Building permits, zoning and land rules in Gibson County, Indiana

Gibson County offers applications and guidance for work on flood-zone properties³. We could not confirm the general residential building-permit or inspection rule for unincorporated land outside those areas, so ask the Gibson County Commissioners before breaking ground³. Indiana allows local jurisdictions to administer building permits, plan review and inspections⁹. The 2020 Indiana Residential Code applies to one- and two-family homes and their accessory structures throughout Indiana, including Gibson County, regardless of whether a local permit is required². Contact the county Floodplain Administrator if any part of the site lies in a mapped flood area³.

Gibson County's general residential building-permit and inspection contacts could not be confirmed, so start with the County Commissioners before planning construction³. The Gibson County Health Department specifies septic-system size and type, reviews the installer's plot plan, issues the septic construction permit and inspects installation^4,10. For a flood-zone parcel, contact the county Floodplain Administrator for permit guidance³. Gibson County prohibits fill or excavation for new development or redevelopment in a regulatory floodway unless it is part of a stream-wide restoration or watershed master plan; stormwater and tile outfalls are excepted⁷. The Gibson County Highway Department is the contact for a proposed driveway or culvert entrance on a county-maintained road¹¹. A connection to a state highway requires an INDOT driveway permit¹².

Unincorporated Gibson County has no county plan commission or zoning ordinance, but it does have a subdivision-control ordinance¹. That means the county sets no zoning-based minimum dwelling size or zoning-based building setbacks on unincorporated parcels¹. For the same reason, no county rule sets a minimum lot size or restricts accessory dwelling units or tiny-home occupancy on unincorporated land¹. Septic, subdivision, floodplain, drainage, stormwater and state construction requirements can still control where and how a home is built^1,2. Incorporated places have separate authority: Princeton applies city ordinances to construction and changes in land or structure use, while Owensville regulates mobile-home placement^13,14. Verify the parcel boundary before relying on the county's lack of zoning; we could not confirm current zoning rules for every municipality in Gibson County.

Residential septic systems in Gibson County go through the Gibson County Health Department under Indiana's statewide onsite-sewage framework^4,15. A certified soil scientist must provide a soil profile analysis; the Health Department then specifies the system size and type, reviews the installer's plot plan and issues the construction permit⁴. A new residential permit costs $100 and a repair permit costs $75⁴. Call the Health Department during installation so it can inspect the system^4,10. Only 17.4% of Gibson County soils are free of severe limits for a conventional drain field, so test the proposed site before assuming a standard system will work⁶. An onsite system is prohibited when a sanitary sewer is available within a reasonable distance; the property must connect instead⁵. A privy may not be installed unless a water-carriage sewage disposal system cannot be used¹⁶. A composting or incinerating toilet may be allowed by the local health officer, but it does not replace a compliant onsite sewage system for household wastewater¹⁷.

In unincorporated Gibson County, no county zoning rule restricts tiny-home occupancy, because the county has no zoning ordinance¹. A tiny home built as a house still falls under the statewide residential code and needs a Health Department septic permit if no sewer is available^2,4. For RVs, Gibson County's stormwater ordinance classifies installing a recreational vehicle on a site for more than 180 days as development in unincorporated areas, so a long-term RV placement triggers stormwater review⁷. We could not confirm a general rule on living in one RV on a private lot, and Indiana's campground rule excludes individually deeded lots¹⁸. A qualifying mobile-home community requires a state license and sewer connections for occupied homes, but that rule does not decide whether one manufactured home may sit on an individual unincorporated parcel¹⁹. Inside Princeton and Owensville, municipal rules apply separately^13,14. Ask the Gibson County Health Department about the sewage plan before placing any unit¹⁰.

1. Confirm whether the parcel is unincorporated or inside a municipality; Princeton and Owensville apply their own land-use controls^13,14.
2. Ask the Gibson County Commissioners to confirm the current residential permit and inspection process, which we could not confirm for general construction³.
3. Contact the Floodplain Administrator if the site touches a mapped flood area; Gibson County restricts fill and excavation in regulatory floodways^3,7.
4. Determine whether a sanitary sewer is reasonably available; if so, connect rather than installing septic⁵.
5. If septic is needed, hire a certified soil scientist and apply to the Health Department^4,10.
6. For access, contact the Highway Department about a county road or INDOT about a state highway^11,12.
7. Build to the statewide residential code and have the Health Department inspect the septic system during installation^2,4.

Check soils first: only 17.4% of Gibson County land is free of severe limits for a conventional septic drain field, so obtain a soil profile before counting on a standard system⁶. Also find out whether a sanitary sewer is reasonably available, because an onsite system is prohibited where a connection can be made⁵. For water, the state source does not establish a permit requirement for an ordinary private domestic well, so ask the Gibson County Health Department about any local requirement before drilling^8,10. High-capacity wells generally need no state permit outside Indiana's Great Lakes Basin, but a system capable of supplying at least 100,000 gallons per day may require registration⁸. Review the latest flood map before choosing a building pad because Gibson County restricts fill and excavation in regulatory floodways⁷. Confirm legal road access with the Highway Department, and remember that the absence of county zoning-based setbacks does not displace subdivision, drainage, septic or floodplain controls^1,11.