Lake County occupies the northwest corner of Indiana on Lake Michigan, and it is the state’s second most populous county, with 504,612 people in the Census Bureau’s 2025 estimate. In unincorporated Lake County, building permits are issued by the Lake County Plan Commission. It has no jurisdiction inside the county’s 18 incorporated cities and towns. Class 1 structures need a state Construction Design Release before construction.
This guide covers the department and how to reach it, the local conditions that shape a filing here, what permits cost and who may pull them, and how inspections are booked. Rules that apply everywhere in Indiana are summarized in each section, with a link to the full statewide explanation.
This guide covers unincorporated Lake County, where the Lake County Plan Commission issues permits. The county has no jurisdiction in its 18 incorporated cities and towns, among them Hammond, Gary, Merrillville, Crown Point, East Chicago and Munster.
An Illinois licence is not an Indiana credential. Lake County borders Cook and Will counties in Illinois. Indiana offers no reciprocity for journeyman or contractor plumbers, so plumbing work needs an Indiana licence. In unincorporated Lake County, the Plan Commission tests and licenses contractors under the county’s Contractor’s Licensing Ordinance. The cities and towns set their own rules: Gary, for example, amended its code in 2024 to accept a current licence from another municipality that requires a similar exam, once its Building Commissioner has verified it.
What requires a building permit in Lake County?
Class 1 construction needs a state design release unless 675 IAC 12-6-4 exempts it, and local building permits are required as the local ordinance provides.
Permit required
- New residential and commercial construction, additions, alterations and conversions
- Structural and load-bearing work, foundations, decks, porches, ramps and stairs
- Finishing basements and attics, and any change of use or occupancy
- Electrical service changes, panel work, new circuits, solar and EV charging equipment
- Plumbing alterations, repipes, water heaters, backflow and sewer or gas connections
- HVAC installation and change-out, ductwork and venting; roofing, siding, windows, pools, signs and demolition
Typically exempt
- Painting, wallpapering, tiling, carpeting and cabinet installation
- Minor repairs and finish work replacing materials in kind
- Small accessory structures below the local size threshold, where zoning allows
- Portable equipment or temporary work the adopted rules specifically exempt
Short on time to read all of this?
Get a free quote →Which work needs a local building permit is set by local ordinance, and the Class 1 work that needs no state design release is listed in 675 IAC 12-6-4. An exemption from a building permit is not an exemption from zoning, setbacks, floodplain rules, utility approval or a fire authority review. Confirm scope with the department before work starts rather than after.
Which code edition applies
The Plan Commission and the city and town departments enforce Indiana’s statewide codes, so the technical standard does not change at a municipal boundary. The fee schedule, submittal process, zoning, inspection scheduling and contractor licensing or registration are set locally.
Before construction starts on a Class 1 structure — one used by the public, by three or more tenants, or by anyone working as another’s employee — Indiana requires a state Construction Design Release, unless the work is exempt under 675 IAC 12-6-4. One- and two-family dwellings and qualifying townhouses are Class 2 and are permitted locally where an ordinance requires it. Indiana enforces the 2014 Indiana Building Code and the 2020 Indiana Residential Code. Class 1 and Class 2 in Indiana
Who handles permitting in Lake County?
In unincorporated Lake County, the Lake County Plan Commission issues building permits, conducts inspections and issues certificates of occupancy, with the state design release running ahead of Class 1 work. Applications can be made online. The Plan Commission has no jurisdiction in incorporated areas.
| Detail | Information |
|---|---|
| Authority | Lake County Plan Commission (unincorporated Lake County only) |
| Municipalities inside | 18 cities and towns, including Hammond, Gary, Merrillville, Crown Point, East Chicago and Munster; the county has no jurisdiction there |
| Cross-border note | Indiana offers no reciprocity for journeyman or contractor plumbers |
| Class 1 route | State Construction Design Release before construction, plus the local permit |
| Office | 2293 N. Main Street, Suite 11, Crown Point, Indiana 46307; 219-755-3700; Monday to Friday, 8:30am to 4:30pm |
| Code | Indiana codes adopted by the Fire Prevention and Building Safety Commission; 675 IAC 12 (GAR) |
| Contractor credentials | State plumbing licence; county test and licence for contractors in unincorporated areas |
| Class 1 projects | State Construction Design Release required before construction starts (675 IAC 12-6-3) |
Not sure this scope needs a permit?
