Open-cut excavation means digging a trench along the sewer line, removing the old pipe and laying new pipe on properly prepared bedding. It is the right method where a line has collapsed, where a belly has to be regraded, or where the existing pipe cannot host a liner or guide a bursting head. It also lets a cleanout or a new connection be added at the same time.
In the Las Vegas Valley, ground conditions drive the cost. Caliche, the cemented calcium-carbonate hardpan found across much of the valley, makes trenching slower and more expensive than digging in soft soil, and we say so plainly when a dig is needed. Caliche does not move pipe, but poorly compacted backfill settles over time and pulls a line out of grade, so careful bedding and compaction around the new pipe matter as much as the pipe itself.
Sewer line repair typically runs $1,500 to $5,000 in the valley, while open-cut replacement of a full line falls within the typical $4,000 to $12,000 range for replacement. Work is permitted through the building department for your address, done to the Southern Nevada Amendments to the Uniform Plumbing Code, inspected, and checked on camera before the trench is closed.