Modern steel module construction integrates environment protection and energy efficiency to create sustainable buildings. Targeting to keep the environmental impacts on buildings as low as possible and to optimise user comfort, modular construction makes a valuable contribution for creating “smart” buildings. Effective prefabrication, clean and quiet installation as well as flexible structures ensure the long-term preservation of the value of modular buildings. Furthermore, displaceability and 100% recyclability of the main material being steel ensure relief of the natural resources of the earth, saving the environment.