Abstract: A molded shower surround includes a base portion which receives wall portions and a corner portion therebetween. The corner portion includes an upper lock tab and a lower lock tab adjacent an outer edge. An upper lock slot and a lower lock slot are located adjacent the inner edge of each wall portions which engage the corner portion. Each side of the corner portion includes a corner flange arranged substantially perpendicular to a corner planar surface. The corner flange and the molded slots when combined with the upper lock tab and the lower lock tab which respectively engage the upper lock slot and the lower lock slot, provide a watertight interlocking arrangement between the corner portion and the wall portions. In one assembly method, the corner portion and a wall portion are locked into a sub-assembly then this sub-assembly is lifted and slide onto to a second wall which may already be mounted to the base portion.