Get a free quote →In 2025, building permits issued in unincorporated Lake County authorized 26 new privately owned housing units, all of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
The local building department issues the building permit and inspects the work. On a Class 1 structure the state design release, issued by IDHS or a certified local unit, must come before construction starts; IDHS has 10 business days to respond to a complete application and 20 for a plan review. Plans for Class 1 work over 30,000 cubic feet must be prepared by a registered architect or engineer. The Construction Design Release
Permit types
Residential permits
In unincorporated Lake County, residential permits are issued by the Plan Commission. A building with three or more tenants is Class 1 and needs a state design release before construction (IC 22-12-1-4).
Commercial permits
Commercial and industrial buildings used by the public or by employees are Class 1 structures and need a state design release before construction (IC 22-12-1-4; 675 IAC 12-6-3).
Since 1 January 2026, a unit that requires permits for one- and two-family work must review plans within 7 business days and offer inspections within 3, and the applicant may use a private reviewer or inspector instead (IC 36-7-2.5). Local permits and the 2026 deadlines
Lake County permit costs and fees
Budget two fee streams on Class 1 work: the state design release fee on gross floor area, and the local permit and plan-review fees set by whichever department issues.
Rather talk it over?
Call 1-855-478-4290 →| Fee component | How it works |
|---|---|
| State design release | Class 1 only: $75 filing fee plus a processing fee, generally $0.050 or $0.030 per gross sq ft by occupancy category (675 IAC 12-3-2) |
| Local building permit | Set by the county’s adopted schedule; card payments carry a processor fee of 2.5% or $1.49, whichever is greater |
| Local plan review | Charged under the local department’s schedule |
| Trade permits | Separate electrical, plumbing and mechanical fees |
| Contractor licensing | Contractors in unincorporated areas need a county licence; see the Plan Commission’s 2026 Contractor Licensing Packet |
| Re-inspections and revisions | Charged where the local schedule provides for them |
Need a real number for a specific Lake County project? Send us the scope, address and valuation and we will identify the filing path, the reviews it will trigger and the fee categories that will apply.
Fee schedules are revised on each jurisdiction’s own cycle, so ask the issuing department for the schedule in force on your filing date. On Class 1 work the state design release adds a $75 filing fee plus a processing fee, generally $0.050 per gross square foot. State design release fees
Trade permits and who may pull them
Permit required
- Service installations, panel upgrades, new circuits, solar PV and EV chargers
- New plumbing, repipes, water heater change-outs, fixtures, backflow and gas piping
- HVAC installation and change-out, ductwork, venting and commercial kitchen exhaust
- Sprinkler, standpipe and fire alarm work on Class 1 structures
Typically exempt
- Replacing a fixture, switch, receptacle or light with no alteration to wiring or piping
- Clearing a stoppage without replacing or rearranging concealed piping
- Filter, thermostat and routine component service
- Appliance repair that does not alter the gas, electrical or venting connection
Indiana licenses plumbing contractors and journeyman plumbers at state level. It issues no licence for electrical, HVAC or general contractors, so any registration for those trades is set by the city, town or county. Contractor licensing in Indiana
Rather not deal with the Lake County building department?
Get a free quote →How to apply for a Lake County building permit
The Plan Commission has no jurisdiction in the 18 incorporated cities and towns.
Indiana offers no plumbing reciprocity, and the county tests and licenses contractors.
Test against the statutory definition, not an impression of the building.
No construction on a Class 1 structure may start before it is issued (675 IAC 12-6-3).
The Plan Commission also handles unincorporated zoning, variances and special exceptions.
The county tests and licenses contractors; test dates are posted on the Plan Commission page.
A design release expires if work has not started within one year, with one extension of up to 180 days; the local permit runs on its own clock, so track both on Class 1 work. How long a design release lasts
Inspections in Lake County
Schedule inspections with the department that issued the permit. The local department sets the inspection stages; ask for its list when the permit is issued.
