Belmont County

Belmont County does not operate a county-administered building inspection program for residential construction. Ohio's Residential Code of Ohio (RCO) applies statewide to one- and two-family dwellings, but local enforcement is opt-in: the State of Ohio Board of Building Standards (BBS) certifies local building departments to enforce the RCO, and where no certified local department exists, residential plan review and inspection for RCO compliance are not actively enforced on a parcel-by-parcel basis for one- and two-family dwellings. Belmont County itself is not a BBS-certified residential building department; residential ADU work in unincorporated, unzoned townships proceeds through health-department on-site sewage and water review, county floodplain review (if within an SFHA), 911 addressing, and any applicable township zoning, but without a county-level building permit. Inside incorporated municipalities, the city or village handles its own permits.

Process overview: Typical workflow for an unincorporated Belmont County parcel: (1) confirm parcel is outside any incorporated municipality (St. Clairsville, Martins Ferry, Bellaire, Bridgeport, Barnesville, Bethesda, Powhatan Point, Shadyside, Holloway, Morristown, Yorkville, Brookside, Lansing); (2) confirm parcel's township and whether that township has a Chapter 519 zoning resolution — if yes, obtain a zoning compliance certificate from the township zoning inspector; (3) Belmont County Health Department review for septic (Household Sewage Treatment System) and private water-supply permits where municipal utilities are unavailable; (4) Belmont County floodplain coordinator review if parcel is in a FEMA Special Flood Hazard Area; (5) Belmont County Engineer driveway / right-of-way permit if a new access cut to a county road is needed; (6) 911 address assignment; (7) construction (residential RCO compliance is the owner's legal responsibility but is not actively inspected by a county building department); (8) county auditor parcel update at next revaluation cycle.

Impact fees: Belmont County does not levy municipal-style impact fees on residential additions in unincorporated areas. Fees are limited to per-permit fees at the health department, the engineer's office, and (where applicable) the township. Confirm current health-department HSTS permit fee schedule at intake.

Real property valuation in Belmont County is performed by the elected Belmont County Auditor (Ohio uses the title 'County Auditor' rather than 'Assessor'). Ohio counties operate a six-year reappraisal cycle with a three-year update in between (O.R.C. Sec. 5713.01 and Sec. 5715.24). An ADU added to a Belmont County parcel is captured as an improvement to the host parcel at the next sexennial reappraisal or triennial update, and may also be picked up earlier if a new building permit or visible improvement is reported. Ohio assesses real property at 35 percent of true value (O.R.C. Sec. 5715.01). Owner-occupied residential parcels qualify for the 2.5 percent owner-occupancy tax credit (O.R.C. Sec. 323.152(B)); whether that credit extends to an ADU on the same parcel depends on whether the ADU is treated as part of the principal residence or as a separately-occupied unit.

Assessment policy: Ohio assesses real property at 35 percent of true (market) value (O.R.C. Sec. 5715.01). Counties reappraise every six years with a triennial update (O.R.C. Sec. 5713.01, Sec. 5715.24). The Homestead Exemption (O.R.C. Sec. 323.152(A)) is available to owner-occupants who are 65+ or permanently and totally disabled, subject to a means test for new applicants. The 2.5 percent owner-occupancy credit (O.R.C. Sec. 323.152(B)) reduces the residential millage on the owner's principal residence. ADU treatment under the owner-occupancy credit depends on whether the Auditor classifies the ADU as part of the principal residence (one credit) or as a separate residential unit (potentially excluded from the credit on the portion attributed to the ADU).

Belmont County's two principal county-administered overlays affecting ADU feasibility are (a) FEMA NFIP Special Flood Hazard Areas along the Ohio River and its tributaries (Captina Creek, Wheeling Creek, McMahon Creek, Short Creek), administered by the Belmont County Floodplain Coordinator under the county's NFIP-participating floodplain ordinance, and (b) the legacy of long-wall coal mining and oil-and-gas development across the county, which expresses as subsidence-prone undermined ground and as Utica/Marcellus shale unitization affecting parcel-level surface use. The county itself does not maintain a historic-district overlay; municipal historic districts exist (notably parts of St. Clairsville and Martins Ferry). Wildland-urban-interface fire mapping is not maintained as a binding overlay in Ohio at the county level.

• Belmont County Floodplain Management (FEMA NFIP participation) — A new ADU in a Zone AE Ohio River SFHA parcel must be elevated to or above the Base Flood Elevation per the local floodplain ordinance and 44 CFR 60.3. Substantial-improvement triggers apply when an ADU project's cost exceeds 50 percent of the host structure's pre-improvement market value.
• Coal-mine subsidence risk (long-wall undermining) — Subsidence is not a zoning overlay in the regulatory sense — the county does not block construction — but it is a material constructability and insurance consideration that distinguishes ADU work in Belmont County from ADU work in non-mining Ohio counties.
• Utica / Marcellus shale unitization and surface-use easements — This is a parcel-level title and surface-easement issue rather than a zoning overlay; the county itself does not administer oil-and-gas operations (ODNR has sole-and-exclusive jurisdiction under O.R.C. Sec. 1509.02). It is included here because it is one of the most common Belmont-specific factors that derails an otherwise-allowed ADU.