Unincorporated DeKalb County, Indiana requires a building permit for most construction, issued by the county Building Department1. County zoning covers land outside legally established city and town planning jurisdictions, plus Corunna; the county ordinance prohibits using an RV as living quarters23. Residential septic systems need separate county Health Department review4.
At a glance
- Building permit
- Required in unincorporated DeKalb County; confirm the building-permit office for municipal addresses1
- Zoning
- County zoning applies outside city and town planning jurisdictions and in Corunna25
- Septic approval
- The county Health Department reviews, licenses and inspects residential systems; sewer connection is required when reasonably available46
- Minimum home size
- District-specific where the applicable zoning layout sets a minimum dwelling size7
- Manufactured home
- A permitted dwelling use in the R3 Village Residential District; other districts may differ8
- Agricultural building exemption
- Exempt from state Class 1 design-release review if used only for an agricultural purpose and not retail; local permit and zoning rules can still apply9
- RV living
- An RV may not be used as living quarters under county zoning, including in Corunna32
Who to call
Building permits
DeKalb County Building Department (Department of Development Services)
Building permits and inspections in the county Building Department’s jurisdiction; confirm the responsible office for a municipal address
301 S Union St, Auburn, IN 46706
Planning & zoning
Administers the DeKalb County Comprehensive Plan and Unified Development Ordinance (zoning), approves plats, development plans and zone map amendments
plancommission@co.dekalb.in.us
301 S Union St, Auburn, IN 46706
Septic permits
DeKalb County Health Department, Environmental Health
Licenses and inspects residential on-site sewage (septic) systems, reviews plans for new or replacement systems, and registers septic installers
220 E Seventh St, Auburn, IN 46706
Contact details are copied from each office’s official page and were checked against it on October 12, 2026.
Off-grid gear
Going off-grid in DeKalb County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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Do you need a building permit in DeKalb County, Indiana?
Most construction in unincorporated DeKalb County requires a county building permit, and permitted projects must complete the inspections required for the project110. Inside Ashley, the town requires its own improvement location permit before construction or reconstruction11. Residential septic review remains with the DeKalb County Health Department4. The applicable codes include the 2014 Indiana Building Code for commercial and nonresidential work and the 2020 Indiana Residential Code for Class 2 structures and their accessory structures12. Contact the county Building Department before starting an addition, remodel, reconstruction or swimming-pool project so the office can explain the required documents13.
Who is the DeKalb County building department, and how do you reach them?
The DeKalb County Building Department is at 301 S Union St, Auburn, IN 46706, and its phone number is (260) 925-302113. The office asks people planning to build, add on, remodel, reconstruct or install a swimming pool to contact it for an explanation of what the project will require13. County zoning petitions require a complete application, and the Zoning Administrator has up to 15 days after filing to determine completeness14. Fees come from the Plan Commission Rules of Procedure, and all applicable charges must be paid before final action15. For land-use questions, contact the Plan Commission at plancommission@co.dekalb.in.us16.
Does DeKalb County have zoning?
DeKalb County has zoning, but the county Unified Development Ordinance excludes legally established city and town planning jurisdictions and expressly includes Corunna25. Butler, Waterloo and Ashley have their own zoning171819. The county Health Department reviews residential septic systems; Waterloo also requires town private-sewage approval where public sewer is unavailable420. Ask the Plan Commission to locate the parcel on the Official Zoning Map and identify its district layout before designing a home212216. Minimum lot area varies by district: the Manufactured Home Park (MP) District requires 2 net acres, or 1 acre with municipal sanitary sewer, excluding dedicated rights-of-way and recorded easements from net acreage23. That park standard is not a general minimum for a rural homesite; use the parcel’s own district standards for lot area, dwelling size and setbacks23724.
How do septic permits work in DeKalb County?
The DeKalb County Health Department's Environmental Health division administers the state onsite-sewage rule locally, reviews plans, and licenses and inspects residential systems254. All septic installers working in DeKalb County must be registered with that department4. If sanitary sewer is available within a reasonable distance, Indiana prohibits a new onsite system and requires connection to the sewer6. Otherwise, a dwelling must have a compliant septic tank and soil-absorption system; a holding tank is only conditionally available with written approval26. Request final inspection under the local procedure before covering subsurface work27. Only about 3.5% of county soils lack severe limitations for a conventional drain field, so review septic records and soil suitability before buying2829.
Can you live in an RV or tiny home on your land in DeKalb County?
