Fulton County

Permit responsibility in unincorporated Fulton County is split across several offices. (1) Township zoning permits for residential construction (including ADUs as accessory residential structures, where the township's resolution allows them) are issued by the zoning inspector of the township the parcel sits in - applicants must contact the specific township inspector directly. Not every Fulton County township has adopted zoning; in unzoned townships there is no township zoning permit step, but state building code, FEMA floodplain regulation, and septic/well requirements still apply. (2) Residential building permits under the Ohio Residential Code (RCO) for one-, two-, and three-family dwellings in unincorporated Fulton County are administered through the Fulton County Building Inspection arrangement - the county contracts inspection services through a certified building department under ORC Chapter 3781 because Fulton County does not operate its own certified residential building department; commercial construction in unincorporated territory routes to the Ohio Department of Commerce, Division of Industrial Compliance. (3) Floodplain development permits in unincorporated areas are administered by the Fulton County floodplain administrator (housed with the Regional Planning Commission) under the county's participation in the National Flood Insurance Program. (4) On-site sewage approval is administered by the Fulton County Health Department where no public sewer is available - septic system review is one of the more time-consuming steps for an ADU added to a parcel served by an existing system because soil-suitability and reserve-area requirements may force system upgrades. (5) Driveway access permits onto county roads are issued by the Fulton County Engineer's office (151-A South Fulton Street, Wauseon). An ADU project in unincorporated Fulton County therefore typically requires: a township zoning permit (if the township is zoned), a residential building permit, a floodplain development permit if the parcel is in a FEMA SFHA along the Tiffin River, Bean Creek, or Swan Creek corridors, on-site sewage approval, and an address assignment from the county addressing authority.

Process overview: Typical Fulton County unincorporated ADU workflow: (1) Identify the township the parcel sits in (Amboy, Chesterfield, Clinton, Dover, Franklin, Fulton, German, Gorham, Pike, Royalton, Swan Creek, or York) and confirm whether that township has adopted zoning under ORC 519. (2) If zoned, contact the township zoning inspector to confirm the parcel's zoning district, whether ADUs or accessory residential structures are permitted, conditional, or prohibited, and to obtain a zoning permit. (3) Apply for a residential building permit under the Ohio Residential Code through the county's contracted certified building department. (4) Submit a floodplain development permit application to the county floodplain administrator (Regional Planning Commission) if the parcel is in a FEMA Special Flood Hazard Area along the Tiffin River (north county), Bean Creek (west county), Swan Creek (south county), or Mill Creek tributaries. (5) Apply for on-site sewage / septic approval through the Fulton County Health Department if the parcel is not on public sewer - factor in soil-evaluation and reserve-area requirements that can force an upgrade of the existing septic system. (6) Apply for a driveway access permit through the Fulton County Engineer if the parcel takes access from a county road. (7) Receive an address assignment from the county addressing authority. (8) Construct with required inspections and obtain a Certificate of Occupancy from the building official of record.

Impact fees: Fulton County itself does not levy a county impact fee on residential construction. Fees paid on an unincorporated ADU project are itemized by issuing authority: the township zoning permit fee (set by each township, typically a flat residential fee in the $25-$150 range), the Ohio Residential Code residential permit fee (set by the contracted certified building department), the county floodplain development permit fee if applicable, a county health-department septic fee (which can be substantial when a soil evaluation and reserve-area design are required), and a county engineer driveway access permit fee where applicable. Confirm all current fee schedules with each issuing office at intake.

