Trenchless or Dig? What Actually Decides How Your Sewer Line Gets Fixed

Author : Sewer line Repair | Published On : 22 Oct 2026

When a homeowner is told their sewer lateral needs work, the first question is usually about the lawn. Will the yard be torn open, or can this be done without a trench?

It is a fair question, and the honest answer is that the homeowner rarely gets to choose. The pipe decides. Here is what each method actually does, and the conditions that rule one of them out.

Cured-in-place lining

A resin-saturated felt liner is pulled or inverted into the existing pipe, then cured until it hardens. The result is a continuous new pipe formed inside the old one, with no joints along its length. Since roots enter clay pipe at the joints rather than through the pipe wall, removing the joints removes the entry points.

Lining needs one thing above all: the host pipe has to still be there. The liner uses the old pipe as its mould. If a section has collapsed, there is nothing to form against, and lining is off the table for that run.

Two other limits are worth knowing. Lining slightly reduces the internal diameter, which is usually irrelevant on a residential lateral but occasionally matters. And every branch connection along the lined section has to be reopened afterwards with a cutter, because the liner seals across them.

Pipe bursting

A bursting head is winched through the old pipe. It fractures the existing line outward into the surrounding soil while pulling a new HDPE pipe in behind it. The old pipe is not removed; it is pushed aside.

This works where lining does not, including on lines that have already failed structurally, and it allows upsizing to a larger diameter. It needs an access pit at each end rather than a full trench, so the disruption is two holes instead of an open cut.

The constraint is what sits around the pipe. Fracturing a line outward displaces soil, so other utilities running close alongside, or certain soil conditions, can rule it out.

Open-cut replacement

The traditional method: trench the length of the line, remove the old pipe, lay new, backfill.

It gets dismissed as outdated, which is unfair. There are situations where it is the only method that actually solves the problem.

The clearest one is grade. If a line has a belly — a low section where the ground settled unevenly — the pipe no longer runs downhill consistently and solids collect in the dip. Lining will not fix this. A liner follows the existing pipe exactly, so a lined belly is still a belly, now with a smooth new surface. Correcting grade means lifting and relaying the pipe, which means digging.

Open-cut is also the answer when the line is badly misaligned, when the route has to change, or when a full collapse runs long enough that bursting cannot be set up cleanly.

What this means before you agree to anything

Every one of these decisions depends on information that can only come from inside the pipe. Whether the host pipe is intact. Whether there is a belly, and where. What the line is made of. How long the damaged section actually runs.

A camera inspection answers all of that, and it takes under an hour. Any quote given without one is a guess, and that guess tends to land on the more expensive method because it is the safer option for whoever is quoting.

Ask to watch the screen while the scope runs, and ask for a copy of the footage afterwards. If a second opinion is ever needed, that recording is what makes it possible.

Written by Platte Sewer Co. For sewer repair littleton co and the surrounding ZIP codes, 80120 to 80130, call (720) 615-8027.