ADU rules in Washington County, AR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
In unincorporated Washington County a second home is an Additional Dwelling Unit needing Planning review and a septic permit, since base zoning is one unit per acre. Fayetteville, by contrast, is strongly ADU-friendly.
Unincorporated Washington County zones every parcel Agricultural/Single-Family Residential, one unit per acre, so a second dwelling is an Additional Dwelling Unit that the Planning office must review even though single-family homes need no building permit. Off public sewer, the Washington County Health Department must issue an individual sewage disposal permit before the unit creates any domestic sewage. Fayetteville is the standout: its Unified Development Code allows up to two accessory dwelling units per lot, up to 1,200 square feet combined, with no added parking required and administrative approval that needs no public hearing, one of the most ADU-friendly ordinances in Arkansas.
Adding a second dwelling in the unincorporated county without Planning review, or creating sewage without the Health Department septic permit, triggers enforcement and can force removal or disconnection.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Washington County, AR
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Washington County, AR
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Washington County, AR
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Washington County, AR
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Washington County, AR
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Washington County, AR
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See how Washington County's adu rules rules stack up against other locations.
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