Omw guys firstly not a HE...lol
Yes I do own the apartment, only recent moved out on my own.
I'm part of the body corporate, only 4 flats here so I doubt I'll have trouble asking. Just wanted to know if any legal shizz needs to happen
Its good manners to let the body corporate know as the rules might state what needs to happen to rubble and the times the renovations can happen in. For putting in a bath there shouldnt be any legal requirements (that I know off) you only need to get permissions from the body corporate/users and maybe the municipality if you start breaking walls, adding walls (if above a certain height it needs to go municipality) etc. Hopefully the piping for the bath would be in place or easy to add, if the pipe modifications extend to the outside just chat to the body corporate too.