stop for an unincorporated parcel: the office handles zoning and development applications, lot splits, floodplain permits and address applications⁵. The office is at 2615 S. Brink Drive, Fayetteville, AR 72701; call (479) 444-1724 or email planning@washingtoncountyar.gov⁵. Planning accepts project fees in person or by mail when an application is submitted⁵. The county identifies Planning as its floodplain administration office, with added permits and restrictions in Floodzone A or AE¹.

For onsite wastewater questions, call the Washington County Health Department at 479-521-8181 ext. 2115; the county directs owners to local Designated Representatives for soil work and existing-system inspections¹. The Arkansas Department of Health or its Authorized Agent approves onsite wastewater plans and permits, for every address in the county, city or not⁴. For a culvert serving a driveway, contact the Washington County Road Department at 479-444-1610⁵.

Washington County has adopted a zoning act and zoning map for its unincorporated area². Unlike the counties around it in Arkansas, Washington County has county zoning¹. Inside the cities, Fayetteville¹⁰, Springdale¹¹, Farmington¹², Prairie Grove¹³ and Johnson¹⁴ each set their own zoning, so establish jurisdiction before relying on the county answer.

In unincorporated Washington County, residential subdivision lots must contain at least 1 acre excluding access easements, and septic or well suitability may require more². Buildings on parcels smaller than 20 acres must stay 25 feet from a street right-of-way, 10 feet from side property lines and 20 feet from the rear line². On a land-division survey, the 25-foot front setback must also be dedicated as a utility easement¹⁵. Plot distances from verified boundaries and the actual right-of-way, not the pavement edge.

Larger projects get more review. A parcel over 1 acre developed as a single improvement counts as a large-scale development, which is not defined to include a single-family residence or a farm or other agricultural facility¹⁶. County Planning checks the zoning first, and a Conditional Use Permit may be required¹⁶.

An onsite wastewater (septic) permit must be obtained before a system is constructed, installed or modified in Washington County⁴. The Arkansas Department of Health governs the system, while delegated work may run through an Authorized Agent⁴. Call the Washington County Health Department at 479-521-8181 ext. 2115 for the local route and a Designated Representative¹.

The system cannot begin operating until it has been inspected and approved and the owner has a Permit for Operation⁴. Only about 8.6% of Washington County soils avoid a USDA rating of “very limited” for a conventional septic drain field, so a site evaluation can materially change the usable house site and budget¹⁷. Septic rules do not move to the cities: the health unit in the county where the property sits handles onsite wastewater questions inside Fayetteville too¹⁸. A sanitary-sewer connection is required when sewer is within 300 feet of the building's sewer-exit point and can be reached without crossing another person's property⁴.

We could not confirm a complete Washington County rule allowing or prohibiting long-term RV living, temporary camping or a single tiny home on private land. Because unincorporated parcels remain subject to zoning, residence-count and land-use restrictions, ask Washington County Planning about the exact parcel and intended occupancy before buying or moving a unit onsite^1,5.

Arkansas's health rules do answer a narrower question: a parcel with 3 or more paid spaces intended for recreational vehicles, tiny houses on wheels or mobile homes is treated as a regulated park when placement or maintenance services are provided for a fee¹⁹. Under those park rules, a tiny house on wheels is treated as a mobile home if plumbed and inspected under the Arkansas Plumbing Code, and as a recreational vehicle if it is not²⁰. Those park provisions do not decide whether one RV or tiny home may be occupied on a private parcel¹⁹.

1. Confirm that the parcel is outside city limits, then ask Washington County Planning to check the zoning map and proposed use².
2. Check the survey, setbacks and any proposed property split before fixing the house location^2,3. A subdivision runs through pre-platting, preliminary review, technical review, Planning Board review, final review and final-plat filing³.
3. For a development large enough to count as large-scale, budget for plat review fees of $100 for a concept plat, $500 for a preliminary or final plan, and $750 for a high-intensity plan¹⁶. Adjoining owners within 300 feet get a certified letter at least 14 days before the Planning Board meeting¹⁶.
4. Check for a FEMA-identified Special Flood Hazard Area and obtain the required floodplain permit before development there³.
5. Arrange the septic site work and obtain Arkansas Department of Health or Authorized Agent approval before onsite wastewater construction⁴.
6. Confirm legal access and ask the Road Department whether the driveway needs a culvert permit^3,5.
7. Build to applicable Arkansas standards even though the county does not require the traditional residential building permit^1,9.
8. Obtain septic inspection and the Permit for Operation before using the system⁴.

Start with wastewater feasibility: only about 8.6% of Washington County soils avoid a “very limited” rating for conventional drain fields¹⁷. About 61.8% of the land has a slope of 15% or less, while about 56.8% is wooded, so the specific homesite and access route matter more than a parcel-wide average¹⁷. Verify floodplain status with Planning because development in a FEMA-identified Special Flood Hazard Area requires a county floodplain permit³.

Confirm legal road access and ask the Road Department whether a culvert permit is required⁵. If a sanitary sewer is available within 300 feet under the state's access conditions, connection is required rather than a private onsite system⁴. For carrying costs, the effective property-tax rate is about 0.6%, the median annual property-tax bill is about $1,465, and the typical home value is about $356,013¹⁷.