A tile levelling device (10) includes a base portion (12) having an upper surface (14) and an opposing lower surface (16), the lower surface (16) being substantially planar; two stems (20) each having a proximal end frangibly connected to the base portion (120) and a distal end connected to a body (32), a generally rectangular hole (34) being defined by the stems (20) the base portion upper surface (14) and the body (32), the hole (34) being adapted to receive a wedge (50); and a stiffening formation (70) located at or near the interface between each stem (20) and the body (32).