Building permits, zoning and septic rules across Ohio’s counties

At a glance

Residential building permits

15 counties: not required; 28: required in some cases; 45: required¹²³

Countywide zoning

39 counties have none; 42 have county zoning⁴⁸

No building permit and no countywide zoning

13 counties⁹

Septic permits

Local boards of health issue installation, alteration and operation permits⁶¹⁰

RV living

4 counties have an answer: 1 temporary-only, 2 limited, 1 prohibited; the other 84 are unanswered⁷

Tiny homes

2 counties have an answer, both limited; 86 are unanswered¹¹

Owner-builder

Residential plans need no architect or engineer seal; plan approval still applies where a certified department has jurisdiction¹²

Private wells

Private-water-system permits come from the local board of health¹³

Who to call

Contact details are copied from each office’s official page and were checked against it on October 13, 2026.

Which Ohio counties don’t require a building permit?

Ohio has 15 of 88 counties without a residential building-permit requirement in unincorporated areas; the county counts concern land outside city limits, where municipal rules can differ.¹ The highest-scoring counties in that group are Adams County, Monroe County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Vinton County¹. Another 28 counties require a residential building permit only in some cases, and 45 require one.²³

Statewide, an owner submits plans to the municipal, township or county building department that has jurisdiction, but where no department certified for residential buildings has jurisdiction, the owner does not have to make that submission.¹⁴ Counties may adopt and enforce local residential building regulations in unincorporated areas and may operate certified building departments.¹⁵ Use the Ohio no-building-codes list to start a shortlist, then ask the Ohio Board of Building Standards which department is certified for the address.¹¹⁶

How does building plan approval work in Ohio, and what does it cost?

Where a certified building department has jurisdiction, an owner-builder submits plans before construction and may not start until they are approved; residential plans need no architect or engineer seal.¹² Approval becomes invalid if construction has not started within 12 months, and one 12-month extension is available for a fee of no more than $100.¹² Inspections follow plan approval, at times the building official and owner agree on.¹⁷

Each certified department charges under its own locally adopted fee schedule, so ask the department for the address.¹⁸ Where plans go to the state Division of Industrial Compliance instead, the schedule includes a $275 processing fee for structural, mechanical, electrical, fire alarm and sprinkler scopes and a $65 certificate of occupancy or completion.¹⁹

Building your own home does not exempt every trade. Ohio’s contractor-licensing definitions exclude a residential building from the defined construction project, but that is not a universal owner-builder exemption, and counties may license electrical and HVAC contractors by resolution.²⁰²¹

Which Ohio counties have no zoning?

Ohio has 39 counties without countywide zoning and 42 with county zoning.⁴⁸ The highest-scoring counties without countywide zoning are Adams County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Noble County, Vinton County⁴. Ohio has 13 counties with neither a residential building-permit requirement nor countywide zoning.⁹

Use the no-countywide-zoning list and no-building-permit and no-countywide-zoning list as starting points, not as permission for a particular land use.⁴⁹ County zoning authority covers unincorporated territory only, so cities and villages set their own rules, and the county may regulate height, lot coverage and yards for nonresidential property only.²² Township zoning resolutions are a separate layer: they can regulate setbacks and height for agricultural buildings on lots over 1 acre and up to 5 acres in qualifying platted subdivisions, and the statute sets no statewide distance or height.⁵²³ Ask the township zoning office and the municipal planning office about RV occupancy, tiny-home placement and setbacks before buying.

Who issues septic permits in Ohio?

Ohio’s local boards of health approve, permit, inspect and enforce sewage-treatment-system requirements; the Ohio Department of Health supplies statewide rules and technical guidance.⁶ Across Ohio, 75 counties have a county septic authority and 13 are served by a multi-county health district.²⁴

A new, replacement or altered septic system needs a site review first, with the application and fee, a soil evaluation and a system design; the soil evaluation can be waived for small lots, alterations or incremental repairs.¹⁰ An installation or alteration permit is valid for 1 year, a site review stays valid for 5 years if site conditions and the design do not change, and a separate operation permit is required for up to 10 years.¹⁰ The board of health inspects the installation and again within 12 months of approval.²⁵

Check sewer access before designing a system: connection to a public or regional sanitary sewer is required when it is accessible and available, with a 300-foot threshold for an existing structure or a single proposed structure.²⁶ State program questions go to the Sewage Treatment Systems Program; local health districts handle permitting and can adopt stricter standards.²⁷

Can you live in an RV or tiny home on your land in Ohio?

