Unincorporated Lake County, Indiana requires a building permit for construction through the Lake County Plan Commission's Building Department1. County zoning also applies, while septic permits go through the Lake County Health Department's Environmental Health Division23. Incorporated cities and towns have their own permit jurisdictions4.
At a glance
- Building permit
- Required for construction in unincorporated Lake County1
- Zoning
- County zoning applies to unincorporated land; rules depend on the district2
- Septic permit
- Health Department's Environmental Health Division requires plans, fees and inspections3
- Owner-builder
- Allowed with a notarized Owner Affidavit and licensing-board conditions5
- RV / tiny home
- Full-time occupancy is unconfirmed; ask the Plan Commission for the parcel-specific rule62
- Manufactured home
- Permitted in specified agricultural and residential districts, subject to permits and site rules7
- Property tax
- About 0.9% effective rate; $1,987/yr median bill89
- Conventional septic soils
- Only 1.1% of soils avoid a very-limited rating for conventional drain fields10
Who to call
Building permits
Lake County Plan Commission, Building Department
Building permits, inspections and certificates of occupancy for unincorporated Lake County
2293 N. Main Street, Suite 11, Crown Point, IN 46307-1899
Zoning
Lake County Plan Commission, Zoning
Zone changes, subdivision approvals, special exceptions, variances and zoning-ordinance enforcement for unincorporated Lake County
2293 N. Main Street, Suite 11, Crown Point, IN 46307-1899
Septic permits
Lake County Health Department, Environmental Health Division
Residential on-site wastewater (septic) system permits and inspections for Lake County
2293 N. Main Street, Crown Point, IN 46307
Roads & driveways
Lake County Highway Department
Roads, bridges and small structures outside cities and towns and outside the state highway system in Lake County
1100 East Monitor Street, Crown Point, IN 46307
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Lake County, Indiana?
Yes. Unincorporated Lake County requires a building permit for construction, and the Plan Commission's Building Department issues permits and conducts inspections14. Indiana leaves the building-permit requirement and inspection schedule to the applicable local administrative process11. Lake County requires applicable inspections during permitted work, at least 24 hours' notice, a visibly posted permit and visible survey stakes; a failed inspection can trigger a $50 reinspection fee12. The Plan Commission serves only unincorporated Lake County, so a parcel inside a city or town goes to that municipality instead4. Indiana has statewide model codes amended for the state, but we could not confirm the exact code edition adopted for unincorporated Lake County; ask the Building Department before finalizing plans134.
Who is the Lake County building department, and how do you reach them?
The Lake County Plan Commission's Building Department handles building permits, inspections and certificates of occupancy for unincorporated Lake County; call 219-755-37004. The office is at 2293 N. Main Street, Suite 11, Crown Point, IN 46307-1899, and the county links an online building-permit application4. The Plan Commission's zoning staff uses the same address and phone number for zone changes, special exceptions, variances and subdivision approvals6. A complete application can require the legal description, site and construction plans, ownership information, affidavits, and approvals for septic, utility service, road access or stormwater as applicable14. Lake County requires a written certificate before a covered building may be used or occupied15.
Does Lake County have zoning?
Yes. Unincorporated Lake County has county zoning, and the applicable uses, dimensional standards and approvals depend on the parcel's zoning district16. The published ordinance includes agricultural, residential, business, industrial and special-purpose districts, while the county page links an unincorporated-area zoning map17. The Plan Commission handles changes of zone, special exceptions, variances and subdivision approvals, but has no jurisdiction inside incorporated places6. Manufactured housing is permitted in the listed A-1, RR, R-1, R-2, R-3 and R-5 districts, subject to building permits, zoning standards and other site requirements7. We could not confirm a general agricultural exemption from local permits or zoning, or a parcel-wide answer for setbacks, minimum home size, RV residence or tiny-home occupancy; ask zoning staff about the parcel's district and proposed use6.
How do septic permits work in Lake County?
Lake County's Environmental Health Division requires a permit for a residential septic installation, with plans, fees and inspections in the process3. When a building will use a septic tank, Health Department approval must accompany the building-permit process18. Indiana sets the residential on-site sewage rule, while local health departments issue permits subject to state review19. A dwelling without sewer service needs a compliant septic tank and functioning soil-absorption system; Indiana prohibits drywells and cesspools as on-site sewage treatment20. Only 1.1% of Lake County soils avoid a "very limited" rating for a conventional drain field10. That soil rating does not decide a permit, but it makes an early site evaluation essential and may point toward a system designed for the parcel's conditions10.
Can you live in an RV or tiny home on your land in Lake County?
