Bolthole Index

Greene County, Ohio

Zoning, building permits and septic rules in Fairborn, Ohio

Fairborn, Ohio has its own Planning and Zoning Code, so zoning inside city limits is set by the city, not Greene County1. The City of Fairborn also runs its own building permits and inspections, which Greene County Building Regulation does not cover23. Septic and well permits are a Greene County Public Health matter in the county, but we could not confirm who handles them inside the city4.

At a glance

Building permit
Required; issued by the City of Fairborn, not the county23
Zoning
City Planning and Zoning Code applies inside city limits1
Building code
Residential Code of Ohio, adopted by the city53
Minimum home size
AG district: 2,000 sq ft for a single-family home; SR district: 1,500 sq ft one-story, 2,000 sq ft two-story67
Minimum lot
AG district: 5 acres; SR district: 15,000 sq ft per single-family home89
Septic
Greene County Public Health countywide; city-limits rule unconfirmed4

Who to call

Building permits

City of Fairborn Building Code & Inspection Division

Building permits and inspections inside Fairborn city limits

(937) 754-3030

44 W. Hebble Avenue, Fairborn, OH 45324

Online permits →

Zoning

City of Fairborn Planning Division

Zoning questions, zoning approvals and the zoning map for Fairborn

(937) 754-3030

44 W. Hebble Avenue, Fairborn, OH 45324

Septic permits

Greene County Public Health, Environmental Health Division

Septic system design review, permitting and inspection in Greene County

937-374-5600

360 Wilson Drive, Xenia, OH 45385

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Fairborn means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Fairborn, Ohio?

Yes, building in Fairborn means getting a permit from the City of Fairborn. Greene County Building Regulation serves most of the county but excludes Fairborn City2, so the county counter is the wrong office for a lot inside city limits. Fairborn adopted the Residential Code of Ohio for one-, two- and three-family homes and their accessory structures5, and the city's Building Code & Inspection Division states it enforces the 2019 Residential Code of Ohio3. Ohio law also bars an owner from starting construction until plans have been approved10. Owner-builders still submit plans to the building department11. We could not confirm the city's permit-fee amounts or its owner-builder rules, so ask the Building Code & Inspection Division at (937) 754-3030 before you budget3.

Who issues building permits in Fairborn, and how do you reach them?

The City of Fairborn Building Code & Inspection Division issues building permits inside the city, at 44 W. Hebble Avenue, Fairborn, OH 45324, phone (937) 754-30303. The city's Planning Division handles the zoning side at the same address12. The city publishes an online portal for applications and permits on its building division page, and the same page carries checklists and fee tables.

Does Fairborn have zoning, and what does it mean for homes, lots and setbacks?

Fairborn has its own zoning: land use inside city limits is subject to the city's Planning and Zoning Code1. Greene County itself has no countywide zoning, because each township, village and city zones for itself13. Rules differ by district. In the AG Agricultural district, a single-family home needs at least 2,000 square feet of livable area6, lots need 5 acres minimum8, and a principal building must sit 100 feet back from the front, with 50 feet for each side yard and 50 feet at the rear14. In the SR Suburban Residential district, single-family lots need 15,000 square feet minimum9, one-story homes need 1,500 square feet of livable area and two-story homes 2,0007, with a 20-foot front setback and 10 feet on each side15. Principal buildings in both districts top out at 35 feet1617. Confirm which district a parcel is in with the Planning Division and the city's zoning map12.

How do septic permits work in Fairborn?

Septic permits in Greene County come from Greene County Public Health's Environmental Health Division, which permits and inspects new sewage system installations418. Ohio law requires an installation permit from the board of health for any new or replacement system19. Private systems are meant for lots where a sanitary sewer connection is not possible20, and state rules require connecting to a public sewer where one is accessible21. We could not confirm who regulates septic or wells for a lot inside Fairborn city limits, so call Greene County Public Health at 937-374-5600 and the city's Building Code & Inspection Division before planning a private system or well18.

Can you live in an RV or tiny home in Fairborn?

We could not confirm what the Fairborn zoning code says about living in an RV, camping on a lot, or building a tiny home or accessory dwelling. Do not rely on Greene County's answers here: the county's statements apply to unincorporated land, and the county does not zone13. Ask the city Planning Division at (937) 754-3030 and get the answer in writing before you buy12.

