In this diploma thesis, the design of the steel structure was conducted, which is intended as a cottage, ie a holiday home. It is located in the area of Trget which is located in the Istria County at an altitude of 100 meters above sea level. The building with a rectangular floor plan, a total of 54 m2, is located in a rock notch. The slope of the single-pitched roof of the building is 5 °, so it is designed as a flat roof. The structure is dimensioned for constant and variable loads from wind and snow acting on the roof structure and vertical walls. The analysis was performed according to European Standards and National Annexes using the Dlubal RFEM software package. The load-bearing capacity of the joints was checked in the IDEA StatiCa program. The joints are made in a screw version. Performance drawings with material statements were made using Autodesk Advance Steel. Special attention is paid to the design of the structure in order to make the best use of the characteristics of each part of the structure. Two variants of the main beam in the version with IPN and HEA profiles, two variants of the mezzanine construction in the version with a composite panel and grill system and two variants of the facade girders in the version with UPN and IPN profiles were considered. A comparison of the steel construction of the cottage with the cottage in the classic design was performed. Given the price of material consumption, the cottage in the classic design is more economical.