Abstract: A building made of pre-fabricated parts, with a frame or skeleton structure, the pre-fabricated members being made of an aluminium or steel alloy and comprising substantially U-shaped base connector profile members for the connection of the skeleton structure to a foundation or a base plate, upright supporting pillars in the form of hollow profile members erected on the base connector profile members, girders supported by the supporting pillars and extending substantially parallel to the base connector profile members, connector elements and bolt fasteners for interconnecting these members, and suitable roofing, wall, door and window elements connected to the structure by fasteners or suitable attachment means. The various members may be dimensioned for various loads or span widths and/or are adapted to be reinforced so as to meet a wide range of requirements and specifications, in thus allowing one floor or multi-floor buildings to be erected.