Only 4 Ohio counties have a reviewed RV answer: Clark County allows RV occupancy as temporary emergency housing only, Carroll County and Hamilton County limit it, and Franklin County prohibits it; the other 84 have no county-level answer yet.⁷ Tiny homes have an answer in 2 counties, Clinton County and Clark County, and both are limited; 86 are unanswered.¹¹ We could not confirm a statewide tiny-home rule, so the parcel’s zoning office and certified building department decide.²⁸

Statewide rules cover other situations. Ohio’s licensed-campground rules govern RVs on licensed campground sites, not living on a private residential parcel.²⁹ Camping in state forests is prohibited outside designated areas, sites or campgrounds.³⁰ Roadside camping is limited to designated forests along division-maintained roads during legally established hunting seasons.³¹ A manufactured home generally may not be occupied until the inspector issues the inspection seal, a temporary occupancy permit may be the exception, and local ordinances can still govern placement.³²

Where are the best Ohio counties for a bolthole?

The highest Bolthole Index scores belong to Adams County, Monroe County, Morgan County, Perry County, Gallia County, Hocking County, Holmes County, Noble County³³. Adams County scores 74, Monroe County 73, Morgan County 71 and Perry County 70; Gallia, Hocking, Holmes and Noble counties each score 69.³³

Those counties all have county septic authorities; Noble County’s residential building-permit answer is limited, while the others require no residential building permit.³³ All of that group except Monroe County have no countywide zoning; Monroe County’s zoning answer is unconfirmed.³³

Ohio’s median county farmland value is $8,006 per acre; Lawrence County has the lowest listed value at $3,357 per acre.³⁴ These farmland values are context for comparison, not a vacant-parcel asking price.³⁴ The median county effective property-tax rate is 1.1%, and the median county property-tax bill is $1,856 annually; neither median is a quote for a particular parcel.³⁵

What permits do Ohio private wells need?

Ohio requires a board-of-health permit for construction, alteration or sealing of a private water system, including a well, with an exception that lets a person sealing or decommissioning a system that is not being replaced apply afterward.¹³ Applications include fees and required information, with water-sampling fees for alteration, conversion or new construction.¹³ Contact the local health district for the parcel before hiring a well contractor; the Ohio Department of Health’s Private Water Systems Program provides technical guidance and contractor registration.¹³³⁶

Ohio’s water-use framework describes domestic use as exempt from withdrawal registration, which applies above 100,000 gallons per day; that exemption does not remove the private-water-system construction permit.³⁷¹³

Can you split a parcel or build farm buildings without permits in Ohio?

Ohio’s subdivision rules apply when a division creates any parcel under 5 acres; a division into parcels of more than 5 acres is exempt when it involves no new streets or easements of access.³⁸ A plat of land outside a municipal corporation generally needs county commissioner approval before it can be recorded.³⁸ A parcel used only for agricultural or personal recreational purposes can be exempt from the local approval rules where the planning authority has adopted them, but the planning authority must first review a later change of use.³⁹

Farm buildings follow a separate path. Buildings incident to agricultural use of the land are excluded from the state building-code provisions when not used in retail trade, and a building still counts as non-retail if 50 percent or more of its sales income comes from products raised on the seller’s farms.⁴⁰ A county or township zoning inspector’s certificate declaring a specific building to be used in agriculture independently excludes it.⁴¹

Watch-outs

• Countywide zoning answers do not resolve township or municipal controls; ask the parcel’s zoning office before relying on an RV or tiny-home answer.⁷¹¹
• No residential building-permit requirement does not waive Ohio’s septic installation and operation permits or private-water-system permits.¹⁰¹³
• Some Ohio counties require a residential building permit only in particular circumstances, including floodplain development; keep that group separate from counties without a residential building-permit requirement.²
• We could not confirm the zoning answer for 7 Ohio counties, including Monroe County, Jackson County, Pike County and Jefferson County; ask each county’s planning office or township trustees.⁴²
• We could not confirm a statewide minimum dwelling size; ask the parcel’s zoning office and certified residential building department about the proposed home.²⁸
• Ohio counties can adopt local residential building regulations and enforce state codes when certified; reconfirm the address’s building department before construction.¹⁵

