Once you have established that trenchless is the right approach, one question remains: rehabilitate the existing pipe, or destroy it and pull a new one through?
That is the difference between CIPP lining and pipe bursting, and it is not a matter of preference. Each has conditions under which it is the only sensible choice.
The essential difference
CIPP lining keeps your pipe. A resin-saturated liner is installed inside it and cured into a hard, jointless pipe-within-a-pipe. The old pipe becomes the mold and the outer shell.
Pipe bursting destroys your pipe. A cone-shaped head is winched through it, fracturing it outward into the soil while towing new HDPE in behind. You end up with genuinely new pipe on the old alignment.
| CIPP lining | Pipe bursting | |
|---|---|---|
| Cost per foot | $80–$250 | $60–$200 |
| Result | Liner inside the old pipe | New HDPE pipe |
| Expected life | ~50 years | 50–100 years |
| Diameter | Slightly reduced | Same or larger |
| Access needed | 1–2 small pits | 2 pits, one at each end |
| Time on site | Usually 1 day | 1–2 days |
| Needs a passable host pipe | Yes — essential | Helpful, less critical |
| Utility clearance needed | No | Yes — displaces soil |
| Fixes a belly | No | No |
When lining is the right answer
- Multiple root entry points along the run. The liner seals every joint simultaneously. This is CIPP’s single best use case — it converts a recurring annual expense into a solved problem.
- Cracked but structurally intact pipe. The host still holds its shape and simply leaks.
- Cast iron under a slab. Avoids cutting concrete, which is where the money is on an interior job. See cast iron replacement.
- Utilities running close alongside the lateral. Lining displaces nothing, so proximity is irrelevant.
- Only one access point available. Some lining methods work from a single entry; bursting needs two pits.
When bursting is the right answer
- Old clay pipe. Brittle, fractures cleanly, ideal host. Much of pre-1975 US housing qualifies.
- You need a larger diameter. Bursting can upsize; lining can only reduce.
- Severely deteriorated host pipe. Where the wall is too far gone to support a liner, but a continuous path still exists.
- You want new pipe, not a rehabilitation. HDPE fused into a continuous run with no joints has the longer life expectancy, and at resale “replaced” reads differently from “lined”.
- Badly deformed Orangeburg, which is generally not a viable lining host.
The disqualifiers
Bursting is off the table when…
Other utilities run close to the lateral. This is the main practical constraint. The bursting head pushes the fractured pipe outward into the surrounding soil, and anything nearby feels that. Gas lines, water services and electrical conduits within a few feet are a genuine hazard, and a responsible contractor will decline. Ask what clearance they verified and how.
The soil cannot accept displacement — rock, or very dense compacted fill.
The host pipe will not fracture — ductile iron and some steel deform rather than break.
Lining is off the table when…
The pipe is collapsed. A liner needs a continuous open path. No path, no liner.
There is a severe offset. Beyond a certain step the liner cannot negotiate the transition and will wrinkle or fail to seat.
The host has lost structural integrity — a cast iron pipe with no invert left has nothing to support the liner during cure.
The bore is already marginal and cannot afford the diameter loss.
This is the most important sentence on the page. A liner conforms to the existing shape; a bursting head follows the existing alignment. Both reproduce the sag. If a camera has documented a belly, the only fix is excavation and re-bedding of that section — see sewer line belly. Treat any trenchless quote that claims to correct grade as a claim to get in writing, with a warranty attached.
A few years back, I had a homeowner who wanted lining because it sounded less invasive, but the footage showed a stretch holding standing water on every pass. In my experience, sealing that section would have looked perfect on install day and started backing up again within a year. We ended up excavating just that stretch and lining the rest of the run, and the system has been trouble-free since. I still tell people the same thing on every job: if the camera shows a sag, no liner or burst head is going to argue with gravity.
Quality factors worth asking about
For lining
- Resin type and cure method. Ambient, hot water, steam and UV all work; UV is fastest and most controllable, and generally the most expensive.
- Liner thickness and the standard it meets. ASTM F1216 is the reference. A liner that does not cite a standard is not a specified product.
- Preparation. The host must be cleaned — usually jetted, and descaled if it is cast iron. Lining over debris produces a liner shaped around the debris.
- Reinstatement of connections. The liner covers any branch connection, which must be reopened with a robotic cutter. Confirm it is included.
- Post-installation camera inspection. Insist on it, and on receiving the footage. Wrinkles, dry spots and incomplete cure are all visible and all matter. Many post-installation reports now grade defects on the NASSCO PACP (Pipeline Assessment and Certification Program) 1-to-5 scale, so ask for that rating alongside the footage.
For bursting
- Utility locate. Confirm that a full locate was performed and what clearances were found. This is a safety item, not a formality.
- Fusion quality. HDPE sections are heat-fused. A bad fusion joint is the one weak point in an otherwise jointless run.
- Pit restoration. Two pits still have to be backfilled, compacted and resurfaced. Ask what is included.
- Post-installation camera inspection, same as above.
Cost in practice
On a typical 60-foot residential lateral:
- Lining — $4,800 to $15,000
- Bursting — $3,600 to $12,000
- Open trench for comparison — $3,000 to $15,000, plus restoration
Bursting is usually slightly cheaper per foot; lining is often cheaper in total on interior or slab work because it needs less access. Both usually beat open trench decisively once there is a driveway or mature landscaping above the run — and that comparison, not the per-foot rate, is the one to make. Model your own with the cost calculator.
Which lasts longer?
Bursting, on paper — fused HDPE is rated 50 to 100 years against roughly 50 for a CIPP liner. In practice installation quality dominates the difference. A well-installed liner outlasts a poorly fused burst every time.
Can either be done through a house?
Lining routinely, which is exactly why it is the preferred method for under-slab cast iron. Bursting requires pits at both ends and soil that can accept displacement, so it is rarely practical inside a building.
What if my line has both roots and a belly?
Then it is a hybrid job: excavate and re-bed the sagged section, line or burst the remainder. This is a completely normal scope, and a contractor who proposes it is reading the footage correctly rather than selling a single product.
Do I need a permit for trenchless work?
Almost always. Trenchless is still sewer work and is still inspected in nearly every US jurisdiction. Some municipalities additionally require the liner product to be on an approved list — worth checking before you sign.
Why did one contractor say bursting is impossible on my line?
Most likely utility clearance — something running too close to the lateral — or a host pipe that will not fracture cleanly. Ask which, specifically. It is a legitimate and common constraint, and the answer tells you whether they actually assessed the site.
Pricing surveyed August 2026. See the Methodology and Data Sources.
