It is not essential to tile behind a wall hung bathroom vanity unit, but it is possible to do if that lines up with your personal preferences.
Many would-be renovators will prefer to begin upgrading their bathroom by first tiling the wall before adding a bathroom vanity unit to complete the look. This is the best approach to take if you are tiling behind the bathroom furniture, as it will not require you to proceed with invasive removal and re-attachment work in future.
If you would like a more detailed insight into all sorts of bathroom vanity design features, take a look at our Buyer’s Guide To Bathroom Vanity Units.