Should I tank my bathroom or build a wet room?

No complete waste of money

It's always best to tank a bathroom, that said, it is rarely ever done. Most bathrooms have a shower enclosure with an appropriate shower tray or bath. Providing the floor has been prepared adequately and tiled/floored using the appropriate materials, you should not need to tank the room. Therefore, reducing the cost. I hope this helps.

There is no need to tank a bathroom unless local conditions dictate requirement. However, when fitting a wet room the room will require the room to be fully tanked, floor to ceiling within the wet area and to a height of 600mm past the wet area. It would also require tanking to a height of 100mm minimum round the remainder of the room, with the floor fully tanked and waterproofed in the whole room area.

British standards say you should tank a bathroom and if you have a wetroom for sure as water stagnates! Yes it's more expensive but I wouldn't want to be paying someone to RIP all tiles up and do again trust me! Hope this helps mike