Moving a toilet is not the same as replacing a toilet. Replacing swaps the unit on the same drain -- $150-$400 with a plumber. Moving means rerouting the drain pipe to a new location, which involves cutting into the floor, running new pipe at the correct slope, tying into the main drain, and passing inspection. The toilet itself is the cheap part. The plumbing work underneath is where the money goes. Here is what drives the cost and what to expect.