ADU Pass
Lawrence County
ADU Pass helps homeowners in Lawrence County, Ohio navigate the permit paperwork for building an accessory dwelling unit. We cover 9 cities and 12 ZIP codes in this county.
Map
County ADU details
County ADU ordinance
Lawrence County, Ohio (southernmost Ohio along the Ohio River; ~58,240 residents per the 2020 census; county seat Ironton; 14 townships — Aid, Decatur, Elizabeth, Fayette, Hamilton, Lawrence, Mason, Perry, Rome, Symmes, Union, Upper, Washington, Windsor; one city Ironton plus six villages: Athalia, Chesapeake, Coal Grove, Hanging Rock, Proctorville, and South Point) has NOT adopted county-tier zoning under O.R.C. Chapter 303 and operates no countywide land-use ordinance regulating dwelling type or accessory dwelling units. The county DOES regulate subdivision of land under O.R.C. Chapter 711 through the Lawrence County Regional Planning Commission (administered by the Lawrence Soil and Water Conservation District at 740-867-4737), and the county operates a State-Certified County Building Department (established 2009 by the Lawrence County Commissioners) that issues building permits — but the County Building Department's certification is COMMERCIAL ONLY. The department's own page states: 'This does not include residential structures.' Residential one- and two-family dwellings (which is the category covering virtually all ADUs in this county) therefore fall to (a) township-tier zoning under O.R.C. Chapter 519 where a township has adopted a zoning resolution, (b) municipal zoning inside Ironton and the six villages, and (c) the Ohio Department of Commerce Division of Industrial Compliance (DIC) for residential plan review and inspection under the Ohio Residential Code (OAC 4101:8) in jurisdictions without a certified residential building department. ADU permissibility in unincorporated Lawrence County is therefore set parcel-by-parcel: whether the township has zoning, whether soil/slope/septic supports a second dwelling, and whether the parcel is in an Ohio River floodway or floodplain.
County assessor
Assessment policy: The Lawrence County Auditor (Paul David Knipp, 2026) is the elected property-assessment authority under O.R.C. § 5713.01. Ohio assesses real property at 35% of true value (O.R.C. § 5713.03). New ADU construction is added to the parcel record on the next regular revaluation cycle and reassessed at true value as of January 1 following completion. The Ohio Owner Occupancy Credit (O.R.C. § 323.151 et seq.) provides a 2.5% reduction in tax on owner-occupied homestead; the Homestead Exemption (O.R.C. § 323.152) reduces taxable value by $25,000 for owners 65+ or totally and permanently disabled, subject to income tests. Lawrence County also administers Current Agricultural Use Valuation (CAUV) under O.R.C. § 5713.30 - § 5713.38 — a significant program in the rural townships of the county. An ADU built on a CAUV parcel may trigger a partial recoupment (three-year rollback of the tax differential) if the dwelling and its footprint reduce qualifying agricultural acreage below the CAUV threshold. Under O.R.C. § 5713.17, the owner must notify the Auditor of any construction or improvement valued over $2,000.
County overlays (4)
Known county issues (7)
- other — Researchers should verify the township for any specific parcel before assuming ADU prohibition or permission. Parcels in unzoned townships are unusually permissive for Ohio, constrained mainly by septic, slope, and floodplain. Parcels in the few zoned townships and inside Ironton or the six villages require township- or municipal-specific review.
- other — ADU applicants must coordinate across multiple separate state and county agencies (Ohio DIC for plan review, LCHD for septic, County Engineer for driveways, township zoning where applicable, SWCD for addressing/subdivision) rather than a single one-stop county counter. Lead times are correspondingly longer; DIC inspector trip routing from Columbus or a regional office adds friction relative to counties with their own residential staff.
- other — ADU applicants must add a separate state plumbing-permit step to the workflow and budget for state plumbing inspector trip fees.
- other — ADU economics on Ohio River frontage parcels are dominated by floodplain compliance costs (elevation construction, fill, certificates, NFIP premiums where applicable) on top of normal construction cost.
- other — ADU feasibility on Wayne NF inholding parcels frequently depends on the title-recorded right-of-way to a public road; researchers should verify access before assuming an ADU can be built. Wildfire defensible-space practices add modest construction cost.
- other — ADU economics in unincorporated Lawrence County are typically dominated by septic and site-prep costs, not by permit fees or zoning. Researchers projecting ADU build cost in unincorporated Lawrence County should use a septic-cost band of $12,000-$35,000 (advanced system probable) rather than the $5,000-$10,000 conventional band typical for flatter Ohio counties.
- policy-review — Researchers should monitor the Ohio General Assembly for any future ADU preemption proposal; until one passes, Lawrence County remains in the position where unincorporated unzoned-township parcels are de facto permissive without any state preemption being needed.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.