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Indiana Counties
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Overview
Indiana has NO mandatory statewide residential building code. Code adoption is entirely LOCAL - individual cities, towns, and counties choose whether to adopt codes and which editions. Class 1 structures (1-2 family dwellings) are locally regulated. Class 2 structures (commercial, multifamily 3+) regulated by state. Urban areas (Indianapolis, Fort Wayne, Evansville, South Bend) typically have IRC 2018/2021 with amendments. Many rural counties have LIMITED or NO code enforcement in unincorporated areas. EXCEPTION: Indiana Energy Conservation Code applies STATEWIDE (IECC-based with amendments) regardless of local building code adoption. Climate Zones: 4A (southern IN - Ohio River valley), 5A (northern/central IN - most of state). Ice barrier required STATEWIDE (Zones 4A/5A). Frost depth varies 24-42" (deeper in north, shallower in south). Snow loads 15-35 psf (lake effect in northwest increases to 30-35 psf). Karst terrain in southern IN (Monroe, Lawrence, Orange, Crawford counties) - sinkholes/caves. Mine subsidence in southwest coal region (Gibson, Pike, Warrick counties). Lake Michigan shoreline (Lake, Porter, LaPorte counties). Indianapolis/Marion County consolidated (Unigov). No statewide GC/roofing contractor license (local licensing varies). 92 counties.; Updated 2026-03: IN uses IRC 2018 statewide (was incorrectly marked custom)
Code Snapshot
Current editions in effect
Code
ASCE 2016
2016 Edition
Code
ASCE 7 2016
2016 Edition
Building Code
IBC 2021
2021 Edition
Energy
IECC-IN 2021
2021 Edition
Residential
IECC-R min.
min.
Fire Code
IFC 2021
2021 Edition
Effective Date: January 1, 2020
Verified: Mar 2026
Jurisdiction Complexity
Indiana is a MODERATE complexity state
Indiana applies state-level code amendments to ICC base codes, with some variation across local jurisdictions.
SimpleModerateComplex
Wind-Borne Debris
Varies by locality →Key Rules & Requirements
Critical regulations for Indiana restoration work
Southern Indiana has significant karst terrain requiring special construction considerations
Important: Southern Indiana, particularly Monroe, Lawrence, Orange, and Crawford counties, has extensive karst terrain characterized by limestone bedrock, sinkholes, caves, and underground streams. Construction in karst areas requires geotechnical investigation, proper foundation design, and careful stormwater management. Never direct stormwater into sinkholes. Setback requirements from sinkholes may apply. The Indiana Geological Survey provides karst maps and technical assistance.
Southwest Indiana has coal mining history with potential subsidence risks
Important: Southwest Indiana, particularly Gibson, Pike, Warrick, and portions of Vanderburgh counties, has historical coal mining operations that create potential subsidence risks. Underground mines can cause surface subsidence years after closure. Mine subsidence insurance is available through the Indiana government. Before construction in affected areas, check mine maps, consider foundation design for potential movement, and evaluate subsidence risk. The Indiana Geological Survey maintains mine maps and provides technical guidance.
Northwest Indiana experiences significant lake effect snow from Lake Michigan
Important: Northwest Indiana counties near Lake Michigan (Lake, Porter, LaPorte) experience lake effect snow that can significantly exceed typical snowfall amounts. This results in higher snow loads (25-35 psf vs 20-25 psf central Indiana), increased ice dam risk, and more frequent freeze-thaw cycles. Consider increased ice barrier coverage (36 inches), verify snow loads per ASCE 7, and design for heavy snow accumulation. Lake effect bands can produce localized heavy snowfall that may exceed design assumptions.
