i wish to build a toilet under the staircaseand put in a wash basin . the old toilet is 10 feet away in the next room. how do i do this, the room under the stairs is big enough, but dont know what materials i would need..ie partion wall or normal plaster board secured on to stairwell etc.. please someone help me. i beleive i would need to dig up the concrete from the old waste pipe? am i right or not..
what materials would i need..