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

At a glance

Building permit

Adams County appears not to administer a residential permit program; confirm whether another certified department has jurisdiction¹⁵

Zoning

No countywide program was confirmed; West Union has six local zoning districts and other parcel-specific rules require local confirmation⁶⁷

Septic permits

Health Department site review and an installation or alteration permit are required⁸⁹

RV or tiny-home living

Private-land occupancy remains unconfirmed; campground licensing does not answer the single-RV question¹⁰⁶

Owner-prepared plans

Ohio allows a non-architect to prepare and file plans for qualifying residential buildings¹¹

Private well

A board-of-health permit is required before constructing, altering or sealing a private water system¹²

Septic soils

Only 2.8% of county soils are rated without severe limits for a conventional drain field¹³

Who to call

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

Do you need a building permit in Adams County, Ohio?

Adams County does not appear to administer residential building permits, but we could not confirm that no certified municipal, township or contracted department covers a particular parcel¹. Ohio has separate residential and nonresidential building codes, and a department may enforce only the code types for which it is certified³. Covered residential work needs approval before it begins when a certified residential department has jurisdiction². If no certified residential department has jurisdiction, the owner need not submit residential construction documents, request inspections or obtain the residential-code certificate of occupancy¹⁴. Required residential and nonresidential work is inspected after the owner or representative tells the enforcing department it is ready¹⁵¹⁶. A nonresidential building may not be used until the building official issues a certificate of occupancy or completion¹⁷.

Who is the Adams County building department?

We could not confirm a county building department or identify the certified residential and nonresidential departments for every Adams County parcel. Start with the Adams County Commissioners at 215 North Cross Street Suite 102 in West Union and ask which certified department has jurisdiction⁴. Ohio's statewide codes do not establish that Adams County itself enforces them; enforcement by a county inspector depends on a county department certified for the relevant code¹⁸³. Ask the identified department for its application, fee schedule, project-specific inspection list and occupancy requirements before work begins. Ohio lets a non-architect prepare and file plans for a qualifying residential building, but that is not an exemption from applicable approvals or inspections¹¹. A qualifying agricultural structure may receive a building-law exemption when a county or township zoning inspector certifies its agricultural use; that does not turn a residence into an exempt farm building¹⁹.

Does Adams County have zoning?

Adams County appears not to administer countywide zoning, but we could not confirm the current rule for every township⁶. The Village of West Union has Agricultural/Institutional, Residence, Multi-Family and Mixed-Use, Central Business, Highway Business and Industrial districts; those districts apply only inside the village⁷. Ask the township or municipality governing the parcel about its district, allowed uses, setbacks, lot size, lot coverage and height before relying on land for an RV, tiny home or accessory dwelling. Permanently sited manufactured homes receive state protection in a county zone where single-family homes are allowed, subject to the same generally applicable residential zoning standards and private deed restrictions²⁰. Agricultural zoning limits are conditional, so obtain the applicable zoning determination instead of assuming every barn is exempt²¹.

How do septic permits work in Adams County?

The Adams County Health Department's Environmental Health Division handles household sewage treatment systems and private water systems²²²³. A site review comes before the application, and no new or replacement system or alteration may proceed without the board of health's permit⁹. Forms for new installations, repairs or alterations may be submitted by fax, mail or office drop-off²⁴. Plan early because only 2.8% of county soils are rated without severe limitations for a conventional drain field¹³. Published charges include a $60 operation-and-maintenance permit, a $100 septic reinspection and a $300 permit to abandon an onsite system²⁵. The board must inspect the completed system again within twelve months after installation approval²⁶.

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

We could not confirm a countywide rule for living in a single RV or tiny home on private land. Ask the parcel's township or municipality whether the unit is treated as an RV, dwelling or manufactured home and what occupancy and setback rules apply⁶. Ohio's licensed-park law permits human habitation on an RV or camping space for the term of the park's license, but it does not answer the single-RV private-land question¹⁰. Ohio's temporary park-camp limits apply to gatherings of five or more camping units, not automatically to one RV on private land²⁷. A manufactured home generally needs a state inspection seal before occupancy, while local siting rules may still apply²⁸. Any occupied unit without sanitary sewer still needs an approved sewage system²⁹.

Building a home in Adams County: the steps, in order

1. Identify the township or municipality and ask about allowed dwelling types, setbacks and parcel standards; West Union has local zoning districts, while rules elsewhere remain parcel-specific⁷⁶.

