installing a shower
I have a 1/2 bath with a sink and a toilet which has a sliding door. Next to this bathroom is a step down into a foyer area. This used to be a garage that was converted into three rooms and a foyer area. I am going to take the wall out next to the bathroom and make the bathroom bigger and install a walk in shower. My problem is the step down. There is a 6" step down that has a concrete wall base. In the bathroom the sink is on this wall and the toilet is across from it. In the foyer area on the right side is another wall which is the closet of the adjoining room. This room is only used for storage so I am thinking about using the closet for the shower stall. And moving the sink to the outer wall next to the shower. I believe I can tie into the pluming from the sink. Here are my question. Can I tie into the sink plumbing? Should I build the floor up level to the bathroom floor and install the shower pan below the new floor or should I leave the floor as is? It is a concrete floor because it used to be the garage. If I build it up can I install all the plumbing underneath the new floor without braking into the concrete floor.