Move a toilet could be almost impossible. A larger drain with it's required drop may require not only the slab to be ripped up in the bathroom, but probably another 20 feet in another room ripped up. Just adding a true wall and door should be less than 5k. Otherwise, you could be up in the area of 20k plus. I shudder to think of replacing a 2" with a 4" pipe and the DWV that will be required per code.
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