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Code Administration
Quick Statistics
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Jurisdictions
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ZIP Codes
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Special Zones
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Codes
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Climate Zones
Applicable Codes
Key Codes for Restoration Work
Primary codes for residential restoration projects in Indiana
| Code Type | Current Edition | Effective Date | Base Code | Status | Actions |
|---|---|---|---|---|---|
International Building Code 2021 Commercial & Multi-Family | IBC 2021 | Jan 1, 2022 | IBC 2021 w/ amendments | Current | View Details |
Indiana Energy Conservation Code Energy Efficiency Standards | IECC-IN 2021 | Jan 1, 2022 | IECC 2021 w/ amendments | Current | View Details |
International Energy Conservation Code (Residential) Single-Family & Townhomes | IECC-R min. | Jan 1, 2024 | IRC 2021 w/ amendments | Current | View Details |
International Residential Code 2021 Single-Family & Townhomes | IRC 2021 | Jan 1, 2022 | IRC 2021 w/ amendments | Current | View Details |
National Electrical Code 2020 (NFPA 70) Building Requirements | NEC 2020 | Jan 1, 2021 | NEC 2018 w/ amendments | Current | View Details |
International Building Code 2021
Commercial & Multi-Family
IBC 2021Details
Indiana Energy Conservation Code
Energy Efficiency Standards
IECC-IN 2021Details
International Energy Conservation Code (Residential)
Single-Family & Townhomes
IECC-R min.Details
International Residential Code 2021
Single-Family & Townhomes
IRC 2021Details
National Electrical Code 2020 (NFPA 70)
Building Requirements
NEC 2020Details
Effective dates reflect when each code edition was formally adopted by the state. Dates may differ across code types when amendments are adopted in separate rulemaking cycles. Base codes reference the ICC model code edition that serves as the foundation for the state's adopted version. Verify current applicability with your local Authority Having Jurisdiction (AHJ).
Get a jurisdiction-specific code packet
Enter a Indiana ZIP code for exact applicable codes, special zones, and a compliance checklist.
Special Zones
Special Zones
Flood & Coastal
FEMA Flood Zone AE - Indiana River Corridors
FEMA-designated Zone AE (Special Flood Hazard Area with established Base Flood Elevations) is present along major river corridors throughout Indiana. Primary flood zones along: Ohio River (entire southern border), Wabash River (western Indiana), White River (central Indiana including Indianapolis), Whitewater River (eastern Indiana), St. Joseph River (northern Indiana), Kankakee River (northwest), and numerous tributaries. Indiana participates in NFIP (National Flood Insurance Program).
Requirements: Local floodplain ordinance compliance required. Lowest floor elevated to or above BFE. Flood insurance mandatory for federally-backed mortgages in SFHA. Elevation Certificate required. Flood-resistant materials below BFE. Mechanical/electrical equipment above BFE. Flood openings (hydrostatic vents) in foundation walls if enclosed area below BFE. Indiana DNR floodway permit may be required for construction in regulatory floodway. No fill or construction in floodway without DNR approval. Substantial improvement (>50% market value) triggers full compliance.
View sourceSnow & Ice
IN Ice Barrier Zone (Statewide)
Ice barrier underlayment is REQUIRED statewide per Indiana Building Code (IRC R905.1.2). Indiana spans Climate Zones 4A (southern) and 5A (central/northern). Mean January temperatures range from 28°F (Evansville area) to 23°F (South Bend/lake effect zone). Indiana receives 25-70 inches of snow annually.
Requirements: Self-adhering polymer-modified bitumen sheet per ASTM D1970; 675 IAC 14 (Indiana Building Code), IRC R905.1.2, Climate Zones 4A/5A; Minimum 24 inches inside exterior wall line from eave edge
View sourceAdministrative
Indiana Energy Conservation Code (Statewide)
Indiana Energy Conservation Code applies statewide regardless of whether the local jurisdiction has adopted other building codes. Based on IECC with Indiana amendments. Applies to all new construction, additions, and some renovations. Climate Zones 4A (southern) and 5A (northern/central).
Requirements: IECC with Indiana amendments; State and local enforcement where adopted; Applies even where no local building code
View sourceWind & Hurricane
IN Tornado-Prone Region
State within or adjacent to the tornado corridor. NOAA SPC data confirms significant tornado frequency. Enhanced structural requirements apply per IRC R301.2.1.2.
Requirements: Enhanced roof-to-wall connections per IRC R802.11; Continuous load path from roof to foundation; Safe room construction per ICC 500/FEMA P-361 recommended; Garage door bracing for wind resistance
Geologic
Karst Terrain - Southern Indiana Multi-County Region
Karst terrain affects multiple counties in southern Indiana beyond the major karst counties listed separately. Additional counties with karst features include: Harrison, Washington, Martin, Greene, Owen, Jackson, and portions of others. Karst development varies from minor (occasional sinkholes) to major (extensive cave systems). The Mitchell Plateau, Crawford Upland, and Norman Upland are the primary karst physiographic regions.