Building a home in Fairborn: the steps, in order

  1. Confirm the parcel's zoning district with the Planning Division, since lot size, home size and setbacks all depend on it12.
  2. Check whether a public sewer reaches the lot, because Ohio requires connection where one is accessible21.
  3. If no sewer is available, contact Greene County Public Health about a septic permit18.
  4. Submit plans to the City of Fairborn Building Code & Inspection Division for the residential building permit3.
  5. Schedule inspections with the city; all work authorized by a permit is inspected3.

What stays with Greene County, and what to check before you buy

For land outside city limits, use the Greene County page. Greene County Building Regulation handles building permits for most of the county but not Fairborn2, and driveways onto county roads need a county permit22. Floodplain development permits apply in identified flood hazard areas, and Fairborn's own flood damage reduction chapter also exists, though we could not confirm its permit steps23. Greene County's effective property tax rate is 1.7%24.

Watch-outs

  • Fairborn's septic and well rules inside city limits are unconfirmed, so ask Greene County Public Health and the city before relying on a private system18.
  • Fairborn's permit fee amounts were not confirmed, so ask the Building Code & Inspection Division for the current fee tables25.
  • Minimum home sizes in Fairborn are large for a small-home plan: 2,000 square feet in the AG district6.

Sources

  1. PART ELEVEN - PLANNING AND ZONING CODE (Fairborn), quoted and re-checked
  2. Building Regulation, quoted and re-checked
  3. City of Fairborn Building Code & Inspection Division (fairbornoh.gov)
  4. On-site Sewage Treatment Systems, quoted and re-checked
  5. 1303.01 CODE ADOPTED; IDENTITY AND PURPOSE (Fairborn), quoted and re-checked
  6. 1122.02 AG AGRICULTURAL (Fairborn), quoted and re-checked
  7. 1122.04 SR SUBURBAN RESIDENTIAL (Fairborn), quoted and re-checked
  8. 1122.02 AG AGRICULTURAL (Fairborn), quoted and re-checked
  9. 1122.04 SR SUBURBAN RESIDENTIAL (Fairborn), quoted and re-checked
  10. Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
  11. Section 3791.04 | Submission of plan - approvals - prohibition - fine (Ohio statewide rule), quoted and re-checked
  12. City of Fairborn Planning Division (fairbornoh.gov)
  13. greenecountyohio.gov, quoted and re-checked
  14. 1122.02 AG AGRICULTURAL (Fairborn), quoted and re-checked
  15. 1122.04 SR SUBURBAN RESIDENTIAL (Fairborn), quoted and re-checked
  16. 1122.04 SR SUBURBAN RESIDENTIAL (Fairborn), quoted and re-checked
  17. 1122.02 AG AGRICULTURAL (Fairborn), quoted and re-checked
  18. Greene County Public Health, Environmental Health Division (greenecophoh.gov)
  19. Rule 3701-29-09 | Site review and permits for STS installation and operation (Ohio statewide rule), quoted and re-checked
  20. Sewage and Water, quoted and re-checked
  21. Rule 3745-42-07 | Best available technology for connection into sanitary sewers and centralized collection and treatment (Ohio statewide rule), quoted and re-checked
  22. Permits, quoted and re-checked
  23. Residential/Commercial Flood Plain Worksheet, quoted and re-checked
  24. Effective property tax rate: Bolthole Index county data
  25. CHAPTER 1311 Permit and Inspection Fees (Fairborn), quoted and re-checked

Written October 24, 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.

Answers from the rulebook for Fairborn

Fairborn’s own rules

  • Building code adoptedAdopted (with conditions)

    One-, two-, and three-family dwellings and their accessory structures inside Fairborn city limits.

    • The adopted Residential Code is promulgated by the Ohio Board of Building Standard.
    • The ordinance states that the code governs erection, construction, repair, alteration, and maintenance of covered dwellings and accessory structures.
    “is hereby adopted by the City of Fairborn.”
  • Local zoningPresent (with conditions)

    Land inside Fairborn city limits.

    • Land use is subject to Fairborn's Planning and Zoning Code.
    “PART ELEVEN - PLANNING AND ZONING CODE PART ELEVEN - PLANNING AND ZONING CODE”
  • Zoning districtsPublished (with conditions)

    Zoning districts inside Fairborn city limits.

    • The published list includes residential, agricultural, commercial, industrial, parkland, civic/institutional, wellhead, and overlay districts.
    “AG Agricultural. [...] WP Well Field Protection Overlay District.”
  • Permit feesPublished (with conditions)

    Building, demolition, moving, electrical, and mechanical permits in Fairborn city limits.

