Building permits, zoning and septic rules in Greene County, Ohio

At a glance

Building permit

Required for construction under Greene County Building Regulation jurisdiction¹

Zoning

No countywide ordinance; township and municipal rules vary²³

Septic permit

Required for new or replacement systems and alterations; Greene County Public Health administers the program⁴⁵

Owner-builder

An owner may direct a home build for personal use, but permits and code compliance still apply⁶

RV or tiny home

Ask the parcel's township zoning inspector; no countywide zoning does not establish permission to occupy²³⁷

Septic soils

0% of soils are rated free of severe limits for a conventional drain field⁸

Major subdivision

County review applies outside municipalities⁹

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 Greene County, Ohio?

Yes. Construction under Greene County Building Regulation jurisdiction requires a permit, and zoning approval must come first when the project needs it.¹ Residential work served by the county uses the Residential Code of Ohio for one-, two-, and three-family dwellings and their accessory structures.¹⁰ Greene County serves most of the county, but Fairborn, Xenia, Bowersville, Clifton, Cedarville, Yellow Springs, and state or federal properties are outside the county office's stated service area.¹¹ An owner may prepare residential plans and supervise construction for the owner's own use, but the owner must still submit plans, obtain applicable approval, and comply with permits and codes.⁶ Agricultural buildings may qualify for a conditional state-code exemption, with an additional exemption available through an agricultural-use certificate from the township zoning inspector.¹²

How do you apply for Greene County building permits, and what are the fees?

The Greene County Department of Building Regulation is at 667 Dayton-Xenia Rd., Xenia, OH 45385, phone (937) 562-7420.¹¹ Applications and plans are electronic only through iWorQ; applicable fees must be paid before review, and required local zoning approval must precede building-permit issuance.¹³¹⁴ Building fees vary by permit type, area, valuation and inspection circumstances; the published schedule lists $500 for starting work without a permit and $150 for a residential floodplain permit.¹⁵ Fees become nonrefundable once processing starts, and an application unpaid for more than 60 calendar days is abandoned.¹³ Inspections may be scheduled through iWorQ or by telephone by 3 p.m. on the workday before the requested date.¹³ The existing-commercial-building certificate-of-occupancy process requires an established occupancy, no pending violations or orders, and zoning approval; changes of use, alterations or additions need a different approval process.¹⁶

Does Greene County have zoning?

Greene County does not administer a countywide zoning ordinance; unincorporated parcels fall under township zoning rather than county zoning.²³ All 12 townships and every municipality except Bowersville have adopted zoning regulations administered locally.³ Dayton, a city mainly in Montgomery County that reaches into Greene County, has its own zoning districts and overlays inside city limits.¹⁷ Septic administration for Greene County addresses remains with Greene County Public Health.⁴ Ask the applicable local zoning inspector for the parcel’s district, permitted uses, minimum lot and dwelling sizes, setbacks, height and lot coverage before treating the parcel as buildable.⁷¹⁸

How do septic permits work in Greene County?

Greene County Public Health’s Environmental Health Division handles private sewage-system design review, permits, inspections and operational permits countywide.⁴ New or replacement systems and alterations require an installation or alteration permit, an approved site review and a registered installer.⁵ The approved permit lasts 1 year from issuance, with a possible extension by the health board.⁵ Abandonments also require a permit, and fees include the base permit fee plus known required reinspections; correcting an incomplete or disapproved gravity-flow installation carries a $150 reinspection fee.¹⁹ Greene County inspects all installations and existing systems when requested or required; mound systems need a scratch test, uncovered mound and pump test, and final grade inspection.²⁰ With 0% of Greene County soils rated free of severe limitations for conventional drain fields, make the site evaluation an early purchase contingency.⁸

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

The absence of countywide zoning does not establish permission to live in an RV or tiny home in unincorporated Greene County: all townships have their own zoning.²³ Ask the parcel’s township zoning inspector whether full-time occupancy or temporary occupancy during construction is allowed and which local approvals apply.⁷ Building approval and septic requirements remain separate from zoning approval.¹⁵ A manufactured home generally cannot be occupied until the inspector issues its inspection seal, unless a temporary-occupancy exception applies.²¹

What are the steps to building a home in Greene County?

