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Standards Development
This British Standard establishes a classification system for building systems and elements used in permanent buildings.
It specifies the classification hierarchy, the criteria for assigning a system or element to each class, the format of the classification code, and the descriptors used for material and connection type. It also specifies how element classifications combine to classify a whole building.
It covers system in categories 1 to 5 of the MMC Definition Framework: volumetric, panelised and linear component systems forming primary structure; non-structural volumetric units such as bathroom and kitchen pods; enclosure and infill systems; and pre-assembled services modules. The hierarchy follows the principles of ISO 22274 and uses terms consistent with BS ISO 6707-1.
It does not specify design rules, performance requirements, test methods or dimensional coordination. It does not cover site process improvements (categories 6 and 7 of the framework) or temporary buildings.
There is no agreed, rule-based way to describe which construction methods were used when constructing a building. Whilst some systems exist within the sector, they either lack the rules required to consistently identify methodologies or focus on ‘what’ an object is, rather than ‘how’ its realized.
As a result, building control bodies, warranty providers, insurers, lenders and valuers each describe MMC in their own terms and ask for different evidence on the same type of system. Non-traditional buildings are often treated as high risk by default, which adds cost and slows adoption.
A common classification will let these organizations, along with clients, designers and manufacturers, compare like with like and apply consistent evidence requirements to each methodology class. A common classification will also provide digital tools and asset records with a consistent identifier. International work on classifying prefabricated buildings in ISO/TC 59/SC 19 is still at an early stage. This standard will give the UK a methodology classification which may support a future international classification system.
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