The short version
| Trenchless | Open-cut | |
|---|---|---|
| Ground opened | Two pits, ~3 ft square | Full trench along the line |
| Typical time on site | 1 day | 1–2 days |
| Pipe work | Priced per foot | Often similar per foot |
| Restoration cost | Minimal | Frequently the largest item |
| Works on collapsed pipe | No (bursting sometimes) | Yes |
| Works on a belly | No | Yes — the only fix |
| Works on Orangeburg | No (bursting sometimes) | Yes |
| Can upsize the pipe | Bursting only | Yes |
| Handles sharp bends | Limited | Yes |
Where the cost difference actually comes from
This is the part most comparisons get wrong. Per foot of pipe, the two methods are closer in price than people expect. The difference is almost entirely in what happens to the ground.
An open-cut trench across a Littleton front yard may cross a concrete driveway, a flagstone path, an irrigation main and the root plate of a mature tree. Putting all of that back is frequently a larger line on the invoice than the pipe work. Trenchless skips it.
Where the line runs under nothing but open lawn — which does happen, particularly on newer lots in Highlands Ranch and Roxborough — an open-cut dig can come out even or cheaper. It genuinely depends on your yard.
When digging is not optional
Four findings take trenchless off the table, and no amount of preference changes them.
- A belly. Lining follows the shape of the host pipe, so lining a sag preserves the sag. The water keeps standing and the blockages keep coming. The only fix is opening the ground and re-bedding the pipe at proper grade.
- Full collapse. A liner needs a round host to cure against and a bursting head needs a path to follow. A caved-in section offers neither.
- Orangeburg that has deformed. It cannot hold a liner, and bursting through flattened Orangeburg is unreliable. More on Orangeburg.
- Hard bends. A 90-degree elbow stops a liner and a bursting head alike. Sometimes a spot dig at the bend alone is enough to make the rest trenchless.
Mixing the two
Jobs are not all-or-nothing, and treating them that way costs money. A common pattern here: the section under the driveway gets lined, the collapsed run under open lawn gets dug and replaced, and the homeowner pays for neither method where it does not fit.
That is only possible with accurate camera footage and surface locate marks, which is another reason the inspection comes first. What the camera run involves.
Find out which applies to your line
One camera run settles it. Under an hour, and the footage is yours whichever way it goes.
Call (303) 555-0147Questions to ask whoever quotes you
- Can I see the camera footage of my line?
- How deep is the line at the point of the problem, and how far from the cleanout?
- Is there a belly anywhere in the run?
- What material is the pipe?
- If you are recommending replacement, what rules out lining?
- Does the quote include surface restoration and the county permit?
A contractor who can answer all six has looked at your line. One who cannot is quoting from a price list.
Questions we get asked
Which is better, trenchless or traditional sewer repair?
Neither in general. Trenchless is better where the pipe is still round and the surface above it is expensive to restore. Traditional open-cut is better, and sometimes the only option, where the line has collapsed, has a belly, or is made of Orangeburg. The camera run decides.
Is trenchless sewer repair really no-dig?
It is low-dig rather than no-dig. Both lining and bursting need access pits, usually one at each end of the run and around three feet square. What they avoid is the trench along the length of the pipe, which is where most of the disruption and restoration cost sits.
Does trenchless repair last as long as a new pipe?
CIPP liners are generally rated by manufacturers for a 50-year design life, and fused HDPE from a pipe burst carries a similar expectation. Both are comparable to a new PVC lateral. The connections at each end become the parts to watch rather than the pipe itself.
When is digging the only option?
A fully collapsed section, a belly holding standing water, Orangeburg that has gone oval, and hard 90-degree bends all rule out lining and usually bursting too. Where a utility runs tight alongside the sewer, open-cut is also the safer route.
Can I do part of the line trenchless and part open-cut?
Yes, and it is common. A single bad section under a driveway might be lined while a collapsed run under open lawn is dug and replaced. The camera footage and locate marks are what let a job be planned that way.
Which one applies to your line
The choice is not really yours or ours — the condition of the pipe decides it. Four things on the camera run settle the question: shape, bends, bellies, and where the line runs.
Platte Sewer Co. — sewer line repair in Littleton, CO. Open 24 hours.