A method for renovating a quay wall section by section, wherein use is made of a Z-shaped renovation element (1, 1', 1", 2) comprising: - a lip; - a main body, - a foot including one or more apertures (32, 33); and - one or more pile receiving elements (12, 13, 14, 27) associated with the main body and/or the lip; wherein the method, per quay wall section, comprises the steps of: - drilling through the quay wall on at least one position and in a substantially vertical direction, to obtain at least one drill hole extending through the quay wall; - providing at least one reinforcing pile; - placing the reinforcing pile in said drill hole, the reinforcing pile protruding with respect to the quay wall; - providing at least one supporting pile; - arranging the supporting pile in a waterway bottom, on a position in front of the quay wall section to be renovated, the supporting pile protruding with respect to the waterway bottom; - placing the Z-shaped renovation element (1, 1', 1", 2) against the quay wall, the at least one pile receiving element (12, 13, 14, 27) of the Z-shaped renovation element (1, 1', 1", 2) receiving the reinforcing pile protruding from the quay wall and the at least one aperture (32, 33) in the foot of the Z-shaped renovation element (1, 1', 1", 2) receiving the supporting pile protruding from the waterway bottom; and - fixating the Z-shaped renovation element (1, 1', 1", 2) with respect to the quay wall to obtain a renovated quay wall section, the lip of the Z-shaped renovation element (1, 1', 1", 2) forming an upper side of the renovated quay wall section and the foot of the Z-shaped renovation element (1, 1', 1", 2) extending away from the renovated quay wall section, into the waterway. - a lip; - a main body, - a foot including one or more apertures (32, 33); and - one or more pile receiving elements (12, 13, 14, 27) associated with the main body and/or the lip; - drilling through the quay wall on at least one position and in a substantially vertical direction, to obtain at least one drill hole extending through the quay wall; - providing at least one reinforcing pile; - placing the reinforcing pile in said drill hole, the reinforcing pile protruding with respect to the quay wall; - providing at least one supporting pile; - arranging the supporting pile in a waterway bottom, on a position in front of the quay wall section to be renovated, the supporting pile protruding with respect to the waterway bottom; - placing the Z-shaped renovation element (1, 1', 1", 2) against the quay wall, the at least one pile receiving element (12, 13, 14, 27) of the Z-shaped renovation element (1, 1', 1", 2) receiving the reinforcing pile protruding from the quay wall and the at least one aperture (32, 33) in the foot of the Z-shaped renovation element (1, 1', 1", 2) receiving the supporting pile protruding from the waterway bottom; and - fixating the Z-shaped renovation element (1, 1', 1", 2) with respect to the quay wall to obtain a renovated quay wall section, the lip of the Z-shaped renovation element (1, 1', 1", 2) forming an upper side of the renovated quay wall section and the foot of the Z-shaped renovation element (1, 1', 1", 2) extending away from the renovated quay wall section, into the waterway.