A tile setting assembly is made up of a panel which spans at least two pillars of a building and has a plurality of spaced parallel projections on one surface, and a plurality of holding members which are secured to the panel while abutting against the projections. Each holding member has opposed and spaced engaging portions for holding tiles. The holding members are made up of first holding members which are secured to the panel projections for holding a first set of elongated straight tiles which are secured to the major part of the panel with the exception of the opposite ends of the panel, and second holding members which are secured to the panel at the opposite ends of the panel for holding a second set of L-shaped tiles at the corners of a tiled wall which is to be built. A tiled wall is made up of the above-described components of the tile setting assembly with mortar filled in at the joint spaces between the adjacent tiles. The components of the above-described tile setting assembly being used in a new method of building tiled walls.