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

At a glance

Building permit

Required when building in any Clinton County township¹

Zoning

County zoning excludes Clark and Washington Townships and incorporated places⁷²

Septic

County Health District permit; a registered installer or contractor must buy it⁵⁸

Temporary dwelling

Generally limited to 90 days where the county zoning resolution applies⁹

A-2 home size

At least 864 square feet of habitable area for a single-family dwelling¹⁰

Private well

County permit, water test and final inspection required¹¹

Occupancy

Certificate required before a regulated new or altered residence is occupied¹²

Owner-builder plans

An owner may submit residential plans, but approval is still required before work¹³

Who to call

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit 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 exhaustive¹⁴. Inside Wilmington, the city handles building permits; residential septic permits and inspections still come from the Clinton County Health District³⁵⁶. Clinton County enforces Ohio building, residential, mechanical, plumbing, fire, energy, accessibility and electrical codes for covered projects¹⁵. New residential buildings and regulated alterations or additions may not be occupied until the residential building official issues a certificate of occupancy or completion¹². 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 structure¹⁶¹⁷.

Who issues Clinton County building permits, and how do you reach them?

The Clinton County Building & Zoning Department handles county building and zoning applications, fees, permit status and inspection scheduling¹⁷. 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.us¹⁸¹⁷. Submit building plans, a site plan, owner and parcel information, and septic approval when applicable¹⁹. 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 inspection²⁰¹⁷. 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 fee²¹. 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 apply¹³¹⁷.

Does Clinton County, Ohio have zoning?

Clinton County zoning governs unincorporated land in every township except Clark and Washington; incorporated cities and villages are outside the county resolution²²². Wilmington and the Village of Blanchester have their own zoning; residential septic permits and inspections remain with the Clinton County Health District⁴²³⁵⁶. The county publishes zoning regulations and an official map for the townships it zones, so verify the parcel's district before relying on dimensional standards²⁴²⁵. In the A-2 General Agriculture District, a single-family dwelling needs at least 864 square feet of habitable area¹⁰. An A-2 lot generally needs at least 10 acres and 150 feet of frontage on a qualifying road²⁶. 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-way²⁷. Clark and Washington remain subject to building permits and countywide Health District septic permits even without county zoning²⁸²⁹.

How do septic permits work in Clinton County?

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 places³⁰⁶. 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 evaluation⁸. 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 inspection³¹³². The Health District can design a system tailored to the home³³. 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 extension³⁴. 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 location³⁵. 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 rule³⁶³⁷.

Can you live in an RV or tiny home in Clinton County, Ohio?

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 it⁹. 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 unit³⁸¹⁷. 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 year³⁹⁴⁰. The campground occupancy limits apply to campgrounds and RV parks; an ordinary private parcel must be evaluated under the temporary-dwelling rule³⁹⁹. 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 area¹⁰. 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 rules⁴¹.

Building a home in Clinton County: the steps in order

1. Identify the township; where county zoning applies, confirm the parcel district, proposed use and site layout with Building & Zoning⁴²²⁵¹⁷.

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 Office⁴³⁴⁴.

1. Arrange the septic application, soil evaluation and system design before fixing the house footprint³⁴³³.

1. Have a registered private-water contractor obtain the well permit, then complete the required water test and final inspection¹¹.

1. Obtain zoning approval first where required, then submit building plans, a site plan and applicable septic approval through the portal or by PDF¹¹⁸.

1. Wait for required plan approval before beginning regulated work⁴⁵.

1. Have a registered installer or contractor buy the septic installation permit⁴⁶.

1. Schedule building inspections by phone with 24–48 hours of notice, and obtain the required occupancy certificate before moving into the regulated residence⁴⁷¹².

What should you check before buying land in Clinton County?

