The core activity of DIFER Construction Sàrl encompasses various works in the construction industry, particularly: masonry works (excavation, wall creation, staircase construction, demolition, renovation, etc.); civil engineering works (construction of network infrastructure, creation of chambers, excavations, opening and laying of SIN pipes, etc.); and renovation works (demolition, removal and installation of coatings, painting, peripheral insulation, etc.). Overall, the company's core activity can be described as construction and renovation services.