A recreational vehicle cannot be used as living quarters on land governed by DeKalb County zoning, including Corunna and unincorporated land outside municipal planning jurisdictions32. The ordinance’s campground and RV-park definitions describe short-term occupancy; those definitions do not override the separate living-quarters prohibition3. We could not confirm temporary camping permissions or a separate tiny-home occupancy rule; ask the Plan Commission about the proposed use and any minimum dwelling size in the parcel’s district716. A manufactured home is a permitted dwelling use in the R3 Village Residential District, but other districts may use different permissions or special-exception rules8. Both owner-occupied and non-owner-occupied short-term rentals are allowed in R3; that answer does not establish permission in another district30.
Building a home in DeKalb County: the steps, in order
- Ask the Plan Commission to identify the governing jurisdiction, zoning district, allowed use, setbacks and other dimensional standards312224.
- Ask whether a land division needs subdivision approval, then submit the required site plan and complete applications3214.
- Confirm the applicable fees and pay all charges before final action15.
- Apply for the building permit through the DeKalb County Building Department1.
- Determine whether sewer is reasonably available; connect if it is, or have the Health Department review the septic plan if it is not64.
- Resolve local-road or state-highway access with the appropriate authority3334.
- Check Indiana DNR requirements for mapped floodway development, then schedule building and septic inspections before covered work becomes inaccessible353627.
What to check before you buy land in DeKalb County
Zoning: confirm the planning jurisdiction and mapped district, because county zoning excludes legally established municipal planning jurisdictions but includes Corunna221. Dimensions: obtain the applicable district layout for lot area, dwelling size, coverage, height and setbacks; the Manufactured Home Park acreage standard and Agricultural Business standards do not establish a general rural homesite minimum23377383924. Land division: ask whether the parcel or proposed split needs Plan Commission subdivision approval32. Septic and sewer: determine whether sewer connection is required, then request septic records and consider a soil scientist’s review if onsite treatment is needed629. Only about 3.5% of DeKalb County soils lack severe limitations for a conventional drain field28. Private-well permitting remains unconfirmed, so ask Environmental Health before drilling40.
Watch-outs
- Municipal planning jurisdictions can reach beyond town limits; confirm the parcel’s zoning jurisdiction with the DeKalb County Plan Commission before relying on county standards51716.
- An RV cannot be used as living quarters under DeKalb County zoning, including in Corunna; we could not confirm temporary camping permissions32.
- We could not confirm an owner-builder exemption; ask the DeKalb County Building Department before acting as your own contractor41.
- A new septic system is prohibited where sanitary sewer is available within a reasonable distance; connection is required instead6.
Sources
- DeKalb County, Indiana - Building Department (2026 county census)
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- Environmental Health / DeKalb County, Indiana, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- Environmental Public Health: Onsite Sewage Systems Program, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- co.dekalb.in.us, quoted and re-checked
- Plan Review FAQs (Indiana statewide rule), quoted and re-checked
- DeKalb County Improvement Location Permit, quoted and re-checked
- Town of Ashley: Sec. 10-5 Adoption (DeKalb County), quoted and re-checked
- DHS: Rules of the Indiana Fire Prevention and Building Safety Commission, quoted and re-checked
- DeKalb County Building Department (Department of Development Services) (co.dekalb.in.us)
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Plan Commission (co.dekalb.in.us)
- Butler: City of Butler, Indiana Zoning Ordinance — Full Searchable Edition (DeKalb County), quoted and re-checked
- Town of Waterloo: § 153.01 Zoning Code Adopted (DeKalb County), quoted and re-checked
- Town of Ashley: official source (DeKalb County), quoted and re-checked
- Town of Waterloo: § 51.101 Private Sewage Disposal (DeKalb County), quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance — Lot Standards, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- 410 IAC 6-8.3 Residential Onsite Sewage Systems, quoted and re-checked
- 410 IAC 6-8.3 Residential Onsite Sewage Systems, quoted and re-checked
- 410 IAC 6-8.3 Residential Onsite Sewage Systems, quoted and re-checked
- 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
- DeKalb County Health Department, Environmental Health (co.dekalb.in.us)
- co.dekalb.in.us, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- DeKalb County Unified Development Ordinance, quoted and re-checked
- INDOT Driveway Permit Guide 2024 (Indiana statewide rule), quoted and re-checked
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
- co.dekalb.in.us, quoted and re-checked
- co.dekalb.in.us, quoted and re-checked
- co.dekalb.in.us, quoted and re-checked
- co.dekalb.in.us, quoted and re-checked
- Recommended Standards For Private Water Wells (Indiana statewide rule), quoted and re-checked
- (2026 county census)
Written October 12, 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.