Ray Trueman
Hello when we do a bathroom the process is remove old suite and make good all walls first fix the pipe work for the new toilet, basin and install the bath then the tiler tiles the whole bathroom and the plumber returns to install wc and basin allowing them to be fitted on top of the tiles. If you only have one wc in the property the new wc can be fitted loose without the cistern and be flushed with a bucket whirl the tiler is doing the floor usually only 1 day hope this helps cheers Ray Trueman plumbing heating & gas