Main Sewer Line Replacement: What You'll Pay and Why
Trenchless vs. open-trench pricing, what causes most main line failures, and how to read a sewer camera inspection.
A main sewer line replacement is one of the most expensive plumbing projects a homeowner can face, averaging $4,000–$12,000 nationally and easily topping $20,000 in markets with deep lines or heavy hardscape to demolish.
Trenchless options
Pipe bursting and CIPP (cured-in-place pipe) lining have become standard alternatives to open-trench replacement. They typically run 30–50% more per foot but save thousands on landscape, driveway, and sidewalk restoration.
Lining works only if the existing pipe still holds its shape. Bursting works on most pipe materials but needs two access pits and clearance around the existing line.
Why lines fail
Tree roots cause more sewer failures than any other factor, followed by clay or Orangeburg pipe simply reaching the end of its 50–60-year life. Cast iron from the 1950s–'70s is now failing in waves as the inside scales and pits through.
Any house built before 1980 should have a sewer camera inspection at purchase — it's $200–$400 and routinely identifies $10,000 problems.