Yes, you can. You need to consider the condition of the existing tiles, the additional weight of the new tile and ensure you use the right adhesive. The existing tiles and grouting must be thoroughly cleaned, otherwise the adhesive will not bond. It is also recommended that you remove the glaze off the existing tiles with a sander or grinder for better adhesion.
We have a range of tiles to choose from and our tiling specialists are on hand to answer any questions