Unincorporated Hardin County, Ohio does not require a county residential structural-code building permit, but township zoning certificates and Ohio's residential code can still govern a new home12. Zoning is set by individual townships, with published regulations for nine of them3. Septic permits come from the Kenton-Hardin Health Department for every address, city or not4.
At a glance
- Building permit
- No county residential structural-code permit; township zoning may still apply1
- Zoning
- Set by townships; the county lists regulations for nine named townships, and Ada and Forest villages zone themselves356
- Septic permit
- Required through the Kenton-Hardin Health Department7
- RV living
- Rules vary; Cessna requires a conditional-use permit after 30 days outside an approved RV park8
- Tiny homes
- Township rules control; Cessna applies district uses and dwelling-size minimums9
- Minimum home size
- Varies locally; Hale Township A-1 sets 800 sq ft for a house and 600 sq ft for a mobile home10
- Owner-builder
- No county-specific exemption confirmed; ask which certified building department has jurisdiction11
Who to call
Planning & zoning
Hardin County Regional Planning Commission
Countywide infrastructure planning and coordination with township zoning officers
mark.doll@hardincountyohio.gov
One Courthouse Square, Suite 130, Kenton, OH 43326
Health department
Kenton-Hardin County Health Department
Household sewage treatment system site evaluations, permits and follow-up inspections
175 W. Franklin St., Suite 120 Kenton OH 43326
Roads & driveways
Hardin County Engineer's Office
County-road driveway and right-of-way permit form, house-number requests and county road questions
hardineng@hardincountyohio.gov
1040 W. Franklin Street, Kenton, Ohio 43326
Contact details are copied from each office’s official page and were checked against it on October 14, 2026.
Off-grid gear
Going off-grid in Hardin County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Hardin County, Ohio?
Ordinary residential construction in unincorporated Hardin County does not need a county structural-code building permit, but township zoning approval can still gate a dwelling1. Ohio places detached one-, two- and three-family dwellings within the Residential Code of Ohio, enforced by the certified residential building department having jurisdiction2. We could not confirm which certified building department serves each Hardin County parcel, so ask the township zoning officer who it is before construction. We also could not confirm a county-specific owner-builder exemption; where a certified department has jurisdiction, an owner-builder must submit plans and wait for approval before covered work begins12. Inside the Village of Ada, new construction needs a village zoning certificate13. Septic approval is separate everywhere4.
Who handles Hardin County building permits and zoning?
Hardin County Regional Planning directs countywide infrastructure projects and works with township zoning officers14. Reach Regional Planning at One Courthouse Square, Suite 130, Kenton, OH 43326, by phone at (419)674-2215 or by email at mark.doll@hardincountyohio.gov14. The county publishes township regulations, but the townships administer them rather than one county zoning office3. Contact the parcel's township zoning officer for its district, allowed use, dimensional standards, zoning certificate and current fee. Buck Township leaves its zoning-certificate fee to a trustee resolution15, and Hale Township requires two scale drawings with a non-farm application, with the zoning officer acting within 30 days16. The Hardin County Engineer's Office handles house-number requests and county-road driveway permits1718.
Does Hardin County have zoning?
Hardin County has no single countywide zoning ordinance; the county page lists township regulations for Blanchard, Buck, Cessna, Dudley, Goshen, Hale, Pleasant, Taylor Creek and Jackson Townships, and does not say that list is complete19. Inside villages, Ada and Forest have their own zoning56. Blanchard, Buck, Dudley, Goshen, Hale and Taylor Creek each publish the same eight district types, from A-1 Agricultural through mobile-home park, commercial, industrial, flood plain and mineral extraction2021. Pleasant Township's resolution was amended in January 202622. Standards differ by township. Blanchard's A-1 district allows one new residential lot with at least 200 feet of road frontage and 2 acres23. Buck's A-1 sets front setbacks 100 feet from the road centerline and 40 feet at the side and rear for non-farm homes24. Cessna's A-1 requires 80 feet front and side and 40 feet rear25. Heights are generally 35 feet in Buck and Cessna's A-1, R-1 and R-2 districts, but 15 feet in Cessna's mobile-home park district26. Agricultural buildings in Cessna skip the zoning certificate but still file an application for setback and size review27.
How do septic permits work in Hardin County?
The Kenton-Hardin Health Department permits household sewage systems in Hardin County28. Start with its site and soil evaluation before fixing the house location; submit the application and $320 fee at least 48 hours before the evaluation7. Before permit issuance, provide a county-engineer address, recorded survey and an installer-prepared scaled drawing for approval4. The packet states a $424 installation permit, valid for one year or until installation and approval, and suspends installation from December 1 through March 14. An off-lot discharging system needs an Ohio EPA NPDES permit before the local sewage permit, so off-grid does not mean unpermitted sanitation28. A follow-up inspection is required within 12 months after installation29. Because 0% of mapped soils are rated free of severe limits for a conventional drain field, make septic feasibility an early purchase contingency30. Confirm current fees with the department because the cited packet was updated in 20227.
Can you live in an RV or tiny home in Hardin County?
