A new sewer line without a trench through the yard

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Traditional sewer replacement means a trench from the house to the street, through whatever lawn, driveway, or landscaping sits on top. Trenchless methods replace or reline the pipe through one or two small access pits instead.

What are the two ways?

• Pipe bursting: a new pipe gets pulled through the old one, breaking it outward into the soil. Works when the line is collapsed or undersized
• CIPP lining: a resin sleeve gets cured inside the existing pipe, a new pipe inside the old one. Works when the host pipe still holds its shape

The scope footage decides which fits. A collapsed or badly bellied line can't take a liner; an intact-but-leaky clay line is the classic lining candidate.

Why does it matter here?

In Seattle the homeowner owns the side sewer to the main, and a lot of those laterals run under driveways, mature landscaping, or sidewalk strips. Trenching that out is the expensive part. The clay and concrete laterals under the county's older neighborhoods are exactly the pipes trenchless was invented for, and the wetter the season, the more a failed lateral lets groundwater in and sewage out.

What does it cost?

More per foot than open trenching, less once you price what the trench would have destroyed. The real number depends on length, depth, how many bends in the line, and surface conditions. Any legitimate quote starts with a camera scope, a contractor who prices a replacement without scoping it first is guessing on your dime.