Engineer Saadallah Samih Geha established his office in 1967 in Zeydan building, Fakher El Din Street- Saida. He was responsible for engineering operations such as building design, architectural studies, structural studies, electrical studies, mechanical studies, obtaining building permits, pursuance, and supervision.
The office assumed multiple works in the technical field: restoration of buildings and old churches, design of schools and churches, supervision of constructions in Chouf, Saida, Jezzine, Tyre and Marjayoun, different engineering consultancy, cooperation with architects in Saida, studies of reinforced concrete tunnels and bridges, and the study of public waste water in some villages and towns.
In 1999, the office was transferred to Darb El Sim - Main Street. Between 1995 and 2007, engineers Samih Saadallah Geha and Samah Saadallah Geha participated in the office. In 2007, Samah Geha was assigned as the director, thus the work was oriented towards structural studies of big projects in Lebanon and abroad.
In 2007, the office started working with the French institutions ECOBA and ADS. It subcontracts the drawings of the formwork and reinforcement, as well as the structural designs.
BIG company was founded in 2000 in Jbeil as an office for studies and engineering consulting to be moved later (2010) to Greater Beirut Area, Lebanon (sister company).