1. Identify the parcel's township, city, or village, confirm the zoning district, and obtain required local zoning approval.³⁷
2. Ask Greene County Public Health whether sanitary sewer is available; private septic systems serve qualifying homes where sewer connection is not possible.²²
3. If septic is needed, complete the site review, obtain the installation permit and arrange a registered installer before work begins.⁵
4. If a private well is planned, ask Greene County Public Health which installation, alteration, or abandonment permit applies; the county page does not say that every well-related activity requires one.²³
5. Apply electronically to the building department with jurisdiction, pay applicable fees, and wait for plan approval before construction.¹³²⁴²⁵
6. Obtain a county floodplain development permit if the site is in an identified flood-hazard area.²⁶
7. Schedule the required building and septic inspections through the responsible offices.¹³²⁰

What should you check before buying land in Greene County?

Confirm the parcel's township or municipality, zoning district, and mapped standards before treating the land as buildable.¹⁸ Budget for septic due diligence because 0% of Greene County soils are rated free of severe limits for a conventional drain field.⁸ Check the flood map early because development in an identified flood-hazard area requires a county permit.²⁶ For land outside a municipality, a major subdivision involving new lots, utility extensions, streets, or drainage improvements goes through the Regional Planning and Coordinating Commission.⁹ A division creating a parcel under 5 acres generally falls within Ohio's subdivision definition, subject to statutory exceptions.²⁷ Verify road ownership because a new or modified driveway along a county road needs a County Engineer permit before construction.²⁸

Watch-outs

• Greene County has no countywide zoning ordinance, but township and municipal zoning still applies; do not treat the absence of county zoning as permission for an RV, tiny home, or accessory dwelling.²³
• Greene County owner-builders may direct residential construction for their own use, but they still need applicable plan approval and permits.⁶
• None of Greene County's soils are rated free of severe limits for a conventional septic drain field, so budget for a site evaluation and a possible engineered system rather than a standard trench field.⁸

Sources

1. Building Regulation, quoted and re-checked
2. greenecountyohio.gov, quoted and re-checked
3. gis.greenecountyohio.gov, quoted and re-checked
4. On-site Sewage Treatment Systems, quoted and re-checked
5. On-site Sewage Treatment Systems, quoted and re-checked
6. Section 4703.18 | Prohibiting practice without certificate, quoted and re-checked
7. Greene County Zoning Center (township and municipal zoning inspectors) (greenecountyohio.gov)
8. 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
9. Major Subdivisions, quoted and re-checked
10. Current Building Codes, quoted and re-checked
11. Greene County Department of Building Regulation (greenecountyohio.gov)
12. Section 3781.06 | Public buildings to be safe and sanitary - definitions (Ohio statewide rule), quoted and re-checked
13. Building Regulation, quoted and re-checked
14. Building Regulation, quoted and re-checked
15. Greene County Building Regulation 2026 Fee Schedule, quoted and re-checked
16. Commercial Certificate of Occupancy Information, quoted and re-checked
17. Dayton: Zoning Code & Map (Greene County), quoted and re-checked
18. Layer: Zoning, quoted and re-checked
19. On-site Sewage Treatment Systems, quoted and re-checked
20. On-site Sewage Treatment Systems, quoted and re-checked
21. Chapter 4781-7 | Manufactured home inspections (Ohio statewide rule), quoted and re-checked
22. Sewage and Water, quoted and re-checked
23. Private Water Systems, quoted and re-checked
24. Building Regulation, quoted and re-checked
25. Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
26. Residential/Commercial Flood Plain Worksheet, quoted and re-checked
27. Section 711.001 | Plat definitions (Ohio statewide rule), quoted and re-checked
28. Permits, quoted and re-checked

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.