To build a new bathroom, half-bath, shower unit, kitchen, or laundry room in your basement, you'll probably have to build a wet wall to enclose the pipes. This sounds like a formidable undertaking, but the work is not complicated, just heavy. In many homes, you will have to break out the concrete to expose the existing drain line. If drain stub ins are already in place, you won't have to remove the concrete.
You can save some money by tearing out the concrete with a sledgehammer (trim the edge neatly with a cold chisel), but you'll find a rented electric jackhammer well worth the expense. Be sure you have an easy way to remove the old concrete -- trash bags won't work.
When you install the drain lines, slope them for proper flow; a 1/4-inch drop per foot is standard, but check your local codes. They may require a steeper slope.
About 2 days to frame and plumb an 8-foot wall
Tape measure, chalk line, small sledgehammer and cold chisel, cordless drill, hammer, electric jackhammer or 12-pound sledgehammer, wheelbarrow, mixing hoe, level, reciprocating saw
Measuring and marking, breaking concrete, installing PVC and copper pipe
PVC and copper pipe, stakes, protective plates, 2x lumber, PVC primer and cement, concrete mix
Cement the fittings to the pipe with solvent cement, keeping the fitting aligned. Recheck for proper drain slope and place aggregate (such as crushed rock) around the line to hold it in position. After the line passes inspection from your local building department, backfill the trench with soil and concrete. Finish the concrete to match the floor.
Install shutoff valves on the supply lines closest to the new wet wall and extend copper supply lines to the wall. Install blocking or straps where necessary so the supply lines are supported properly, and tack protective plates where the lines pass through the studs. Plug the lines to keep construction debris out. Leave the wallcovering off until the building inspector has approved the installation.