This depends on the type of tile you are sticking over and the type of stick-on tile you are using.
However with the majority of modern stick-on tiles, the answer is yes. They can be stuck over normal tiles.
Large and thick stick on tiles
If you are using the more modern stick on tile. Which is thicker and larger than the standard stick on tile you shouldnt have any problems sticking them over tiles
Individual stick on tiles
As these are smaller and thinner. There can be issues with the tile depth being too thick. However this is usually in rare circumstances and they are normally fine to stick over tiles.
Things to do...
Whilst most stick-on tiles can be comfortably installed over existing tiles. There are some steps you should take to ensure a smooth installation.
- Make sure the surface of the previous tiles have been cleaned thoroughly.
- After this, its important to dry the tiles and wipe them down with a cloth. Any dirt that remains could result in an uneven finish or the adhesive being weakened