Hancock County

Permit responsibility in unincorporated Hancock 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 specific township the parcel sits in - applicants must contact the township inspector directly in the ten zoned townships (Amanda, Cass, Delaware, Eagle, Jackson, Liberty, Marion, Portage, Van Buren, Washington). In the seven unzoned townships (Allen, Biglick, Blanchard, Madison, Orange, Pleasant, Union) there is no township zoning permit step at all, 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 Hancock County are issued by the Hancock County Building Department, which is a certified residential building department under ORC Chapter 3781 located at the Hancock County offices in Findlay. The Hancock County BD also serves as the building department of record for several small villages (including Arlington) that do not maintain their own certified residential building department. (3) Floodplain development permits in unincorporated Hancock County are administered by the county floodplain administrator under the county's participation in the National Flood Insurance Program - the Blanchard River corridor through central Hancock County (including the Findlay urban area), Eagle Creek along the south of the county, Lye Creek, and the Riley Creek and Ottawa Creek tributaries create the most significant FEMA Special Flood Hazard Area exposure in the state outside the Lake Erie corridor. (4) On-site sewage approval is administered by the Hancock County Public Health Department where no public sewer is available; septic 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 Hancock County Engineer's office at 300 South Main Street in Findlay. (6) Subdivision and lot-split review is administered by the Hancock Regional Planning Commission for any project that depends on creating a new parcel. An ADU project in unincorporated Hancock County therefore typically requires: a township zoning permit (in a zoned township), a Hancock County BD residential building permit, a county floodplain development permit if the parcel is in a FEMA SFHA along the Blanchard River or its tributaries, on-site sewage approval, a driveway access permit if access is from a county road, and HRPC lot-split or subdivision review where applicable.

Process overview: Typical Hancock County unincorporated ADU workflow: (1) Identify the township the parcel sits in and confirm whether that township is one of the ten zoned (Amanda, Cass, Delaware, Eagle, Jackson, Liberty, Marion, Portage, Van Buren, Washington) or the seven unzoned (Allen, Biglick, Blanchard, Madison, Orange, Pleasant, Union). (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 an Ohio Residential Code residential building permit through the Hancock County Building Department in Findlay. (4) Submit a floodplain development permit application to the Hancock County floodplain administrator if the parcel is in a FEMA Special Flood Hazard Area along the Blanchard River, Eagle Creek, Lye Creek, Riley Creek, or Ottawa Creek corridors - SFHA exposure in Hancock County is unusually large because of the Blanchard River system. (5) Apply for on-site sewage approval through Hancock County Public Health if the parcel is not on public sewer, including soil evaluation and reserve-area design. (6) Apply for a driveway access permit through the Hancock County Engineer if the parcel takes access from a county road. (7) Apply for HRPC subdivision or lot-split review if the project depends on creating a new parcel. (8) Receive an address assignment from the county addressing authority. (9) Construct with required inspections and obtain a Certificate of Occupancy from the Hancock County BD.

Impact fees: Hancock County itself does not levy a county-style 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 zoned township, typically a flat residential fee in the $25-$200 range), the Hancock County BD residential plan-review-plus-permit bundle (typically $700-$1,200 for a small accessory dwelling), the county floodplain development permit fee if applicable, a Hancock County Public Health septic fee (which can be substantial when a soil evaluation and reserve-area design are required), a county engineer driveway access permit fee where applicable, and an HRPC lot-split review fee if a parcel is being created. Confirm all current fee schedules with each issuing office at intake.

The Hancock County Auditor, located at 300 South Main Street, Rooms 21 and 22, Findlay OH 45840, is the elected county official responsible for valuing all real property in Hancock County for property-tax purposes, including new ADU improvements added to a host parcel. The Auditor serves as the county's Chief Fiscal Officer, Chief Assessor, Chief Payroll Officer, and Sealer of Weights and Measures. Hancock 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. The Auditor describes a six-step valuation process (collection, analysis, setting, feedback, review, finalization). New ADU square footage and exterior changes are picked up either through the building-permit feed from the Hancock County Building Department (or the relevant municipal building department for parcels inside Findlay or one of the villages with its own BD) 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 much of unincorporated Hancock County is enrolled in Current Agricultural Use Value (CAUV) under ORC Chapter 5713, the Auditor's office is the practical first stop for understanding CAUV recoupment exposure when an ADU expands the residential homesite on a CAUV-enrolled parcel - Hancock County uses a simplified annual renewal procedure, but failure to renew triggers revaluation at market plus three-year recoupment. Valuation disputes are heard by the Hancock County Board of Revision under ORC Chapter 5715. Parcel data is accessible through the Hancock County Auditor's Beacon (Schneider Corporation) online property-search portal.

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 Hancock County Building Department or the relevant municipal BD, and through field canvass. Owner-occupancy 2.5% reduction (ORC 323.152) and the 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 unincorporated Hancock County; Hancock uses a simplified annual renewal form, and failure to renew triggers full market revaluation with recoupment of the current year and the three preceding years' tax savings. An ADU that enlarges the residential homesite on a CAUV-enrolled parcel can trigger partial CAUV removal with three-year recoupment under ORC 5713.34. Valuation challenges go to the Hancock County Board of Revision under ORC Chapter 5715.

Hancock County's operationally significant overlays cluster around (1) FEMA NFIP floodplain regulation along the Blanchard River corridor through central Hancock County (including the Findlay urban area) and along Eagle Creek, Lye Creek, Riley Creek, Ottawa Creek, and other Blanchard tributaries - the Blanchard River basin makes Hancock County one of the highest-flood-exposure interior counties in Ohio, with the 2007 Findlay flood (FEMA-1731-DR) the reference event and a multi-decade Maumee Watershed Conservancy District / City of Findlay / Hancock County / FEMA mitigation program currently in execution (FEMA approved $24M in additional mitigation funding in 2026 for Findlay-area projects); (2) Current Agricultural Use Value (CAUV) enrollment, which covers a substantial share of unincorporated parcels in this agricultural county and creates recoupment exposure when an ADU enlarges a residential homesite on enrolled farmland; (3) township-zoning patchwork itself functioning as a de facto overlay - ten Hancock townships are zoned and seven are not, which fundamentally changes the permit path on a parcel depending on which side of a township line it sits; and (4) the Hancock County Subdivision Regulations administered by HRPC, which apply countywide to land divisions. The county has no coastal overlay (it is inland), no wildland-urban-interface fire overlay, no county-wide historic-preservation overlay, and only limited public-land constraints (the Litzenberg Memorial Woods, Riverbend Recreation Area, and similar Hancock Park District holdings remove some parcels from private ADU development but are not regulatory overlays). The City of Findlay maintains its own floodplain ordinance, historic-preservation board, and zoning code; those are municipal, not county, but the county floodplain regulation aligns with the city's because both implement the same FEMA NFIP framework.

• FEMA NFIP Special Flood Hazard Areas along the Blanchard River, Eagle Creek, Lye Creek, Riley Creek, Ottawa Creek, and tributary corridors in Hancock 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; LOMRs have been frequent in Hancock County as mitigation projects come online.
• Agricultural-use parcels under CAUV (Current Agricultural Use Value) — ADU applicants on CAUV-enrolled parcels should consult the County Auditor (419-424-7820 for CAUV-specific questions) before construction to understand recoupment exposure and to verify which portion of the parcel remains in agricultural use after the ADU is added.
• Hancock County Subdivision Regulations (administered by HRPC) — HRPC also provides advisory zoning support to the townships and villages and administers grants and Community Development Block Grant programs that occasionally fund housing-related projects.