The National Bardo Museum underwent a major project consisting of two main components carried out in parallel: the restructuring of its original premises and the construction of a significant extension. The extension works included an underground structure, a ground floor, a mezzanine, and two upper floors, with a total covered surface area of approximately 8,400 m² and ceiling heights varying from 2.80 m to 17.20 m. The structure is made of reinforced concrete, and all floor slabs are solid, ranging in thickness from 15 to 35 cm.