1. Ask the Adams County Commissioners which certified residential building department, if any, covers the site⁴.

1. Contact the Adams County Health Department for a septic site review before fixing the house location; most county soils carry severe conventional-drain-field limitations²²¹³.

1. Obtain the sewage-system permit and a private-water-system permit if constructing or altering a well⁹¹².

1. If a certified residential department has jurisdiction, secure approval, request the listed inspections and obtain the applicable occupancy approval before moving in²¹⁵¹⁴.

What should you check before buying land in Adams County?

Make septic feasibility the first contingency: only 2.8% of county soils are rated without severe limits for a conventional drain field¹³. Terrain can compound siting costs because 51.6% of the county is at a slope of 15% or less and 62.6% is wooded³⁰³¹. Confirm legal road access and ask the county about driveway approval because we could not confirm a countywide driveway rule. Floodplain administration and permitting apply in unincorporated Adams County, but we could not confirm the operative thresholds or application steps³². Ohio generally treats a land division as a subdivision when it creates multiple parcels and any parcel is under 5 acres, subject to statutory exemptions and the applicable planning authority³³. The Health Department lists subdivision review at $200 plus $100 per lot²⁵. The median property-tax bill is about $1,303 per year³⁴.

Watch-outs

• Do not treat the absence of a listed county building office as proof that no municipal or township building department has jurisdiction; ask the Adams County Commissioners before work begins¹⁴.
• RV use, tiny-home occupancy, setbacks and minimum lot size were not confirmed countywide; West Union has local zoning districts, and buyers elsewhere should ask the township or municipality governing the parcel⁷⁶.
• A conventional septic field may be difficult to site because only 2.8% of county soils are rated without severe limitations¹³.

Sources

1. Adams County Government - County Offices (2026 county census)
2. Residential Code of Ohio, Rule 4101:8-1-01, quoted and re-checked
3. Section 3781.10 | Board of building standards - powers and duties, quoted and re-checked
4. Adams County Commissioners (adamscountyoh.gov)
5. Section 3791.04 | Submission of plan - approvals - prohibition - fine, quoted and re-checked
6. Adams County Government - County Offices (2026 county census)
7. Zoning Ordinance of the Village of West Union, Adams County, Ohio, quoted and re-checked
8. Adams County Health Department - Septic Program (2026 county census)
9. Rule 3701-29-09 | Site review and permits for STS installation and operation, quoted and re-checked
10. Section 3729.09 | Rights coextensive with term of license, quoted and re-checked
11. Section 4703.18 | Prohibiting practice without certificate, quoted and re-checked
12. Private Water | Adams County Health Department, quoted and re-checked
13. 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
14. codes.ohio.gov, quoted and re-checked
15. Ohio Residential Code, Section 108, quoted and re-checked
16. Ohio Building Code, Section 108, quoted and re-checked
17. Ohio Building Code, Section 111, quoted and re-checked
18. Section 3781.10 | Board of building standards - powers and duties, quoted and re-checked
19. Section 3781.061 | Exemption for building or structure used in agriculture, quoted and re-checked
20. Section 303.212 | Limitations on powers - permanently sited manufactured homes, quoted and re-checked
21. Section 3781.061 | Exemption for building or structure used in agriculture, quoted and re-checked
22. Adams County Health Department, Environmental Health Division (adamscountyhealth.org)
23. Environmental Health | Adams County Health Department, quoted and re-checked
24. Septic Program, quoted and re-checked
25. Environmental Health Division Fees, quoted and re-checked
26. Rule 3701-29-09 | Site review and permits for STS installation and operation, quoted and re-checked
27. Section 3729.01 | Definitions, quoted and re-checked
28. Chapter 4781-7 | Manufactured home inspections (Ohio statewide rule), quoted and re-checked
29. Chapter 3718 - Ohio Revised Code, quoted and re-checked
30. Share of land at 15% slope or less: Bolthole Index county data
31. Wooded share of land: Bolthole Index county data
32. REQUEST FOR PROPOSALS CONTRACT FLOODPLAIN ADM SERVICES, quoted and re-checked
33. Section 711.001 | Plat definitions, quoted and re-checked
34. Median property tax bill: Bolthole Index county data

Written October 7, 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.