On a daily level, we witness about the increasing destructive action of corrosion to surfaces of steel constructions, as an unintentionally harmful process. Today, steel constructions are built as simple as possible, but the surrounding environment has been increasingly aggressive. In order to ensure the safety of steel constructions, it is required not only to pay attention to the static security, but also to properly design them and apply the protection against corrosion. Inadequate selection of methods for protecting steel structures from corrosion can significantly affect human safety, but also unplanned costs. This thesis describes the most common reasons of occurrence of corrosion, as well as methods of protection against corrosion within a production company which is engaged in building of steel constructions for many years. In addition to the detailed description of protection of steel constructions by organic and inorganic coatings, this thesis also covers the constructional and technological measures which help to sooth the occurrence of corrosion.