Having just removed tiles from a fully tiled bathroom, I'd say tile over if you can.
a) removing them is a massive pain, hugely time-consuming, noisy and dusty. I had 3 or 4 trips to the tip with many, many rubble sacks.
b) we then had to have it boarded out / replastered because the existing plasterboard/plaster beneath was trashed.
c) then I was able to tile.
You may be lucky and the tiles come off cleanly, but equally it might well be a shit show afterwards!
I'm now planning the process of getting the bathroom now. If I get the bathroom reskimmed the plan is to tile straight on it. Can I deal the bath and sink to the wall before tiling to offer that double seal protection?
Just ruling out having to dot and dab moisture boards etc
Having just removed tiles from a fully tiled bathroom, I'd say tile over if you can.
a) removing them is a massive pain, hugely time-consuming, noisy and dusty. I had 3 or 4 trips to the tip with many, many rubble sacks.
b) we then had to have it boarded out / replastered because the existing plasterboard/plaster beneath was trashed.
c) then I was able to tile.
You may be lucky and the tiles come off cleanly, but equally it might well be a shit show afterwards!