average cost to repair underground water pipe outside of house
For less accessible burst pipes, such as underground or inside a wall, it can cost $400-$1,500 or more, depending on how much work it takes to uncover the burst pipe and if the work is done on an emergency basis. A Denver plumber estimates fixing hundreds of burst pipes in one winter, with an average bill of $900. If the leak is under a concrete slab foundation, just repairing the pipe can cost $500-$3,800 or more; see How Much Does a Slab Leak Cost.