The cost varies by region and composition of earth to be excavated (rocks & roots can be extra). Generally the price of tunnel excavation for Plumbing repairs is slightly higher than an in home slab break repair, but the real benefit to tunneling is there is no inconvenience to the residents due to construction debris and intrusive mess associated with an in home "break".
Depending on who is paying the bill (homeowner, plumbing company, or insurance co.), the excavator can charge anywhere from $100 to $375+ per foot.
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