I want to install a toilet, shower and vanity on concrete floor. I have water but want to know the best way to proceed. Drill holes in concrete or build up the floor. This a steel building. This near the edge so I could dig under the slab.

I have an rv dump or sewer next to my building and will hook into that.

Thanks

Bob

If you build up the floor you'll have room for your drains but where will they drain to? Drill holes to where, you need to reach a main drain. I think you need to bust up the floor of the room and a trench all the way to an existing drain.