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A building code is a set of laws that specify how buildings should be constructed. This is generally considered the minimum acceptable level of safety for a new building in a jurisdiction. Building codes are generally intended to be applied by architects and engineers. There is often other codes or sections of the building code that have more prescriptive requirements that apply to housing (one and two family dwellings).
In some countries the building codes are National Codes and apply across the country. In other countries the laws are adopted at a municipal or subnational entities level. In these cases a model building code system is usually used. In other cases jurisdictions may adopt national or model codes from other jurisdiction. For example in the United States local governing bodies such as counties or cities often include the National Electrical Code in their local building codes by reference along with any local differences. Because of copyright law one most obtain both the local codes and any model codes they adopt separately.
Building codes generally include:
 Structural safety: buildings should be strong enough to resist internally and externally applied forces without collapsing;
Fire safety: includes requirements to prevent the fire spread to/from neighbours, provide warning of occupants, and safe exiting of building, limitation on fire spread, and provisions for fire suppression/fire fighting;
Health requirements: adequate washrooms, adequate air circulation, and plumbing materials.
Some building codes include requirements for:
Accessibility: requirements to ensure that a building is accessible for persons in wheelchairs or having other disabilities.
Building codes generally do not include:
Aesthetics: Any regulation of the aesthetics of buildings are usually included in zoning by-laws;
Traffic convenience: Limitations on traffic flow are usually either in zoning or other municipal laws.
Building Use: the safe use of a building is generally in the Fire Code
Required upgrades for existing building: unless the building is being renovated the building code usually does not apply.
Building codes can also include:
Specifications on components;
Allowable installation methodologies;
Minimum and maximum room and exit sizes and location;
Qualification of individuals or corporations doing the work.
For high structures of all kinds, it must be considered that it can be an obstacle for aircraft and must therefore often marked for aircraft.
These requirements are usually a combination of prescriptive requirements that spell out exactly how something is to be done, and performance requirements which just outline what the required level of performance is and leave it up to the designer how this is achieved. Historically they are very reactive in that when a problem occurs the building codes change to ensure that the problem never happens again. In recent years there has been a move amongst most of the building codes to move to more performance requirements and less prescriptive requirements.
Traditionally building codes were generally long complex interrelated sets of rules. They generally included reference to hundreds of other codes, standards and guidelines that specify the details of the component or system design, specify testing requirements for components, or outline good engineering practice. These detailed codes required a great deal of specialization to interpret, and also greatly constrained change and innovation in building design. In recent years several countries, beginning with Australia, have moved to much shorter objective based buildings codes. Rather than prescribing specific details, objective codes lists a series of objectives all buildings must meet while leaving open how these objectives will be met. When applying for a building permit the designers must demonstrate how they meet each objective. |
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