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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!
This one: I want a new bathroom - what do I need to consider.
Interior: I want a new bathroom - please share references of other nice bathrooms
DIY: I'm fitting my new bathroom, what tile adhesive do I need
Homeowners: How much less can I get away with offering on this house because I don't like the bathroom