How many ceramic tiles should I order?

Before proceeding with the purchase of any amount of ceramic tiles (e.g. to cover a bathroom or a kitchen and a living room), it is necessary to know the area of the surface to be tiled, and establish the tiling technique and pattern.
Some 10-15% extra tiles should be ordered than are actually required for the surface in one delivery (in order to avoid different batches of tiles). This is because

  • up to 5% of the tiles in a Top Quality batch can be defective;
  • some tiles must be cut or drilled, which means that a certain number will have to be discarded;
  • after tiling, some tiles should be saved for any future repairs;
  • it is also important to have a sample to show the customer should they have complaints concerning the tiles.