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 guess³⁵. A new private well requires a county permit pulled by a registered private-water contractor, followed by a water test and final inspection⁴⁸. 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 township⁴⁹. Check the official zoning map rather than relying on a listing, because the map controls the current district⁵⁰. We could not confirm the current floodplain-development permit trigger, so ask the Engineer's Office about flood-hazard review before closing⁴⁴. 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 blank⁵¹⁵². New parcels must be recorded with the Map Office, and the Health District schedule lists a $100-per-lot lot-split or subdivision-review fee⁵³. The effective property-tax rate is about 0.9%, and the median property-tax bill is about $1,816 per year⁵⁴⁵⁵.

Watch-outs

• A new driveway on a county or township road needs an access permit before construction; the typical residential access-permit fee is $20⁴⁹.
• Only a registered sewage-treatment-system installer or contractor may purchase Clinton County's septic installation permit⁴⁶.
• The 90-day temporary-dwelling limit is not the same as the 6-month campground RV limit; ask Building & Zoning which provision applies to the parcel and proposed use⁹³⁹¹⁷.

Sources

1. Building in Clinton County, quoted and re-checked
2. Building in Clinton County, quoted and re-checked
3. Wilmington: Permit required (Clinton County), quoted and re-checked
4. Wilmington: Residential Districts—General provisions (Clinton County), quoted and re-checked
5. Sewage Treatment Systems, quoted and re-checked
6. Sewage Treatment Systems, quoted and re-checked
7. Building in Clinton County, quoted and re-checked
8. Sewage Treatment Systems, quoted and re-checked
9. Clinton County Zoning Resolution 2025, quoted and re-checked
10. Clinton County Zoning Resolution, quoted and re-checked
11. Private Water Systems, quoted and re-checked
12. Ohio Residential Code Rule 4101:8-1-01, quoted and re-checked
13. Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
14. Building in Clinton County, quoted and re-checked
15. Building Codes, quoted and re-checked
16. Clinton County Zoning Resolution 2025, quoted and re-checked
17. Clinton County Building & Zoning Department (co.clinton.oh.us)
18. Applications, quoted and re-checked
19. Building in Clinton County, quoted and re-checked
20. Building in Clinton County, quoted and re-checked
21. Clinton County Building and Zoning Fee Schedule, quoted and re-checked
22. Building in Clinton County, quoted and re-checked
23. Village of Blanchester: Chapter 154: Zoning Code (Clinton County), quoted and re-checked
24. Regulations, quoted and re-checked
25. Zoning Links, quoted and re-checked
26. Clinton County Zoning Resolution, quoted and re-checked
27. Clinton County Zoning Resolution, quoted and re-checked
28. FAQ - Building & Zoning, quoted and re-checked
29. Sewage Treatment Systems, quoted and re-checked
30. Sewage Treatment Systems, quoted and re-checked
31. Sewage Treatment Systems, quoted and re-checked
32. Sewage Treatment Systems, quoted and re-checked
33. Clinton County Health District, Sewage Treatment Systems (co.clinton.oh.us)
34. Rule 3701-29-09 | Site review and permits for STS installation and operation (Ohio statewide rule), quoted and re-checked
35. 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
36. Rule 3745-42-07 | Best available technology for connection into sanitary sewers and centralized collection and treatment (Ohio statewide rule), quoted and re-checked
37. Applications, quoted and re-checked
38. Clinton County Zoning Resolution, quoted and re-checked
39. Clinton County Zoning Resolution, quoted and re-checked
40. Clinton County Zoning Resolution, quoted and re-checked
41. Clinton County Zoning Resolution, quoted and re-checked
42. Building in Clinton County, quoted and re-checked
43. Permits, quoted and re-checked
44. Clinton County Engineer's Office (co.clinton.oh.us)
45. Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
46. Sewage Treatment Systems, quoted and re-checked
47. Building in Clinton County, quoted and re-checked
48. Private Water Systems, quoted and re-checked
49. Permits, quoted and re-checked
50. Clinton County Zoning Resolution, quoted and re-checked
51. Subdivision Regulations for Clinton County, Ohio – 072006 Edition, quoted and re-checked
52. Regulations, quoted and re-checked
53. Regulations, quoted and re-checked
54. Effective property tax rate: Bolthole Index county data
55. Median property tax bill: Bolthole Index county data

Written October 11, 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.