The project involved the extension of Building I of COS – Arcelor Mittal Steelworks in Dąbrowa Górnicza. The project consisted in adding another part to the complex of continuous steel casting buildings in which overhead travelling cranes can be repaired. On the northern side, a new gable wall was added on reinforced concrete foundations. As part of the project, the crane track is extended. The gross footprint area is 1,085.54 sq m, and the building is 44.5 m high at its highest point.