In apartments, the bathroom is almost always small, and therefore it can be difficult to place plumbing in it. In addition to the bathtubs and the moo, there is a toilet in paired baths, and I would like to place a washing machine in this room, and not in the kitchen. For walls you need to choose a coating that will take the minimum of the space of the room. You can glue waterproof wallpaper or fiberglass wallpaper. Before you glue the walls or put the tiles on the floor, it is necessary to repair all the pipes, or replace them, if the plumbing is located in a new one, then you need to plan a wiring for it. In some cases, the installation of the toilet is separately with the washstand, but in this case there is no place for the washing machine.
Before buying a plumbing for a bath, measure its dimensions and calculate how much space it will take in the room, it is desirable that there is enough space for unhindered movement. If it turns out that the room will be very crowded, then it is worth choosing another plumbing for yourself, for example, replace the bathroom shower, and take the washbasin smaller. If the washing machine has nowhere to place as soon as in the bathroom, then you should think about dismantling the partition between the toilet and the bathroom. Put a drywall partition, it is thinner than ordinary walls and due to this a little space will increase. If possible, move the pipes close to the wall.