Water is leaking up through the grout of my kitchen floor when I stand in a certain place. My plumber tested and said it wasn't the water pipes, it is the drain pipes. A camera sent through the pipes showed massive corrosion and even holes (the house was built in 1964 and has cast-iron pipes in the slab). He said that he'd need to dig a trench from my garage (where washing machine and water heater live), through my kitchen, across my entryway, and into a closet that connects to the bathtub drain and replace all of the pipes with new (abandoning the original pipe line). This would cost over $7,000 and not include the cost of replacing the tile and any other repairs needed (except filling in the trench).
Someone else told me that it could be done with most of the digging outside the house to route the new pipes that way. And he could do it for around $4500. But this is a handyman (with plumbing experience) and a plumber who works at a local Home Depot. The first plumber belongs to a company that has done work for me in the past, and who I trust to do it right and well (anyone remember my mainline drain repair that set me back $8,000 not that long ago?).