If the host pipe still holds its shape, trenchless methods — cleaning, milling, and epoxy brush coating — can usually restore it from the inside with no digging. If the pipe has collapsed, sheared apart, or lost its structure, excavation and replacement is the honest answer. A camera inspection is how you tell the difference.
This is the fork in the road for every serious sewer repair, and it is where homeowners get burned in both directions: sold a dig they did not need, or sold a liner on a pipe that could not hold one. Here is how the decision actually works.
What trenchless repair really is
Trenchless is not one method — it is a sequence. First the line is cleaned back to bare pipe with hydro jetting. If hardened scale or old liner material is choking the diameter, milling cuts it out mechanically. Then epoxy brush coating rebuilds the interior wall — sealing cracks, pinholes, and corrosion into a smooth, continuous surface.
The result is a restored pipe inside your existing pipe, reached through existing access points. Yard, driveway, landscaping, and patios stay exactly where they are — which is most of what makes excavation expensive.
What trenchless needs to work
One thing, mostly: a host pipe that still holds its round. Epoxy needs a wall to bond to. Cracks, corrosion, root damage at joints — all fine. But a coating cannot bridge a pipe that has caved in, telescoped, or separated so far that there is soil where pipe should be.
When excavation is the honest answer
- Collapsed sections — crushed clay or Orangeburg that has flattened out
- Sheared or fully separated joints — usually from ground movement
- Severe bellies — a liner follows the pipe's shape, sag included; coating a deep belly just gives you a smoother belly
- Lines destroyed by roots — when there is more root than pipe left
When it comes to that, camera locating keeps the dig surgical: we excavate the failed run — not the whole yard — replace it, and restore the site. Often the fix is a hybrid: dig the collapsed six feet, then line the rest.
The questions to ask any contractor
- "Can I see the camera footage?" — if there is no footage, there is no diagnosis.
- "Why this method for this pipe?" — the answer should reference what the camera showed, not a package deal.
- "Will you verify the repair on camera afterward?" — we do, on every job, and you watch.
The right answer is whichever one your pipe actually needs — and the camera, not the sales script, is what knows. For what each path costs, see our Denver sewer repair cost guide.