Unincorporated Grant County, Indiana requires building permits for new structures, additions and many alterations1. The Grant County Area Plan Department administers permits, inspections, zoning and subdivision controls in county jurisdiction, while Marion and Gas City issue their own permits23. Septic permits come from the Grant County Health Department4.
At a glance
- Building permit
- Required for new structures, additions, HVAC work, many remodels and repairs, pools, decks, porch enclosures and roof replacement in county jurisdiction1
- Building inspections
- Required for covered Area Plan projects; schedule through the Area Plan office5
- Zoning
- Yes; Area Plan administers zoning in unincorporated Grant County and participating towns67
- Septic
- County Health Department permit required for construction, replacement, repair or alteration48
- RV living
- Temporary only in covered residential and rural districts: up to 10 days in any six-month period; ask Area Plan about other circumstances9
- Owner-builder exemption
- Not confirmed; ask Area Plan before assuming an exemption10
- Lot standards
- Minimum area, lot coverage, height and setbacks vary by zoning district and sewer service11121314
- Private wells
- Local permit requirement unconfirmed; Indiana says some health departments require permits15
Who to call
Building permits
Grant County Area Plan Department
Improvement location and building permits, inspections, zoning and subdivision administration
401 S. Adams Street Marion, IN 46953, 4th Floor
Septic permits
Grant County Health Department
Contact for residential onsite septic systems
401 S Adams St. | Marion, IN 46953
Septic permits
Grant County Health Department, Environmental Division
Residential onsite septic site visits, plan reviews, permits and inspections
Roads & driveways
Grant County Highway Department
County-road maintenance and access questions
3939 Garthwaite Road Gas City, IN 46933
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Grant County, Indiana?
Yes. Unincorporated Grant County requires permits for new structures, additions, HVAC work, many remodels and repairs, pools, decks, porch enclosures and roof replacement1. Grant County has adopted a building code that incorporates Indiana building rules and standards, and Area Plan administers and enforces it16. Indiana's residential code also applies statewide to covered homes and accessory structures17. Required inspections must be scheduled for permitted work, and missed inspections can lead to violations, fines or a stop-work order5. Before occupying a covered structure or changing its use, obtain a certificate of occupancy; issuance follows inspection, approved sanitation and compliance with applicable health, building and fire codes18.
Who handles Grant County building permits and inspections?
The Grant County Area Plan Department is the building and zoning office for unincorporated Grant County and participating communities2. Marion and Gas City issue their own permits, so property inside either city must go to the city office2. Area Plan is at 401 S. Adams Street in Marion on the fourth floor; call (765) 668-4765 or email [email protected]2. Applications may be made in person until 3 p.m. or submitted by drop-off, fax, scan or email; straightforward applications are generally ready by the next day, while questions, new homes and commercial work can take longer19. Area Plan also performs the inspections tied to its permits2.
Does Grant County, Indiana have zoning?
Yes. Grant County has an area-wide zoning ordinance administered by the Area Plan Commission3. The ordinance's land-use table distinguishes permitted uses, special-exception uses and prohibited uses by district, so identify the district before choosing a house type or business use20. In several named districts, a single-family lot must have at least 6,000 square feet with sewer service or 43,560 square feet without it11. Single-family lot coverage ranges from 20% to 40%, and maximum building height ranges from 30 to 40 feet, depending on district1213. Most residential parcels also have district-specific front, side and rear setbacks14. Administration varies inside municipalities, so confirm jurisdiction before relying on county tables7.
How do septic permits work in Grant County?
The Grant County Health Department issues residential onsite septic permits and handles site visits, plan review and inspections421. A permit is required before constructing, replacing, repairing or otherwise altering a septic system, including plumbing work more than 2 feet beyond the foundation8. The published permit fees are $150 for new construction, $125 for replacement and $50 for repair; independent soil-evaluation fees are typically $350 to $40022. Call (765) 651-2401 before fixing the house location23. A home without sewer must use an allowed septic system or sanitary privy, and sewage cannot discharge to a tile, ditch, creek, stream or anything other than a leachfield24. Because 0% of mapped soils are rated free of severe limits for a conventional drain field, make approval a purchase contingency25.
Can you live in an RV or tiny home in Grant County?
In covered Grant County residential and rural districts, an RV or similar recreational unit may be occupied temporarily for no more than 10 days in any six-month period9. In those districts, a stored RV cannot connect to utilities, sewage, septic or water outside an RV park, except for limited electricity to prevent freezing9. Ask Area Plan about the parcel's district because we could not confirm one rule covering every RV circumstance. We also could not confirm a distinct tiny-home rule or a numeric minimum dwelling size. A small permanent home still must fit its district's allowed uses, lot area, coverage, height and setbacks2011121314. A short-term rental of a covered dwelling requires an Area Plan permit for each property26.
Building a home in Grant County: the steps, in order
- Confirm whether Area Plan, a participating town or a city has jurisdiction; Marion and Gas City issue their own permits27.
- If dividing land, obtain the required subdivision approval before seeking a building permit; the minor-subdivision path applies only along an existing improved street and cannot require a new street or public improvements27.
- If sewer is unavailable, complete the Health Department's soil analysis, plan review and septic-permit process8.
- Obtain the applicable county or state driveway permit28.
- Obtain the certificate of occupancy before occupying the structure18.
What should you check before buying land in Grant County?
Start with jurisdiction and zoning because Grant County administers the unincorporated county and participating communities, while local administration varies elsewhere67. Ask Area Plan for the parcel's allowed uses and dimensional limits, including lot area, coverage, height and setbacks2011121314. Make septic approval a purchase contingency because 0% of mapped soils are rated free of severe limitations for a conventional drain field25. Check whether an earlier split received subdivision approval27. Confirm driveway permission with the agency controlling the road28. Before disturbing a floodway, check with Indiana DNR because most floodway development requires state review, while flood-fringe work may still need local approval2930.
Watch-outs
- No owner-builder exemption was established, so do not assume self-performance eliminates permits or inspections10.
- A covered structure cannot be occupied or changed to a new use until Area Plan issues a certificate of occupancy18.
- Grant County's private-well permit requirement is unconfirmed, although Indiana says some local health departments require a permit15.
Sources
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County Area Plan Department (in.gov)
- Grant County: FAQs, quoted and re-checked
- Grant County: Environmental Division FAQs, quoted and re-checked
- Grant County: Hours & General Information, quoted and re-checked
- Grant County: FAQs, quoted and re-checked
- Grant County: FAQs, quoted and re-checked
- Grant County: Environmental Division FAQs, quoted and re-checked
- Grant County Area-Wide Zoning Ordinance, quoted and re-checked
- (2026 county census)
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County: FAQs, quoted and re-checked
- Recommended Standards For Private Water Wells (Indiana statewide rule), quoted and re-checked
- Grant County Code of Ordinances, quoted and re-checked
- Important Information on the Adoption and Implementation of the 2020 Indiana Residential Code, quoted and re-checked
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County: Hours & General Information, quoted and re-checked
- Grant County: FAQs, quoted and re-checked
- Grant County Health Department, Environmental Division (in.gov)
- Grant County: Environmental Division FAQs, quoted and re-checked
- Grant County Health Department (in.gov)
- Grant County: Environmental Division FAQs, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County - Land Usage: Area-Wide Zoning Ordinance, quoted and re-checked
- Grant County: FAQs, quoted and re-checked
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
Written September 29, 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.