Holding Willix et Associés is a company specializing in various fields of activity related to construction, engineering and real estate. It operates on an international scale, subject to the necessary authorizations from the relevant authorities. The services offered by Holding Willix et associés include the planning, execution and control of surveyor-topographer activities, such as cartographic and topographic surveys for various types of buildings, plots and subdivisions. They also provide network engineering and general geotechnical services, carrying out geotechnical soil surveys prior to the construction of civil engineering structures.

In addition to this, Holding Willix et Associés carry out and supervise construction, building and civil engineering works, with an emphasis on reinforced concrete and public works projects. They also offer assistance, studies and advice in the field of building and civil engineering (BTP). The company is also involved in land engineering activities, such as property development, subdivision and urban planning. They also offer related services such as land procedures, cadastral surveys and land base management.