Do not cover work before the required inspection has been approved. On Class 1 work the design release must be posted on site and a complete set of the released plans kept there until occupancy (675 IAC 12-6-19).
Lake County permit search and official resources
Permit records for one project can sit in two places. The local department holds the building permit, the inspection history and the certificate of occupancy; IDHS holds the Construction Design Release file for Class 1 work, including releases issued by certified local units (IC 22-15-3-1). If you are buying, refinancing or renovating a commercial property, ask the Plan Commission, or the city or town department, what it holds for the parcel and establish separately whether a design release exists for the original construction and for any subsequent alteration.
Want this handled start to finish?
Get a free quote →Confirm the classification first, then the process. Whether a structure is Class 1 or Class 2 decides whether a state Construction Design Release is required, whether a design professional must be engaged, and which fees apply. Test it against IC 22-12-1-4 rather than against an impression of the building, and confirm current state and local requirements, fees and review turnaround for your filing date.
These are the primary sources behind this guide. Codes, fee schedules and portal procedures change. Confirm the position for your filing date.
- Lake County Plan Commission
- IDHS — building plan review process
- 675 IAC 12 — General Administrative Rules
- 675 IAC 12-6-3 — design release requirement
- 675 IAC 12-6-4 — exemptions from design release
Frequently asked questions
Can an Illinois-licensed contractor work here?
Not on an Illinois licence alone. Indiana offers no reciprocity for journeyman or contractor plumbers, and in unincorporated Lake County the Plan Commission tests and licenses contractors. Inside the cities and towns the local rule applies: Gary, for example, accepts a current licence from another municipality that requires a similar exam, once its Building Commissioner has verified it.
Is my project a Class 1 or a Class 2 structure?
Test it against IC 22-12-1-4. A Class 1 structure is one occupied or used in any part by the public, by three or more tenants, or by one or more persons acting as the employees of another. Class 2 covers one- and two-family dwellings and qualifying townhouses. A building used by even one person working as another’s employee is Class 1.
Inspections are where schedules slip.
Get a free quote →What is a Construction Design Release?
A state approval that must be issued before construction may be done on a Class 1 structure (675 IAC 12-6-3). It is issued by IDHS or by a city, town or county certified to issue releases (IC 22-15-3-1), and building a Class 1 structure without one is a Class C infraction (IC 22-15-3-7).
Who issues permits inside the cities and towns?
Not the county. The Lake County Plan Commission’s jurisdiction extends to unincorporated Lake County only, and it has none in incorporated areas, so ask the city or town.
Which contractor licences does Indiana issue?
The state licenses plumbing contractors and journeyman plumbers (IC 25-28.5). It issues no electrical, HVAC or general contractor licence; any registration or licensing for those trades is set by the city, town or county, which may also require licensed plumbing contractors to register locally (IC 25-28.5-1-33).
What does the state design release cost?
Under 675 IAC 12-3-2 it is a $75 filing fee plus a processing fee of at least $75, generally $0.050 per gross square foot for normal occupancy and $0.030 for warehouses, refrigerated storage, hangars and similar uses. Local permit fees are separate.
Simplify Lake County permitting with Alliance Permitting
In Lake County we first settle whether the parcel is unincorporated, then the classification and the contractor’s licence.
Trusted by leading builders, developers, and national contractors — 21+ years of filing in the jurisdictions we write about.
Contractors and builders choose Alliance for Lake County because the work is done by people who have stood at the counter:
- We confirm which department serves the parcel among many municipalities.
- We verify Indiana credentials on cross-border projects.
- We establish Class 1 or Class 2 and start the release early.
- We settle any zoning approval with the Plan Commission before filing.
- We confirm the contractor holds a county licence before filing.
Alliance Permitting is a permit documentation and submission company in Indiana. We prepare your paperwork, file it correctly and coordinate with the building department through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.
Ready to break ground in Lake County sooner?
Let Alliance prepare, file, and track your Lake County permits while your crew stays on the job.
More Indiana permitting guides
This guide is provided by Alliance Permitting for general information about Lake County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.