Considering the frequent use of space truss structures to cover larger spaces with larger spans, where the self-weight represents a large share of the total load, a space truss structure was designed that can be used as a bus station, fair space and for similar purposes. The first part of the paper includes an overview of such structures and the reasons why aluminium is suitable for this type of structure. Within the review, the existing space truss steel structure was selected (at the border crossing Gradiška in Bosnia and Herzegovina). Thus, sufficient data was obtained for the mentioned construction and the calculation of aluminium and steel structure on that example was reproduced, according to current standards. Two models were made, steel and an aluminium version of the construction. The designing of the elements of each of the models was performed in the Scia Engineer 19.1 software package. A uniform percentage of utilization of elements between models was sought in order to better compare the basic costs of two versions of the same construction. The basic costs of both versions of the same construction have been calculated. The difference in the total price by 9 percent (aluminium construction is 9 percent more expensive), and all the above advantages of aluminium led to the conclusion that a justified solution would be to make a construction of this type in aluminium. It would be especially justified to do this in chemically aggressive environments because the maintenance costs are lower, so in the long run, the aluminium variant would be more costeffective. Furthermore, the execution of the structure is described and plans for the aluminium version of the structure prepared. Also, attention was made to the possible occurrence of contact corrosion on parts of the structure where aluminium and steel come into contact, and measures for its prevention were described.