Building permits, zoning and land rules in Clinton County, Ohio

Yes. Clinton County requires a building permit for new structures, additions, structural changes, decks, electrical installations, pools, remodels and signs in its townships; the examples are not exhaustive². Inside Wilmington, the city handles building permits; residential septic permits and inspections still come from the Clinton County Health District^3,5. Clinton County enforces Ohio building, residential, mechanical, plumbing, fire, energy, accessibility and electrical codes for covered projects¹¹. New residential buildings and regulated alterations or additions may not be occupied until the residential building official issues a certificate of occupancy or completion⁹. In the county agricultural districts, the confirmed agricultural-building exemption covers height and impervious-coverage standards; ask Building & Zoning about building-permit requirements for the proposed farm structure^2,7.

The Clinton County Building & Zoning Department handles county building and zoning applications, fees, permit status and inspection scheduling². Apply through the Permit Portal or submit the county's PDF application by email or drop-off; call 937-382-3335 or email buildingandzoning@clintoncountyohio.us^2,12. Submit building plans, a site plan, owner and parcel information, and septic approval when applicable². For projects handled by the county, building inspections are scheduled by phone, the county requests 24–48 hours of notice, and a permit closes after the final approved inspection^1,2. Clinton County publishes a building and zoning fee schedule effective May 2025; new structures require a processing fee with the application, full payment is due after approval, and credit payments carry a 3.5% processing fee¹³. An owner-builder may submit plans for a residential building without an architect or engineer seal, but must obtain plan approval before starting; ask Building & Zoning which trade licenses or affidavits apply^2,10.

Clinton County zoning governs unincorporated land in every township except Clark and Washington; incorporated cities and villages are outside the county resolution^2,7. Wilmington and the Village of Blanchester have their own zoning; residential septic permits and inspections remain with the Clinton County Health District^4,5,14. The county publishes zoning regulations and an official map for the townships it zones, so verify the parcel's district before relying on dimensional standards^15,16. In the A-2 General Agriculture District, a single-family dwelling needs at least 864 square feet of habitable area⁷. An A-2 lot generally needs at least 10 acres and 150 feet of frontage on a qualifying road⁷. A-2 primary structures have 30-foot side and rear setbacks, plus a front setback of 105 feet from the pavement centerline or 70 feet from the thoroughfare-plan right-of-way⁷. Clark and Washington remain subject to building permits and countywide Health District septic permits even without county zoning^2,5.

Ohio sets the sewage-treatment framework, and the Clinton County Health District permits, inspects and enforces installation and alteration of residential systems throughout the county, including addresses inside incorporated places⁵. Only a registered sewage-treatment-system installer or contractor may purchase the septic installation permit, and the application and payment must arrive before the property evaluation⁶. The published county schedule lists $300 for a new or replacement household system permit, $260 for a septic alteration permit and $65 for a return inspection⁵. The Health District can design a system tailored to the home⁵. Ohio's site-review process includes the application and fee, soil evaluation and system design; an installation or alteration permit is valid for 1 year and may receive an extension¹⁷. Only 1.6% of Clinton County soils are rated without severe limitations for a conventional drain field, so establish septic feasibility before fixing the house location¹⁸. A qualifying available public sewer can trigger a connection requirement instead of onsite disposal; Clinton County publishes sewer-tap applications for Martinsville and Midland but does not state a general countywide connection rule^12,19.

In areas governed by the Clinton County zoning resolution, a cabin, trailer, motor home, mobile home, vehicle or other temporary structure generally cannot be used as a dwelling for longer than 90 days unless another provision permits it⁷. A tiny home treated as one of those temporary dwellings is subject to the same limit; the resolution does not classify every tiny home that way, so ask Building & Zoning how it will classify the proposed unit^2,7. A separate rule limits recreational-vehicle occupancy in a campground or RV park to 6 months per calendar year, and limits tents or other temporary campground structures to 30 days per calendar year⁷. The campground occupancy limits apply to campgrounds and RV parks; an ordinary private parcel must be evaluated under the temporary-dwelling rule⁷. A permanent tiny home must still fit the parcel's zoning district; for example, an A-2 single-family dwelling needs at least 864 square feet of habitable area⁷. Manufactured homes are barred from a campground except as an owner-occupied office or residence, while occupancy elsewhere still depends on the applicable siting and approval rules⁷.

1. Identify the township; where county zoning applies, confirm the parcel district, proposed use and site layout with Building & Zoning^2,16.

1. Resolve access before construction; a new driveway along a county or township road needs an access permit and a safety review by the Engineer's Office²⁰.

1. Arrange the septic application, soil evaluation and system design before fixing the house footprint^5,17.

1. Have a registered private-water contractor obtain the well permit, then complete the required water test and final inspection⁸.

1. Obtain zoning approval first where required, then submit building plans, a site plan and applicable septic approval through the portal or by PDF^1,12.

1. Wait for required plan approval before beginning regulated work¹⁰.

1. Have a registered installer or contractor buy the septic installation permit⁵.

1. Schedule building inspections by phone with 24–48 hours of notice, and obtain the required occupancy certificate before moving into the regulated residence^2,9.

Start with septic suitability: only 1.6% of Clinton County soils are rated without severe limitations for a conventional drain field, making an early soil evaluation more useful than a seller's guess¹⁸. A new private well requires a county permit pulled by a registered private-water contractor, followed by a water test and final inspection⁸. Confirm road jurisdiction and driveway placement because a new driveway along a county or township road needs an access permit; culvert approval comes from either the Engineer's Office or township trustees, depending on the township²⁰. Check the official zoning map rather than relying on a listing, because the map controls the current district⁷. We could not confirm the current floodplain-development permit trigger, so ask the Engineer's Office about flood-hazard review before closing²⁰. The published subdivision regulations cover division and development of unincorporated Clinton County land and give the Regional Planning Commission final plat and subdivision approval; ask the Commission for current lot-split requirements because the document dates to 2006 and leaves adoption and amendment dates blank^15,21. New parcels must be recorded with the Map Office, and the Health District schedule lists a $100-per-lot lot-split or subdivision-review fee¹⁵. The effective property-tax rate is about 0.9%, and the median property-tax bill is about $1,816 per year¹⁸.