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In structural engineering, a Pre-Engineered Building (PEB) is constructed using a pre-determined inventory of raw materials that can satisfy a wide range of structural and aesthetic design requirements.

Historically, the primary framing structure of a Pre-Engineered Building is an assembly of I shaped members, often referred as I beams. In Pre-Engineered Buildings, the I beams used are usually formed by welding together steel plates to form the I section. The I beams are then bolted together to form the entire frame of the Pre-Engineered Building. Some manufacturers taper the framing members (varying in web depth) according to the local loading effects. Larger plate dimensions are used in areas of higher load effects.

Other forms of primary framing include trusses. Typically, primary frames are 2D type frames (i.e. may be analysed using 2D techniques).

Cold formed Z and C shaped secondary structural members form the secondary structural members acting as supporting system for the external clading. Roll formed profiled sheeting may be used for the external cladding of the building.

In order to accurately design a Pre-Engineered Building, engineers consider the clear span between bearing points, bay spacing, roof slope, live loads, dead loads, collateral loads, wind uplift, deflection criteria, internal crane system and maximum practical size of fabricated members. Many Pre-Engineered Building manufacturers have pre-calculated tables for different elements in order to allow designers to select the most efficient I beams size for their projects.

While Pre-Engineered Buildings can be adapted to suit a wide variety of structural applications, the greatest economy will be realized when utilizing standard details. An efficiently designed Pre-Engineered Building can be lighter that the conventional steel buildings by up to 30%.

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