Doing renovation on bathroom specially condo, is a very costly job, which not only related to how much u hack and how much u lay. Is also u have to remove all the bathroom accessories & fitting, and re-install, water proofing for bathroom (which have to be done), and most of the time removing tile will effected water piping, so have to re-touch up on piping. so, there is a lot of cost to include. so, that depent on site but cant counting by sf.