Requirements: Check with Indiana Geological Survey for site-specific karst hazard assessment. Geotechnical investigation recommended in ALL southern Indiana counties before construction. Sinkholes can form or expand due to construction activities or changes in drainage. Proper stormwater management essential to prevent sinkhole formation. County ordinances may have karst-specific provisions.
View sourceClimate & Energy
Climate Zones
IECC Climate Zones in Indiana
4AMixed-Humid
Mixed-Humid
moist
5ACool-Humid
Zone 5A - Cool Humid
moist
Energy Code Requirements
IECC 2021 - Residential Insulation Minimums
| Component | Zone 4A | Zone 5A |
|---|---|---|
Ceiling Attic | 49.0 | 49.0 |
Wood Frame Wall | 20.0 | 20.0 |
Mass Wall | 13.0 | 17.0 |
Floor | 19.0 | 30.0 |
Basement Wall | 10.0 | 15.0 |
Slab Perimeter | 10.0 | 10.0 |
Crawl Space Wall | 10.0 | 15.0 |
Window | 0.320 | 0.300 |
Skylight | 0.550 | 0.550 |
Door | 0.350 | 0.350 |
Legend:
Ceiling Attic
Wood Frame Wall
Mass Wall
Floor
Basement Wall
Slab Perimeter
Crawl Space Wall
Window
Skylight
Door
NR = Not Required
Fenestration Requirements
U-Factor (Max)
0.320
SHGC (Max)
0.40
Ice Barrier
Required
R-Value Requirements (Zone 4A - Most Common)
R-49.0
Ceiling
Attic/Roof
R-20.0
Walls
Wood Frame
R-19.0
Floor
Over Uncond.
R-10.0
Basement
Wall
R-10.0
Slab
Perimeter
NR
Crawlspace
Not Required
Counties
Indiana Counties
92 jurisdictions with code information
Adams County
FIPS: 18001
Standard
7 ZIP codesView
Allen County
FIPS: 18003
Amendments
53 ZIP codesView
Bartholomew County
FIPS: 18005
Standard
10 ZIP codesView
Benton County
FIPS: 18007
Standard
6 ZIP codesView
Blackford County
FIPS: 18009
Standard
2 ZIP codesView
Boone County
FIPS: 18011
Standard
6 ZIP codesView
Brown County
FIPS: 18013
Standard
4 ZIP codesView
Carroll County
FIPS: 18015
Standard
9 ZIP codesView
Cass County
FIPS: 18017
Standard
10 ZIP codesView
Showing 9 of 92 jurisdictions.
Inspection Process
Inspection Process
Standard permit inspection sequence for Indiana residential projects
1
Footing Inspection
After excavation, forms, and reinforcement in place
2
Foundation/Basement Inspection
After foundation complete, before backfill
If applicable
3
Rough Framing Inspection
After framing complete, before insulation or covering
4
Roof Sheathing Inspection
After roof deck complete, before underlayment
Before roofing
5
Ice Barrier/Dry-In Inspection (CRITICAL for Indiana)
After ice barrier and underlayment installed, before final roofing material
6
Insulation/Energy Inspection
After insulation installed, before drywall
Energy code compliance
Final Inspection
After all work complete
CO Issued
Important Notes
24-Hour Notice: Schedule inspections at least 24 hours in advance.
Permit Card: Must be posted and visible from street.
Re-Inspection Fees
- First re-inspection
- Often free
- Second re-inspection
- $50-100
- Additional re-inspections
- Varies
* Fees vary by jurisdiction
Contacts & Resources
City of Evansville - Building Commission
State Building Code Authority
City of Indianapolis - Department of Business and Neighborhood Services
Indianapolis
City of Carmel - Building and Code Services
Carmel
City of Fishers - Building and Planning Department
Fishers
City of Fort Wayne - Development Services
Fort Wayne
City of South Bend - Building Department
South Bend
Contractor Licensing
Contractor licensing in Indiana is managed at the state level. Contact the state licensing board or visit your local building department for specific requirements and license verification.
Data last verified: February 2026 · Always verify requirements with the local building department.