Hi Fellas, 

I have a 40sqm bedrom with ~15y old tiling in it. To the best of my knowledge it's in great condition i.e. no bulging/breakage anywhere and it's straight. I would like to change the floor to a laminate. Would it be possible to put it on top of the current tiling? Any major downsides to this? 

Yes. and No. to your questions. The “no” depends on the installation.

 

A tile subfloor if in good condition is great for topping with just about any other finished surface...