Hardin County has no confirmed countywide private-land RV rule, so ask the parcel's township zoning officer before relying on an RV during construction. In unincorporated Cessna Township, an RV used as a residence for more than 30 days outside an approved RV park requires a conditional-use permit, renewed annually8. Cessna does not regulate "tiny homes" as a named use; a tiny home treated as a dwelling must be allowed in its district and meet the floor-area minimum31. That minimum is 800 square feet for a single-family dwelling in A-1 or R-1 and 600 square feet for a mobile-home dwelling9. Hale Township uses the same 800 and 600 square-foot minimums in A-110. Other townships may differ32.
Building a home in Hardin County: the steps, in order
- Identify the parcel's township, municipality and zoning district; ask the local zoning officer about allowed use, setbacks, height, zoning certificate and current fee32.
- Ask which certified residential building department has jurisdiction and what plan approval it requires under Ohio's residential code33.
- For a farm building, get a local determination: Ohio's exemption from the building code requires a county or township zoning inspector to issue a certificate that the structure is for agriculture34. In Cessna Township, agricultural buildings skip the zoning certificate but still need a setback-and-size application27.
- Apply to the Kenton-Hardin Health Department for the septic site and soil evaluation before fixing the house location7.
- Obtain the county-engineer address and recorded survey, then have the installer submit the scaled sewage drawing4.
- Send deeds, parcel splits, surveys and subdivision plats to the Engineer's Tax Map Department for approval when applicable35.
- Obtain the septic installation permit and any county-road driveway permit before work, then arrange the septic follow-up inspection41829.
What should you check before buying land in Hardin County?
Confirm the township, municipality and zoning district first, because Hardin County's published local rules do not establish one uniform countywide answer36. Put septic feasibility in the purchase contingency: 0% of mapped soils are rated free of severe limitations for a conventional drain field, even though 100% of county land is at a slope of 15% or less3037. Ask the health department whether a private-water-system permit is needed; its packet makes that determination conditional and lists a $392.90 permit fee when required38. Confirm county-road access with the Engineer's Office because driveway installation or work along a county road requires its permit1817. In Hale and Buck Townships, a zoning certificate must be presented before initial gas, electric, water or sewer service3940. Hale also identifies a floodplain and drainageway district, but the available excerpt does not supply the complete development specifications, so ask the township before building in mapped flood-prone land41.
Watch-outs
- A rule from one Hardin County township is not a countywide rule; verify the parcel's township, municipality and zoning district before designing the project36.
- The septic packet suspends installations from December 1 through March 1, so winter timing can delay a build7.
- A Hale Township zoning certificate becomes void if construction does not begin within 6 months16.
Sources
- Hardin County OH - Township Zoning Regulations (2026 county census)
- Ohio Building Code, Rule 4101:1-1-01, quoted and re-checked
- Prosecutor – Township Law – Hardin County Ohio, quoted and re-checked
- Process for Obtaining Sewage Treatment System Permit, quoted and re-checked
- Village of Ada: Village of Ada - Planning Commission & Zoning Ordinance (Hardin County), quoted and re-checked
- Village of Forest: Codified Ordinances of Forest, OH - Part Eleven Planning and Zoning Code, Chapter 1105 General Provisions (Hardin County), quoted and re-checked
- Process for Obtaining Sewage Treatment System Permit, quoted and re-checked
- Cessna Township Zoning Regulations, quoted and re-checked
- Cessna Township Zoning Regulations, quoted and re-checked
- Hale Township Zoning Regulations, quoted and re-checked
- Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
- Ohio Administrative Code Rule 4101:8-1-01, Residential Code of Ohio Administration, quoted and re-checked
- Village of Ada: Village of Ada - Planning Commission & Zoning Ordinance (Hardin County), quoted and re-checked
- Hardin County Regional Planning Commission (hardincountyohio.gov)
- Buck Township Zoning Regulations, quoted and re-checked
- Hale Township Zoning Regulations, quoted and re-checked
- Hardin County Engineer's Office (hardincountyohio.gov)
- Application for Permit Driveway Installation and/or Work Along Hardin County Roads, quoted and re-checked
- Prosecutor – Township Law – Hardin County Ohio, quoted and re-checked
- Blanchard Township Zoning Regulations, quoted and re-checked
- Hale Township Zoning Regulations, quoted and re-checked
- Prosecutor – Township Law – Hardin County Ohio, quoted and re-checked
- Blanchard Township Zoning Regulations, quoted and re-checked
- Buck Township Zoning Regulations, District Regulations, quoted and re-checked
- Cessna Township Zoning Regulations—Updated 2025, quoted and re-checked
- Cessna Township Zoning Regulations—Updated 2025, quoted and re-checked
- Cessna Township Zoning Regulations—Updated 2025, quoted and re-checked
- Process for Obtaining Sewage Treatment System Permit, quoted and re-checked
- Process for Obtaining Sewage Treatment System Permit, quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Cessna Township Zoning Regulations, quoted and re-checked
- Township Law, quoted and re-checked
- Section 3781.10 | Board of building standards - powers and duties, quoted and re-checked
- Section 3781.061 | Exemption for building or structure used in agriculture, quoted and re-checked
- Engineer – Tax Map and Ditch Maintenance, quoted and re-checked
- Prosecutor – Township Law – Hardin County Ohio, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Process for Obtaining Sewage Treatment System Permit, quoted and re-checked
- Hale Township Zoning Regulations, quoted and re-checked
- Buck Township Zoning Regulations, Utility Services, quoted and re-checked
- Hale Township Zoning Regulations, quoted and re-checked
Written October 14, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.