A tile spacer and levelling system comprising: (a) a tile spacer comprising a base for engaging a bottom surface of each of four adjacent tiles to be spaced and levelled and a stem projecting upward from the base, the stem comprising a tile alignment portion having a cross-shaped profile, a frangible portion located between the base and the tile alignment portion, a plurality of teeth located above the tile alignment portion, and one or more ribs located at or above the top of the plurality of teeth; (b) a tile leveller for engaging a top surface of the four adjacent tiles, the tile leveller comprising an aperture for receiving the stem of the tile spacer, a ratchet mechanism such that the tile leveller is restricted to only move downward along the stem toward the base, a stem engaging portion comprising one or more projections for engaging with the plurality of teeth of the stem, wherein at least one of the projections and teeth are resilient and orientated to allow one way movement of the stem with respect to the stem engaging portion; and (c) a levelling hand tool comprising a stem receiving portion comprising a pair of laterally movable opposed grips for engaging and gripping said one or more ribs of the stem, a tile leveller engaging portion, a trigger, and a trigger mechanism; wherein, in use, the tile spacer is located at the intersection of the four adjacent tiles such that the base is located beneath the four adjacent tiles, and each tile abuts a corner of the alignment portion so as to space the four adjacent tiles at a predetermined distance with respect to each other; wherein, in use, the four adjacent tiles are levelled by applying a clamping force on the four adjacent tiles between the base and the tile leveller, to simultaneously level the four adjacent tiles; and wherein, in use, actuating the trigger causes the stem receiving portion to be pulled inward with respect to the tile leveller engaging portion so that the pair of laterally movable opposed grips engage and grip said one or more ribs of the stem and cause application of the clamping force and levelling of the tiles. (a) a tile spacer comprising a base for engaging a bottom surface of each of four adjacent tiles to be spaced and levelled and a stem projecting upward from the base, the stem comprising a tile alignment portion having a cross-shaped profile, a frangible portion located between the base and the tile alignment portion, a plurality of teeth located above the tile alignment portion, and one or more ribs located at or above the top of the plurality of teeth; (b) a tile leveller for engaging a top surface of the four adjacent tiles, the tile leveller comprising an aperture for receiving the stem of the tile spacer, a ratchet mechanism such that the tile leveller is restricted to only move downward along the stem toward the base, a stem engaging portion comprising one or more projections for engaging with the plurality of teeth of the stem, wherein at least one of the projections and teeth are resilient and orientated to allow one way movement of the stem with respect to the stem engaging portion; and (c) a levelling hand tool comprising a stem receiving portion comprising a pair of laterally movable opposed grips for engaging and gripping said one or more ribs of the stem, a tile leveller engaging portion, a trigger, and a trigger mechanism;