We could not confirm a countywide right to live full time in an RV or tiny home on unincorporated Lake County land. Indiana's campground rule covers facilities providing space for 10 or more RVs or similar units and excludes tracts divided into individually deeded lots, so it does not answer residential RV use on your own lot21. Indiana's separate limits of 10 consecutive days per event and 30 days per year apply to temporary campgrounds, not automatically to a single deeded parcel22. Ask the Plan Commission to identify the parcel's zoning district and decide whether the proposed unit, occupancy and utilities are allowed616. A manufactured home is a clearer category: Lake County permits manufactured housing in specified agricultural and residential districts, subject to permits and site requirements7.
Building a home in Lake County: the steps, in order
- Call the Plan Commission at 219-755-3700 to confirm county jurisdiction, the zoning district and the allowed use416.
- Lay out the house, well or water connection, septic area and driveway on the site plan, then obtain the outside-agency approvals that apply14.
- If septic is proposed, complete the Health Department's approval process before the building application moves forward18.
- Obtain Highway Department approval for a new or remodeled county-road entrance or culvert; state-highway access instead requires permission through INDOT's permit system2324.
- Submit the application, legal description, plans, ownership documents and affidavits through the county permit process14. An owner-builder must upload a notarized Owner Affidavit and meet the Unincorporated Licensing Board conditions5.
- Post the permit and schedule each applicable inspection with at least 24 hours' notice12.
- Before occupancy, provide the applicable final approvals and obtain the county's written certificate15.
What to check before you buy land in Lake County
Lake County has about 1,004 people per square mile, and the nearest city of 100,000 or more is about 35 miles from the county center2526. Before buying, confirm that the parcel is outside an incorporated place, identify its zoning district, and verify the proposed house type and setbacks with the Plan Commission617. Only 1.1% of county soils avoid a very-limited conventional-drain-field rating, so make septic feasibility an early contingency10. Confirm legal road access and whether a new entrance or culvert needs county or state approval23. Check flood maps too: Indiana DNR regulates most floodway development, while flood-fringe work can still face local or federal rules even without a state permit2728. The effective property-tax rate is about 0.9%, with a $1,987 median annual bill89. A proposed land split also needs Plan Commission review under the county's subdivision rules29.
Watch-outs
- Full-time RV use, temporary camping and tiny-home occupancy on unincorporated Lake County land remain unconfirmed; call the Plan Commission at 219-755-3700 with the parcel and proposed use6.
- Indiana's standards say some local health departments require a permit before drilling a residential water-supply well, but we could not confirm whether Lake County's Health Department does; ask the Environmental Health Division before you drill3031.
- "Lake County" also exists in Illinois, Florida, Ohio and other states; confirm you're looking at Lake County, Indiana results (area code 219, Crown Point address) before trusting a search result4.
- No dedicated floodplain administrator page was found on the county's site; ask the Plan Commission whether your parcel is in a mapped floodplain, and check with Indiana DNR's Division of Water for floodway permitting427.
Sources
- Lake County Plan Commission / Building Department (2026 county census)
- Plan Commission (2026 county census)
- Inspections and Permits, quoted and re-checked
- Lake County Plan Commission, Building Department (lakecountyin.gov)
- Online Building Permit App FAQs, quoted and re-checked
- Lake County Plan Commission, Zoning (lakecountyin.gov)
- Unified Development Ordinance No. 2560, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- DHS: Boards and Commissions (Indiana statewide rule), quoted and re-checked
- Inspections Required by Planning & Building Department, quoted and re-checked
- Rules of the Indiana Fire Prevention and Building Safety Commission (Indiana statewide rule), quoted and re-checked
- Procedure for Requesting a Building Permit, quoted and re-checked
- Inspections Required by Planning & Building Department, quoted and re-checked
- Plan Commission, quoted and re-checked
- Unified Development Ordinance No. 2560, quoted and re-checked
- Residential On-Site Waste Water Disposal Systems, quoted and re-checked
- 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
- Environmental Public Health: 410 IAC 6-71 Campgrounds (Indiana statewide rule), quoted and re-checked
- Procedure for Requesting a Building Permit, quoted and re-checked
- INDOT Driveway Permit Guide 2024 (Indiana statewide rule), quoted and re-checked
- Population density: Bolthole Index county data
- Distance to the nearest metro area: Bolthole Index county data
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
- Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
- Plan Commission, quoted and re-checked
- Recommended Standards For Private Water Wells (Indiana statewide rule), quoted and re-checked
- Lake County Health Department, Environmental Health Division (lakecountyin.gov)
Written September 27, 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.