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Crawford County's primary cross-county overlay is FEMA NFIP floodplain regulation, governed by floodplain ordinances refreshed countywide on 2012-08-16 alongside revised Flood Insurance Rate Maps. There is no countywide coastal overlay (Crawford is inland; headwaters of the Sandusky River drain north toward Lake Erie), no wildland-urban-interface fire overlay, and no countywide historic-preservation overlay - the cities of Bucyrus and Galion maintain their own historic-district designations but those are municipal, not county. The county's other operationally significant cross-jurisdiction characteristics are the dual residential / commercial permit split (residential by township and/or Ohio Department of Commerce; commercial by Richland County Building Department except in Galion) and the Auditor auto-notification list described in unincorporatedPermitting, which materially changes paperwork burden depending on which jurisdiction the parcel sits in. Both are overlays in the practical sense even though neither is a zoning overlay per se.

• FEMA NFIP Special Flood Hazard Areas in Crawford County — Floodplain permit administration is handled at the local (city/village/township) level. Ohio's NFIP State Coordinator at ODNR provides backstop technical assistance.
• Auditor auto-notification jurisdictions vs. Notification Permit jurisdictions — The auto-notification list is also the most reliable public signal of which Crawford County townships maintain functional permit-issuing infrastructure (Jackson, Jefferson, Polk). Other townships rely on direct ORC enforcement and the post-hoc Auditor notification.
• Richland County Building Department commercial coverage (except City of Galion) — Strictly residential ADUs are not handled by the Richland County Building Department; this contract covers commercial scope only.

Permit responsibility in unincorporated Crawford County is split across multiple authorities, and Crawford County does NOT operate its own residential building department. (1) Township zoning permits, where required, are issued by the zoning inspector of the township the parcel sits in - applicants must contact that specific inspector directly using the Crawford County Engineer's public inspector list. (2) Ohio Building Code residential permits for single-family and accessory residential structures in unincorporated areas are not handled by a Crawford County building department; smaller jurisdictions in Ohio that do not maintain a certified residential building department default to direct application of the Residential Code of Ohio with field oversight typically coordinated through the township and the Ohio Department of Commerce Division of Industrial Compliance. Commercial construction in unincorporated Crawford County (and in every municipality except the City of Galion) is handled under contract by the Richland County Building Department in Mansfield - inspections are run on Tuesdays and Thursdays. (3) Floodplain development permits are administered locally; updated countywide floodplain ordinances were adopted in 2012 by Crawford County jurisdictions, with FEMA FIRMs revised concurrently. (4) Septic / on-site sewage approval for unincorporated parcels routes through the Crawford County Public Health Department. (5) Property-improvement notification to the County Auditor is mandatory above $2,000 - either automatically (in jurisdictions on the auto-notification list: Bucyrus, Galion, Jackson Township, Jefferson Township, Polk Township, Crestline, New Washington, North Robinson, Chatfield) or via a $5 County Auditor Notification Permit filed within 60 days of breaking ground in any other jurisdiction. Failure to notify can trigger a 50% tax penalty.