Sewer Line Repair FAQ
What are the differences between sewer pipe relining and replacement?
These are not two ways of doing the same job. They fix different defects, and the camera footage usually decides between them before price enters the conversation.
Short answer
Relining leaves the old pipe in the ground and builds a new one inside it. A resin-saturated liner is pulled or inverted into the host pipe and cured in place, producing a jointless pipe-within-a-pipe, which is why it is called cured-in-place lining. Replacement removes the old pipe or bursts it apart and puts new pipe in its path. The practical difference is what each can fix. Lining seals cracks, root intrusion at joints and corrosion, and it preserves whatever is above the pipe, but it needs a host pipe that is still structurally continuous and it cannot correct a sagging section, because it follows the existing grade. Replacement is the answer for collapse, severe offsets and bellies, since it re-establishes the fall.
How Each One Works
Relining, properly cured-in-place pipe, leaves the old lateral in the ground and builds a new one inside it. A felt or fibreglass liner saturated with resin is pulled or inverted into the host pipe, inflated against the wall, and cured with heat, steam or ultraviolet light. What results is a jointless pipe within the old pipe, bonded to it, typically warranted for fifty years. Branch connections are then reopened from inside with a robotic cutter.
Replacement puts new pipe in the ground. Either the old line is dug up and removed, or a bursting head is winched through it to fracture it outward while drawing the new pipe in behind — pipe bursting, which is a replacement method even though it needs no trench. Either way the new pipe is laid to a fresh grade.
What Actually Decides It
| Camera finding | Lining | Replacement |
|---|---|---|
| Cracks, root intrusion at joints, corrosion | Yes — ideal case | Works, more disruptive |
| Belly or sag holding water | No — follows existing grade | Yes — re-establishes fall |
| Severe offset at a joint | Usually no | Yes |
| Collapsed section | No — nothing to line | Yes |
| Deformed Orangeburg | No | Yes |
| Pipe already undersized | Caution — liner reduces bore | Yes — can upsize |
The pattern is simple: lining repairs a pipe that has defects but is still a pipe. Replacement is for a pipe that has stopped being one, or that was laid wrong in the first place. Grade is the dividing line most people miss — no lining method lifts a sagging pipe, so a belly stays a belly and keeps collecting.
The Trade-Offs Beyond the Defect
Where both are technically viable, the decision comes down to what sits above the pipe and how long you want to be without drainage. Lining preserves driveways, patios and mature trees, generally finishes inside a day, and needs only access pits. Replacement costs less per foot on an open, shallow run, lets the pipe be upsized, and removes any question about the condition of the host.
Cost is genuinely situational rather than one being cheaper, which is covered in the cheapest way to replace a sewer line. Whichever route applies, both are within scope on our sewer line repair and trenchless lining page, and for work extending into the shared mains, sewer and water main replacement covers the rest. We would rather scope first and recommend the narrower job where one exists.
Talk to a Licensed Colorado Plumber
Think Your Sewer Line Is the Problem? Scope It First
We camera the line before we quote it. Roots at a joint, a cracked section, a belly holding water and a collapsed pipe all produce similar symptoms and call for completely different work — and often for a spot repair rather than a full replacement.
Trenchless lining, pipe bursting and open-cut replacement, with flat pricing, across Fort Collins, Loveland, Wellington, Windsor, Berthoud, Laporte, Greeley and Estes Park.
Visit our Sewer Line Repair page to review the full scope of work and request service.