Carroll County

The Carroll County Auditor (Staci Brady, 119 S. Lisbon Street Suite 203, Carrollton OH 44615; 330-627-2250) maintains parcel-level valuation records for all real property in Carroll County under O.R.C. Chapter 5713. Ohio operates a six-year reappraisal cycle with a triennial update at year three (O.R.C. § 5713.01); Carroll County's most recent full reappraisal was 2025 (with notices mailed in 2024-2025), making the next triennial update due in 2028 and the next full reappraisal due in 2031. The Auditor also administers Current Agricultural Use Value (CAUV) under O.R.C. § 5713.30 — significant for Carroll County because a large fraction of the county's land area is in qualifying agricultural use under values set annually by the Ohio Tax Commissioner (the county auditor has no authority to adjust CAUV soil values). Building an ADU on a CAUV parcel does not by itself disqualify the underlying farmland, but the ADU footprint plus its yard area is removed from CAUV and reassessed at market value, and a CAUV recoupment charge may apply if the parcel ceases to qualify altogether. The Auditor also administers the Ohio Homestead Exemption (O.R.C. § 323.151), the 2.5% owner-occupancy reduction, and the manufactured-home tax program — none of which is ADU-specific but all of which interact with an ADU project at the parcel level.

Assessment policy: Carroll County is on Ohio's standard six-year reappraisal / three-year update cycle. The most recent full reappraisal took effect with tax year 2025 (notices distributed 2024-2025). New construction — including a permitted ADU — is added to the parcel record when the building official's certificate of occupancy (or equivalent improvement report) reaches the Auditor's office, typically on the next reappraisal or triennial update. CAUV parcels have the ADU footprint plus yard area split out at market value while the remaining qualifying acreage stays on CAUV; recoupment under O.R.C. § 5713.34 applies only if the parcel as a whole ceases to qualify.

Carroll County's principal overlays affecting ADU feasibility are: (1) FEMA NFIP Special Flood Hazard Areas — Carroll County participates in the National Flood Insurance Program (NFIP); the dominant flood-source watersheds are Conotton Creek (38.7-mile tributary of the Tuscarawas River draining ~286 sq mi of Carroll, Harrison, and Tuscarawas counties), Sandy Creek, Indian Fork, and the shorelines of Atwood Lake (Tuscarawas/Carroll counties) and Leesville Lake (USACE-managed reservoirs in the Muskingum Watershed Conservancy District); (2) MWCD shoreline/setback rules — both Atwood Lake and Leesville Lake are MWCD reservoirs, and parcels with lakefront frontage are subject to MWCD encroachment-permit requirements that overlay county/township rules; (3) coal-mining overlays — Carroll County sits on the Pittsburgh and other Allegheny-formation coal seams and has both historic underground and surface mining; subsidence risk in mapped undermined areas is a known constraint flagged by ODNR Division of Mineral Resources Management; (4) oil-and-gas overlay considerations — Carroll County has been one of the most heavily drilled Utica Shale counties in Ohio, with horizontal-well pad permits administered by ODNR Division of Oil and Gas Resources Management (not the county), but setback and surface-use constraints affect parcel buildability; (5) no county historic-district overlay — Carroll County does not operate a county historic-preservation commission, though individually-listed properties on the National Register exist in Carrollton and elsewhere.

• FEMA NFIP Special Flood Hazard Areas in Carroll County (Conotton Creek, Sandy Creek, Indian Fork, Atwood Lake, Leesville Lake shorelines) — Lake levels at Atwood and Leesville have repeatedly approached full outflow in wet years (recent reporting documents Carroll County flooding events tied to both reservoirs); a new ADU on a low-lying parcel near these waterbodies is a material cost-and-feasibility risk.
• Muskingum Watershed Conservancy District (MWCD) shoreline / encroachment overlay — Atwood Lake and Leesville Lake — MWCD does not preempt township zoning but adds an additional consent layer that can block or delay an ADU on a shoreline parcel.
• Historic and active coal-mining overlay (Pittsburgh and other Allegheny-formation seams) — Mandatory mine-subsidence insurance is built into homeowner policies in Carroll County; an ADU added to a covered parcel inherits the mandatory rider but the structure-specific underwriting should be confirmed with the carrier.
• Utica Shale horizontal-well pad setback considerations — Confirm any oil-and-gas surface easement at title search; this overlay does not require a county permit but materially constrains siting on affected parcels.