A method of raising a building structure (1) with respect to the ground (2); the method including the steps of: forming a mat (7) having a number of through holes (12), each surrounded by a number of upward-projecting ties (16); inserting a foundation pile (9) through each hole (12); attaching to each foundation pile (9) a lifting device (11), which on one side rests on the top end of the foundation pile (9), and on the other side is secured to the corresponding ties (16) which act as reaction members; exerting thrust on the foundation piles (9) by means of the lifting devices (11) to lift the building structure (1) with respect to the ground (2); dividing lift of the building structure (1) into a succession of lift steps; establishing a predetermined lift value for each lift step; and, at each lift step, operating each lifting device (11) to expand the lifting device (11) by exactly the predetermined lift step value.