Sources

1. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties that do not require a residential building permit in unincorporated areas
2. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties that require a residential building permit only in some cases (for example floodplain or certain structures)
3. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties that require a residential building permit in unincorporated areas
4. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties with no county-wide zoning
5. Ohio: Section 519.21 | Powers not conferred on township zoning commission by chapter, quoted and re-checked
6. Ohio: Section 3718.023 | Approval of installation, operation or alteration of sewage treatment systems, quoted and re-checked
7. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties' answers on living in an RV on your own land
8. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties with county zoning
9. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties with neither a residential building permit nor county-wide zoning
10. Ohio: Rule 3701-29-09 | Site review and permits for STS installation and operation, quoted and re-checked
11. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties' answers on living in a tiny home on your own land
12. Ohio: Section 3791.04 | Submission of plan - approvals - prohibition - fine, quoted and re-checked
13. Ohio: Chapter 3701-28 | Private water systems, quoted and re-checked
14. Ohio: Section 3791.04 | Submission of plan - approvals - prohibition - fine, quoted and re-checked
15. Ohio: Section 307.37 | Adoption of county building code, quoted and re-checked
16. Ohio Board of Building Standards (com.ohio.gov)
17. Ohio: Rule 4101:7-3-02 | Building department personnel duties and responsibilities, quoted and re-checked
18. Ohio: Chapter 4101:7-7 | Fees, quoted and re-checked
19. Ohio: Chapter 4101:7-7 | Fees, quoted and re-checked
20. Ohio: Section 4740.01 - Ohio Revised Code | Ohio Laws, quoted and re-checked
21. Ohio: Section 3781.102 | Extending building department certifications, quoted and re-checked
22. Ohio: Section 303.02 | County commissioners may regulate building and land use in unincorporated territory, quoted and re-checked
23. Ohio: Section 519.21 | Powers not conferred on township zoning commission by chapter, quoted and re-checked
24. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Who issues septic permits across Ohio's counties: a state agency, a multi-county health district, or the county
25. Ohio: Rule 3701-29-09 | Site review and permits for STS installation and operation, quoted and re-checked
26. Ohio: Rule 3745-42-07 | Best available technology for connection into sanitary sewers and centralized collection and treatment, quoted and re-checked
27. Ohio Department of Health — Sewage Treatment Systems Program (odh.ohio.gov)
28. Ohio: Section 3781.10 | Board of building standards - powers and duties, quoted and re-checked
29. Ohio: Rule 3701-26-04 | Campground requirements, quoted and re-checked
30. Ohio: Rule 1501:3-3-01 | Camping permitted in designated areas, quoted and re-checked
31. Ohio: Rule 1501:3-3-06 | Camp occupancy, quoted and re-checked
32. Ohio: Chapter 4781-7 | Manufactured home inspections, quoted and re-checked
33. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: The 8 highest-scoring Ohio counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
34. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Median farmland value per acre across Ohio's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
35. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Median of Ohio's county effective property tax rates and median county property tax bills
36. Ohio Department of Health — Private Water Systems Program (odh.ohio.gov)
37. Ohio water rights and groundwater management: National Agricultural Law Center and Bolthole Index groundwater review
38. Ohio: Section 711.001 | Plat definitions, quoted and re-checked
39. Ohio: Section 711.133 | Procedure for approval of qualifying division without plat, quoted and re-checked
40. Ohio: Section 3781.06 | Public buildings to be safe and sanitary - definitions, quoted and re-checked
41. Ohio: Section 3781.06 | Public buildings to be safe and sanitary - definitions, quoted and re-checked
42. Bolthole Index county rulebook, 88 Ohio counties, as of October 10, 2026: Ohio counties whose building-permit or zoning answer we could not confirm

Written October 13, 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.