What is the International Building Code (IBC)?
The International Building Code (IBC) is a model building code developed by the International Code Council (ICC) that serves as the basis for building regulations in most U.S. states and many countries. Jurisdictions adopt it with local amendments.
What to do first
The International Building Code (IBC) is a model building code developed by the International Code Council (ICC) that serves as the basis for building regulations in most U.S. states and many countries. Jurisdictions adopt it with local amendments.
Printable checklist
- Identify which code family applies to the building and occupancy.
- Confirm the edition and local adoption date rather than assuming the newest edition applies.
- Read local amendments alongside the model code.
- Check whether a separate residential, existing-building, energy, fire, plumbing, mechanical, or electrical code applies.
- Use the code edition enforced by the authority for the permit application date.
How this works in practice
The International Building Code (IBC) is the most widely adopted model building code in the United States and serves as the foundation for construction regulations across the country.
Key facts about the IBC
- Published by the International Code Council (ICC)
- Updated on a three-year cycle (2018, 2021, 2024, etc.)
- Adopted in all 50 states at some level (state or local)
- Covers commercial, industrial, and multi-family residential buildings
- Works alongside the International Residential Code (IRC) for one- and two-family dwellings
What the IBC covers
- Structural design requirements
- Fire and life safety
- Means of egress (exits and escape routes)
- Accessibility (ADA compliance)
- Interior environment (ventilation, lighting, sanitation)
- Building materials and methods
- Special occupancy requirements (hospitals, schools, high-rises)
Related codes in the International Code family
- International Residential Code (IRC): One- and two-family dwellings
- International Mechanical Code (IMC): HVAC and mechanical systems
- International Plumbing Code (IPC): Plumbing systems
- International Energy Conservation Code (IECC): Energy efficiency
- International Fire Code (IFC): Fire prevention and safety
- National Electrical Code (NEC/NFPA 70): Electrical systems
How jurisdictions use the IBC
- Most states adopt the IBC as their base building code
- Local jurisdictions may adopt additional amendments (more restrictive, not less)
- Some cities (like New York City and Chicago) maintain their own building codes
- The specific edition in effect varies by jurisdiction — always check which version your local authority enforces
Why it matters for your permit
- Your project plans must comply with the code edition adopted by your jurisdiction
- Plan reviewers and inspectors check your work against these standards
- Understanding the applicable code edition helps you prepare better applications
What an application can look like
These examples show how a project scope typically turns into an application packet. The issuing authority decides the exact forms, documents, and reviews for a property.
New single-family home
A new dwelling on a vacant or redevelopment parcel.
Construct a new two-story single-family dwelling with attached garage on a vacant residential parcel, including foundation, utilities, grading, structural, energy, electrical, plumbing, and mechanical work.
Typical application material
- Survey, site plan, grading/drainage information, and utility plan
- Complete architectural and structural drawings
- Energy-code documentation and equipment schedules
- Trade plans, contractor credentials, and other jurisdiction-specific forms
Likely review touchpoints
- Land-use, zoning, and site review
- Full building and trade plan review
- Multiple construction inspections and occupancy closeout
Home addition
A one-story conditioned addition connected to an existing house.
Construct a 14 ft × 20 ft one-story conditioned rear addition containing a family room; extend the existing foundation, framing, electrical, HVAC, and roofing systems; no new plumbing fixtures.
Typical application material
- Survey or site plan with the proposed footprint
- Architectural floor plans and elevations
- Foundation, framing, and structural details
- Energy, electrical, plumbing, and HVAC information as applicable
Likely review touchpoints
- Zoning and site constraints before plan review
- Building, energy, and trade-code review
- Foundation, rough-in, framing, insulation, and final inspections
Change of use / occupancy
Converting an existing space to a materially different use.
Convert an existing ground-floor retail tenant space to a small restaurant, including kitchen equipment, plumbing, ventilation, accessibility updates, occupant-load review, and life-safety modifications.
Typical application material
- Existing and proposed use and occupant-load information
- Floor plan showing exits, accessibility, and life-safety features
- Building-system changes needed for the new use
- Zoning or land-use application if the new use needs separate approval
Likely review touchpoints
- Zoning/use authorization
- Building, fire, accessibility, and systems review
- Final inspection and occupancy documentation where required
Median application-to-issue interval 9 days; median recorded fee $2,006.28.
Median application-to-issue interval 7 days in the loaded Chicago corpus.
Recorded structural-repair permits in the loaded Chicago corpus; median recorded fee $500.
Active City of Chicago permits currently in the GovCodex Illinois permit corpus.
Snapshot checked September 28, 2026. GovCodex Illinois permit data currently reflects 842,269 active City of Chicago permit records loaded from the City of Chicago dataset, with issue dates from January 3, 2006 through July 24, 2026. Historical counts, elapsed time, and recorded fees describe observed permits only. They do not determine whether a permit is required, predict approval, or replace the issuing authority’s current rules and fee schedule.
What else to know
The IBC is a model code
The International Building Code is published by the International Code Council and becomes enforceable only through adoption by a state or local authority. Jurisdictions can adopt different editions and amendments, so the cover of the model code is not enough to establish the rule for a property.
Residential projects may use a different code path
Detached one- and two-family dwellings and townhouses are often governed by a residential code or state residential program rather than the IBC itself. Mixed-use, multifamily, commercial, and certain existing-building projects can follow different code families.
Check the actual project against the actual property.
Start with the address and scope. GovCodex will identify the relevant authority, requirements, and permit path for the project.
GovCodex
What is the International Building Code (IBC)?
The International Building Code (IBC) is a model building code developed by the International Code Council (ICC) that serves as the basis for building regulations in most U.S. states and many countries. Jurisdictions adopt it with local amendments.
Code-version checklist
- Identify which code family applies to the building and occupancy.
- Confirm the edition and local adoption date rather than assuming the newest edition applies.
- Read local amendments alongside the model code.
- Check whether a separate residential, existing-building, energy, fire, plumbing, mechanical, or electrical code applies.
- Use the code edition enforced by the authority for the permit application date.
Requirements vary by property and jurisdiction. Verify the current issuing authority, permit path, fee schedule, and inspection requirements before starting work.
govcodex.com/answers/what-is-ibc