A resin liner cured inside the existing drain, sealing every joint along it. On low ground beside a shared wall, not opening a trench is the safer answer as well as the tidier one.
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Relining is usually sold on tidiness. No trench across the lawn, no fortnight of mess, the garden left as it was. All true, and in most suburbs that is the whole argument.
Here there is a stronger one underneath it. This is the floor of a valley that was swamp before it was suburb, drained in the 1890s and built over. The water table sits shallow. Dig down to sewer depth and the hole starts filling, so now you are pumping to keep a workable trench open.
On the lots through here that trench is rarely far from a boundary and frequently close to a shared wall. Dewatering made ground next to somebody else's footings is how you turn a drainage repair into a conversation with the neighbour and their insurer.
So relining is not the neat option here so much as the low-risk one. Nothing gets opened, nothing gets pumped, and nothing beside you gets undermined.
Nobody should quote you a reline off a description, and on this ground nobody should quote you a dig without knowing where the water starts.
The original drainage under most of this housing is earthenware laid in short lengths with a joint roughly every metre, and the barrel is frequently sound.
It is the joints that have moved, opened and let roots and material in, over a century on ground that was drained swamp and has never been entirely stable.
So the useful repair is one that addresses all of them rather than the one that failed most recently.
The liner is drawn through, inflated against the wall and cured in place, leaving a continuous pipe with no joints along the lined section.
No joints means no entry points, which is the difference between removing the mechanism and cutting out this season's roots.
It is structural in its own right rather than a coating, which is why it carries a design life measured in decades.
Sewer depth on low, made ground frequently means digging into ground that is wet, and a trench that fills with water is a considerably larger undertaking than a dry one.
It needs dewatering, it needs shoring, and made ground does not hold a trench wall the way undisturbed clay does.
So an excavation quote on this ground that looks comparable to one on a ridge has probably not accounted for it.
Lots through this suburb are narrow and a lot of the housing shares walls or sits within a metre of the boundary.
Excavating to sewer depth beside a neighbour's footing on soft made ground is not something anybody should be casual about.
That is a genuine engineering constraint rather than an inconvenience, and it is frequently the reason no-dig is the only sensible method here.
A resin-saturated liner is drawn into the existing pipe, inflated against the inside wall and cured in place, forming a new pipe inside the old one.
It goes in through existing access, so nothing above the pipe is opened and nothing has to be reinstated.
On a narrow lot with no side access and a neighbour a metre away, that is frequently the difference between a job that can happen and one that cannot.
They do not break sound pipe. They find an opening that has already moved, and street trees through this suburb are mature and close to the lines.
Cutting them out clears what is inside the pipe today and leaves the opening exactly as it was, which is why the interval between visits keeps shortening.
Sealing the run addresses the cause, and it does not ask anybody to take a street tree out.
A pipe that has fully collapsed, or one that has lost so much wall there is nothing to cure against, has to be excavated and replaced.
Grade is the other one. A pipe can be intact and still fail because a section has settled, and on made ground over drained swamp that is a real possibility.
Both are visible on camera in seconds, which is why the survey comes before the quote.
Where one length has collapsed or lost its fall, that section gets replaced and the rest gets lined. It is a common and sensible outcome rather than a compromise.
On this ground it also keeps the excavation to one small place, which matters when the alternative is a long trench in wet made ground beside a neighbour's wall.
A quote presenting it as one method or the other is selling a method rather than solving a problem.
The liner passes over each branch connection on the way in and each is cut back open from inside once the resin has set. Routine, and confirmed on camera.
A missed one stops the branch it serves draining, which is immediately obvious rather than hidden.
On housing altered as much as this has been, the junctions are where later work met the original, so they get a close look on the before footage too.
You should be able to compare, so both figures come together for the same defect, with the length in metres and what each includes.
Ask an excavation quote what it assumes about groundwater and how it proposes to support the trench, because on this ground both are real costs.
If a quote offers only one method, ask what the other would cost.
Quoted at a fixed price before it starts, off the camera footage rather than off a guess. These are indicative 2026 ranges. Compare them against a dig quoted honestly here, with pumping, saturated spoil and reinstatement included.
Down the line with footage handed over. Comes off the reline if you go ahead.
One bad joint or a short damaged length, sealed without touching the rest.
House to boundary. Priced on length, diameter and how many bends are in it.
The line has to be back to clean wall before a liner will form properly against it.
The same line filmed again afterwards, so you can see what you paid for.
We film the line and hand the footage over before anyone quotes anything, because the pipe's condition decides whether lining is even possible.
Roots cut and the line jetted, so the liner forms against clean bore rather than against whatever was in the way.
Drawn through the existing access, inflated the length of the run, cured hard. No trench, no pumping, nothing opened up.
The finished line filmed end to end so you can see the joints are gone rather than take our word for it.
That pattern is usually joints, not bad luck. A camera will show you which ones, and whether sealing them ends it for good.
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A resin-soaked liner is drawn through the existing drain, inflated so it presses against the pipe wall along its whole length, and then cured until it sets hard. What you end up with is a continuous pipe formed inside the old one, with no joints along the lined section. Since joints are where roots enter and where ground movement opens gaps, removing them is the point of the exercise. The old pipe stays where it is and becomes the mould.
Because of what you dig into. Marrickville sits low, on ground that was swamp until it was drained in the 1890s and built over. The water table is shallow. Go down far enough to reach a sewer and a trench will often start taking water, which means pumping it out to work in it. That is slow, it is messy, and on a narrow lot it is happening within a metre or two of a shared wall. Dewatering next to a neighbour's footings on made ground is a genuine risk, not a theoretical one.
Usually yes, and it is the most common thing we line here. Earthenware was laid in short lengths, so there is a joint every metre or so, and after a hundred-odd years those joints are where everything goes wrong. Lining bridges all of them at once. What rules it out is not the material but the condition: if a section has fully collapsed, or lost so much wall that there is nothing left to press the liner against, that part needs replacing first.
A camera goes down first, always. The footage tells us whether the pipe is intact enough to act as a mould, where the joints are open, whether roots are through and how far, and whether anything has dropped out of alignment. We hand that footage over. Nobody should be quoting a reline off a description of the symptoms, and here nobody should be quoting a dig without knowing what depth the water starts at either.
It affects the alternative more than it affects the reline. Heritage conservation areas are widespread through this suburb, and they constrain what you can change externally. A tiled path, an original front fence, a mature street tree, a period frontage: all things that are straightforward to trench through and expensive or contentious to put back. Relining goes in through existing access points and leaves the surface as it was, which sidesteps that conversation entirely.
Most residential relines are done inside a day. The line is out of service while the liner cures, typically a few hours, and we will tell you the window before we start so you can plan around it. It is not a multi-day job with a trench open across the property, which on a lot where the only access is the front path is the difference between an inconvenience and a fortnight.
Sectional patches over a single bad joint run about $900 to $2,200. A full run from the house to the boundary is usually $3,500 to $7,000 depending on length, diameter and how many bends it has. A camera inspection is $250 to $450 and comes off the reline if you proceed. It reads as more than a dig until you price the dig properly here, with pumping, spoil removal and reinstating a heritage frontage in it.
Tell us whether anyone has filmed the line yet, and whether the property shares a wall. Both change what we recommend and what a dig would actually involve here.
Quoted off the footage, at a fixed price, with the finished line filmed again afterwards.
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