Unincorporated DeKalb County, Indiana requires a building permit for most construction, issued by the county's Building Department, and uses a Unified Development Ordinance for zoning12. Septic systems need separate county Health Department review, and an RV cannot be used as living quarters where the county UDO applies34.
At a glance
- Building permit
- Required countywide outside Auburn and Altona, issued by the DeKalb County Building Department1
- Zoning
- The county UDO applies outside municipal planning jurisdictions and in Corunna; lot standards vary by district56
- Septic (OSSF) permit
- The county Health Department licenses and inspects residential systems, reviews plans and registers installers7
- Owner-builder exemption
- Not confirmed; ask the DeKalb County Building Department before acting as your own contractor8
- Building code
- 2014 Indiana Building Code and 2020 Indiana Residential Code9
- 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 apply10
- RV living
- An RV may not be used as living quarters where the county Unified Development Ordinance applies4
Who to call
Building permits
DeKalb County Building Department (Department of Development Services)
Building permits, inspections and Certificates of Occupancy in unincorporated DeKalb County (Auburn and Altona issue their own within city limits)
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
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 September 29, 2026.
Do you need a building permit in DeKalb County, Indiana?
Yes, most construction in unincorporated DeKalb County requires a county building permit; Auburn and Altona issue permits within their own limits1. The DeKalb County Building Department issues Improvement Location Permits and building permits and handles inspections and Certificates of Occupancy in its jurisdiction1. 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 structures9. Contact the Building Department before starting an addition, remodel, reconstruction or swimming-pool project so the office can explain the required documents11.
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) 925-302111. 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 require11. The Building Department also schedules building inspections within its jurisdiction11. For land-use questions, the DeKalb County Plan Commission maintains the county comprehensive plan, Unified Development Ordinance, permit process and official zoning map12. The Plan Commission uses the same street address, and messages for commission members can be sent to [email protected]12.
Does DeKalb County have zoning?
Yes. The DeKalb County Unified Development Ordinance applies outside the legally established planning jurisdictions of cities and towns, and it also applies in Corunna5. The Plan Commission maintains the county comprehensive plan and Unified Development Ordinance12. Minimum lot area depends on the parcel's zoning district rather than one countywide acreage rule6. The county also regulates subdivision plats, replats and development plans in its UDO jurisdiction through Plan Commission approval13. Before designing a house, outbuilding or land split, ask the Plan Commission to confirm the governing jurisdiction, zoning district, allowed use, lot standard and required approval for that parcel5613.
How do septic permits work in DeKalb County?
The DeKalb County Health Department's Environmental Health division licenses and inspects residential on-site sewage systems and reviews plans for new or replacement systems7. All septic installers working in DeKalb County must be registered with that department7. Only about 3.5% of DeKalb County's soils lack severe limitations for a conventional septic drain field14, so request the parcel's septic records and consider hiring a soil scientist before buying land without public sewer15. Indiana's on-site sewage rule is administered locally under state review, and drywells or cesspools are not allowed1617.
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 the DeKalb County Unified Development Ordinance4. The UDO's recreational-vehicle definition includes travel trailers, truck campers, camping trailers, boats and self-propelled motor homes4. Indiana's campground rules do not create a residential exception for a private parcel: those rules concern regulated campgrounds and do not establish general permission for long-term RV living elsewhere18. We could not confirm a separate DeKalb County tiny-home occupancy standard, so ask the Plan Commission how the proposed unit would be classified and whether its zoning district allows that use2. Do not assume that wheels, a small footprint or calling a unit temporary avoids zoning, building or septic review.
Building a home in DeKalb County: the steps, in order
- Ask the Plan Commission to confirm the parcel's governing jurisdiction, zoning district, allowed use and site-plan requirements12.
- Apply for the required Improvement Location Permit and building permit through the DeKalb County Building Department12.
- Have the site evaluated for septic suitability and follow the county Health Department's permit packet for a new or replacement system15.
- Use a septic installer registered with the DeKalb County Health Department15.
- If the driveway connects to a state highway, apply through the INDOT Electronic Permit System; permission is required for construction within a state-highway right-of-way19.
- If development reaches a mapped floodway, check Indiana DNR requirements because the Division of Water regulates most floodway development activities20.
- Arrange required inspections with the Building Department and confirm the Certificate of Occupancy requirement for the project1.
What to check before you buy land in DeKalb County
Zoning and permits: confirm which planning jurisdiction governs the parcel, because the county UDO applies outside municipal planning jurisdictions and in Corunna5. Lot and division plans: ask the Plan Commission for the district-specific lot standard and required approval before relying on acreage or splitting land613. Septic: request the parcel's records and consider a soil scientist's review before buying, since only about 3.5% of DeKalb County's soils lack severe limitations for a conventional drain field1514. Water: DeKalb County averages 37.4 inches of precipitation a year and sees severe drought in about 2.7% of years2122. Taxes: the effective property tax rate is about 0.6%, with a median annual bill near $1,1172324.
Watch-outs
- Auburn and Altona issue their own building permits within city limits; the DeKalb County Building Department's process applies only outside those cities1.
- An RV cannot be used as living quarters where the DeKalb County Unified Development Ordinance applies4.
- We could not confirm an owner-builder exemption; ask the DeKalb County Building Department before acting as your own contractor8.
Sources
- DeKalb County, Indiana - Building Department (2026 county census)
- DeKalb County, Indiana - Plan Commission (2026 county census)
- Environmental Health / DeKalb County, Indiana (2026 county census)
- 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
- Environmental Health / DeKalb County, Indiana, quoted and re-checked
- (2026 county census)
- DHS: Rules of the Indiana Fire Prevention and Building Safety Commission, quoted and re-checked
- Plan Review FAQs (Indiana statewide rule), quoted and re-checked
- DeKalb County Building Department (Department of Development Services) (co.dekalb.in.us)
- DeKalb County Plan Commission (co.dekalb.in.us)
- DeKalb County Unified Development Ordinance, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- DeKalb County Health Department, Environmental Health (co.dekalb.in.us)
- 410 IAC 6-8.3 Residential On-Site Sewage Systems (Indiana statewide rule), quoted and re-checked
- 410 IAC 6-8.3 Residential On-Site Sewage Systems (Indiana statewide rule), quoted and re-checked
- Environmental Public Health: 410 IAC 6-71 Campgrounds (Indiana statewide rule), 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
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
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.