    • The operative dollar schedules and fee exceptions were not opened.
    • Chapter 1311 also lists plan-review, reinspection, refund, and penalty provisions.
    “1311.03 Building construction, alteration or repair permits. 1311.04 Demolition permits. 1311.05 Moving building permits. 1311.06 Certificates of use and occupancy.”
  • Permit processPartial

    Zoning decisions and approvals inside Fairborn city limits.

    • This claim addresses the published zoning-administration process, not the separate construction-permit application process.
    “1132.01 Decision making responsibilities. 1132.02 Zoning Administrator reviews and decisions. 1132.03 Board of Zoning Appeals review and decisions. 1132.04 Planning Board review and approvals.”

Rules another office applies inside Fairborn

Fairborn does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum dwelling sizeSpecified

    Single-family and duplex dwellings in Fairborn's SR Suburban Residential district.

    • One-story single-family dwellings have a 1,500-square-foot minimum livable area.
    • Two-story single-family dwellings have a 2,000-square-foot minimum livable area.
    • A duplex unit has a 1,000-square-foot minimum livable area.

    one-story single-family minimum livable area: 1500 square feet · two-story single-family minimum livable area: 2000 square feet · duplex-unit minimum livable area: 1000 square feet

    “1,500 [...] 2,000 [...] 1,000 square feet.”
    One more reviewed finding on this topic
    • Specified — Single-family dwellings in Fairborn's AG Agricultural district.
      “The minimum livable area shall be 2,000 square feet.”
  • Minimum lot sizeSpecified

    Lots in Fairborn's AG Agricultural district.

    minimum lot area: 5 acres · minimum lot width: 300 feet

    “Lot Area | All | 5 acres minimum Lot Width | All | 300 feet minimum Setbacks | Principal Front Yard | All | 100 feet minimum”
    One more reviewed finding on this topic
    • Specified — Single-family and duplex lots in Fairborn's SR Suburban Residential district.
      “Lot Area Per Dwelling Unit | Duplex | 7,500 square feet minimum | Single Family | 15,000 square feet minimum”
  • SetbacksSpecified

    Principal buildings in Fairborn's AG Agricultural district.

    • Accessory structures have separate standards, including no front-yard placement.

    front-yard setback: 100 feet · side-yard setback: 50 feet (each yard) · rear-yard setback: 50 feet

    “Setbacks | Principal Front Yard | All | 100 feet minimum Side Yard | All | 50 feet minimum for each yard Rear Yard | All | 50 feet minimum”
    One more reviewed finding on this topic
    • Specified — Single-family dwellings in Fairborn's SR Suburban Residential district.
      “Front Yard | All | 20 feet minimum Side Yard | Duplex | 6 feet minimum for each yard Single Family | 10 feet minimum for each yard”
  • Lot coverageSpecified

    Lots in Fairborn's AG Agricultural district.

    • Accessory-structure rear-yard coverage and footprint limits are separately stated.

    maximum lot coverage: 20 percent (all uses)

    “Size | 25% maximum rear yard coverage and 60% maximum square feet of principal structure footprint Coverage Maximum Lot Coverage | All | 20%”
    One more reviewed finding on this topic
    • Specified — Lots in Fairborn's SR Suburban Residential district.
      “Maximum Lot Coverage | All/Single Family Duplex | 30%40%”
  • Building heightSpecified

    Buildings in Fairborn's AG Agricultural district.

    • Accessory buildings may not exceed 20 feet or the principal structure's height, whichever is less.

    principal-building maximum height: 35 feet · accessory-building maximum height: <= 20 feet (or no taller than principal structure, whichever is less)

    “Height Principal Building | All | 35 feet maximum Accessory Building | 20 feet maximum or no taller than principal structure, whichever is less”
    One more reviewed finding on this topic
    • Specified — Buildings in Fairborn's SR Suburban Residential district.
      “Height | Principal Building | All | 35 feet maximum Accessory Building | 20 feet maximum or no taller than principal structure, whichever is less”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Fairborn or Greene County directly.

  • Building permit — Residential construction inside Fairborn city limits.
  • Owner-builder exemption — Owner-built residences inside Fairborn city limits.
  • Inspections — Residential construction inside Fairborn city limits.
  • Certificate of occupancy — Residential occupancy inside Fairborn city limits.
  • Living in an RV — Long-term residential occupancy of recreational vehicles on private land inside Fairborn city limits.
14 more unanswered
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Fairborn publishes no rule on the point, not that none exists. Greene County’s page lists the county offices to call.

← All of Greene County: county rules, score and offices