Once you have decided that you want to have a new bathroom the best way to save is to choose all the floor tiles and walls tiles yourself and once you have all the measurements for the required floor space and wall space for your new tiles it is a case of using the take-off measurements plus the 10% extra for wastage and then sourcing your new tiles.
Another area where you can save money on your bathroom renovation is to source all your fixtures and fittings you want from your taps, shower heads, towel rails including your new bathroom vanity & tapware as well.