The Fulton County Auditor is the elected county official responsible for valuing all real property in Fulton County for property-tax purposes, including new ADU improvements added to a host parcel. Fulton County follows the Ohio Department of Taxation's mandated valuation cycle: a sexennial (six-year) full reappraisal in which every parcel is physically reviewed, and a triennial (three-year) update between reappraisals that adjusts values based on local sale data. New ADU square footage and exterior changes are picked up either through the building-permit feed from the building department of record (the county's contracted certified building department for unincorporated areas, or the relevant municipal building department for parcels inside Wauseon, Archbold, Delta, Fayette, Lyons, Metamora, Pettisville, or Swanton) or through the Auditor's field-canvass during reappraisals. Ohio's owner-occupancy 2.5% reduction (ORC 323.152) and the Homestead Exemption (for qualifying senior, disabled, or surviving-spouse owner-occupants) apply to the principal residence on the parcel but do not exempt the value added by new ADU improvements. An ADU built and rented (not owner-occupied) does not by itself revoke the principal-residence owner-occupancy reduction on the rest of the parcel, but converting the principal residence itself to a rental does. Because Fulton County is heavily agricultural and a large share of parcels are enrolled in Current Agricultural Use Value (CAUV), the Auditor's office is also the practical first stop for understanding CAUV recoupment exposure when an ADU expands the residential homesite on a CAUV-enrolled parcel. Valuation disputes are heard by the Fulton County Board of Revision under ORC Chapter 5715.

Assessment policy: Sexennial full reappraisal and triennial update cycle, mandated statewide by the Ohio Department of Taxation. New ADU improvement value is added to the parcel's improvement value on the next valuation cycle following construction, picked up via building-permit data from the building department of record and through field canvass. Owner-occupancy 2.5% reduction (ORC 323.152) and Homestead Exemption attach to the principal residence on the parcel and reduce tax owed on that portion but do not exempt the added ADU improvement value. CAUV enrollment (ORC Chapter 5713) is significant in Fulton County and an ADU that enlarges the residential homesite can trigger partial CAUV removal with three-year recoupment under ORC 5713.34. Valuation challenges go to the Fulton County Board of Revision under ORC Chapter 5715.

Fulton County's operationally significant overlays cluster around (1) FEMA NFIP floodplain regulation along the county's stream corridors - the Tiffin River across the north of the county, Bean Creek and its tributaries in the west and southwest, Swan Creek through the southeast, and Mill Creek and Brush Creek tributaries that drain to the Maumee - which together create the SFHA mapping that constrains rural ADUs in roughly the lower elevations of the county; (2) Current Agricultural Use Value (CAUV) enrollment, which covers a very high share of unincorporated parcels in this predominantly agricultural Black Swamp county and creates recoupment exposure when an ADU enlarges a residential homesite on enrolled farmland; and (3) limited but real public-land constraints - Goll Woods State Nature Preserve in German Township and a portion of Maumee State Forest extending into Swan Creek Township along the southeastern county line - where adjacent private parcels combine state-land boundaries with floodplain and septic constraints. The county has no coastal overlay (it is inland), no wildland-urban-interface fire overlay, and no countywide historic-preservation overlay. The City of Wauseon and the larger villages may maintain their own local historic districts but those are municipal, not county. Unzoned townships (where they exist among Fulton County's twelve townships) function as a de facto inverse overlay in that no township zoning permit step is required, though state building code, floodplain, and septic regulation still apply. The Sauder Village complex near Archbold is a privately operated heritage site and is not a regulatory overlay.

• FEMA NFIP Special Flood Hazard Areas along the Tiffin River, Bean Creek, Swan Creek, Mill Creek, and Brush Creek corridors in Fulton County — Critical facilities must be sited outside the SFHA when feasible. Letter of Map Amendment (LOMA) and Letter of Map Revision (LOMR) processes can adjust effective mapping for parcels with verified higher ground elevations.
• Agricultural-use parcels under CAUV (Current Agricultural Use Value) — ADU applicants on CAUV-enrolled parcels should consult the County Auditor before construction to understand recoupment exposure and to verify which portion of the parcel remains in agricultural use after the ADU is added.
• Goll Woods State Nature Preserve and Maumee State Forest (Swan Creek Township edge) — Private inholdings and adjacent parcels remain subject to the underlying township zoning (where adopted), Ohio Building Code, county floodplain ordinance, and septic/well requirements.