An objective function used at the structural optimization should be formulated in such way that the most economic solution can be found. However, the objective function is usually simplified to represent the weight of the structure, disregarding the fabrication and erection costs of the structure. The aim of the paper is to present the developed objective function as a cost function dealing with the self-manufacturing costs of the whole structure. The cost function includes all essential fabrication and erection activities. It is formulated in an open manner, offering users the possibility to define their own parameters on the basis of a certain production line. The cost function is implemented into the optimization system for planar steel frames.
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