A steel building gets the name because steel is used for internal support with a steel frame and exterior steel cladding on a concrete or similarly unattractive structural building material.
These are two very different uses of steel (also called metal building).
Steel is an essential part of most modern building - even green buildings use steel for structural strength. Many amazing new designs with curves and odd shapes are only possibly because of advanced computer aided engineering (CAE) using steel.
Steel is often used for small practical or work buildings such as storage, office space and living space. Steel building kits are popular as it enables a fixed price quickly constructed building to be erected by a DIY or amateur builder. The competition for customers, and the recent cheapness of steel, has led to low prices.
Or small buildings can be pre-fabricated - they just need assembling onsite. This is popular for garages, sheds, store houses etc. and is the famous prefab building. Kits and prefabs are part of the same type of instant building.
Source: www.buildingdiy.com/building-steel-buildings.htm
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