Fort Smith, AR Accessory Structures: ADU Permits (2026)

The two-track permitting process for a Fort Smith ADU works as follows. Zoning Track: The applicant first verifies that an ADU is permitted in the underlying district under the Fort Smith UDO. If permitted by right (a so-called "as of right" use), a zoning permit issues from Development Services upon a showing of compliance with dimensional standards. If permitted by special use permit or conditional use, the application goes to the Fort Smith Planning Commission (established under A.C.A. §14-56-404) which holds a public hearing with notice. If a variance is needed, the application goes to the Board of Zoning Adjustment under A.C.A. §14-56-416(b)(2)(C)(ii). The variance standard under Arkansas law generally requires unique physical conditions, hardship not self-created, and consistency with the spirit of the ordinance. Building Track: After zoning approval, the applicant submits construction documents to the Building Official under the locally adopted IRC. Plan review confirms structural, electrical, plumbing, mechanical, and energy provisions of the IRC for one- and two-family dwellings (or IBC for townhouses or larger configurations). Inspections occur at footing, foundation, framing, rough-in, insulation, and final stages. A Certificate of Occupancy is issued before the ADU may be occupied. Fort Smith typically requires separate utility metering or affidavits for ADUs with kitchens. Properties in the FEMA Special Flood Hazard Area along the Arkansas River face additional floodplain permit review.