International Building Code (IBC)
Building codes are regulations that set out the standards to which buildings and other structures must conform. The International Building Code (IBC) is one of the codes established in the US by the International Code Council (ICC) and is applied by most of the country’s jurisdictions as well as internationally, although it can be amended to reflect local conditions and legislation.
IBC can be applied to most types of new buildings and is intended to ensure efficient and flexible building designs that protect health and safety and encourage the use of technological advances.
It requires that buildings and structures are classified under two categories:
- Use and occupancy.
- Type of construction.
Under use and occupancy there are several groups and subgroups that define a building’s specific use and are numbered based on the perceived risk the building poses to its occupants (the lower the number, the higher the risk). They are defined as follows:
OCCUPANCY GROUP | SUBGROUPS | USES |
Assembly |
A-1 (theatres, halls for performing arts) A-2 (restaurants) A-3 (worship and other recreation) A-4 (indoor arena) A-5 (stadiums) |
Places used for people gathering. |
Business | B | Places used for providing services (e.g. banks, government buildings, police stations, offices). |
Educational | E | Schools and day care centres. |
Factory | F1 and F2 | Places used for manufacturing, packaging, repairing, etc. |
High Hazard | H-1, H-2, H-3, H-4, and H-5 | Places involving hazardous materials (production, storage, etc.). |
Institutional | I-1, I-2, I-3, and I-4 | Places where people are unable to leave without assistance (e.g. hospitals, care homes, prisons), |
Mercantile | M | Commercial (e.g. shops, department stores, etc.). |
Residential | R-1, R-2, R-3, and R-4 | Places providing overnight accommodation (e.g. houses, hotels, apartments, hostels, etc.). |
Storage | S-1 and S-2 | Places where things are stored (e.g. warehouses, car parks, garages, etc.). |
Utility and miscellaneous | U | Accessory structures and others (e.g. towers, barns, cooling towers, stables, tanks, retaining walls, etc.). |
Buildings can also be classified as a mixed occupancy type if they are occupied by more than one group type, and the different parts must conform to the codes for those areas. For example, a shopping centre with an underground car park will need to conform to both Group M and Group S.
The type of construction identifies the type of materials utilised for constructing the building or structure and classifies the level of combustibility and fire resistance associated with its elements (including primary structural frame, exterior and interior load-bearing and non-load-bearing walls, floor and roof). These are categorised as follows:
- Types I and II: Building elements are made of noncombustible materials.
- Type III: Exterior walls are made of noncombustible materials, the interior elements are made of any permissible material.
- Type IV: Exterior walls are made of noncombustible materials, interior elements are made of, or incorporate, timber.
- Type V: Structural elements comprise any permissible materials (A: Fire-resistance rated construction. B: Non fire-resistance rated construction).
[edit] Related articles on Designing Buildings Wiki
- Building codes.
- Building inspector.
- Building official.
- Building regulations.
- Code of practice.
- Design review.
- Certificate of occupancy.
- International Code Council ICC.
- International Existing Building Code (IEBC).
- International Residential Code (IRC).
- International Zoning Code (IZC).
- Licensed contractors in the USA.
- Performance specification.
- Planning permission.
- Office of Construction Services.
- Structural engineering codes.
- The role of codes, standards and approvals in delivering fire safety.
- What approvals are needed before construction begins.
- Zoning in the United States.
Featured articles and news
Humidity resilience strategies for home design
Frequency of extreme humidity events is increasing.
National Apprenticeship Week 2025
Skills for life : 10-16 February
Update on the future of Grenfell Tower
Deputy Prime Minister decides for it be carefully taken down to the ground.
Ending decades of frustration, misinformation and distrust.
Essential tools in managing historically significant landscapes.
Classroom electrician courses a 'waste of money'
Say experts from the Electrical Contractors’ Association.
Wellbeing in Buildings TG 10/2025
BSRIA topic guide updates.
With brief background and WELL v2™.
From studies, to books to a new project, with founder Emma Walshaw.
Types of drawings for building design
Still one of the most popular articles the A-Z of drawings.
Who, or What Does the Building Safety Act Apply To?
From compliance to competence in brief.
The remarkable story of a Highland architect.
Commissioning Responsibilities Framework BG 88/2025
BSRIA guidance on establishing clear roles and responsibilities for commissioning tasks.
An architectural movement to love or hate.
Don’t take British stone for granted
It won’t survive on supplying the heritage sector alone.
The Constructing Excellence Value Toolkit
Driving value-based decision making in construction.