The subject of this diploma thesis is design and check of two steel structures. A production hall with a floor plan dimensions 24x50 m and an administrative building with floor plan dimensions 54x30 m. Both buildings are situated in Prostějov. The structure of the production hall has a roof pitched at 12%. The main frames have 6 m centre to centre spacing. The design of the production hall is processed in two options. The administrative building has 4 floors. The floor structures are made of composite steel and concrete structure. The structure is stabilized by vertical bracings in both directions. The computational model of both structures was built up using SCIA Engineer software