On sandstone, the digging is the expensive part of any drain repair. A resin liner cured inside the existing pipe avoids it entirely. Camera first, always, because quoting this work blind is guessing.
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Everything about drain repair here is decided by what is a metre under the grass. Chatswood sits on Hawkesbury Sandstone, and across the North Shore that rock frequently appears within excavation depth, sometimes within a metre of natural ground level.
It is not soft material. Hawkesbury Sandstone has been measured up to around 70 megapascals, which is why it was quarried by hand for more than a century to build half of colonial Sydney. Trenching through it means saws and breakers rather than a shovel, and the price, the noise and the time all move accordingly.
That single fact flips the economics. West of here, in the clay, excavating a failed section is comparatively cheap and relining has to argue for itself. On this ground the liner is frequently the cheaper repair outright, before you even count the driveway, the sandstone retaining wall or the mature garden that would otherwise have to come up and go back.
Get a camera down it before you agree to anything. On this ground the difference between lining and digging is usually the biggest number in the quote.
A liner saturated in resin goes into the damaged section, gets inflated against the existing pipe wall, and cures there into a new pipe formed inside the old one.
Continuous, smooth, slightly smaller in bore and structural in its own right rather than a coating over a problem.
It goes in through existing access, so nothing above the pipe is opened at all.
The sandstone here carries shale lenses, thin laminite bands and pockets of weathering, so the depth to workable rock varies over short distances.
Which means an excavation quote priced from what happened next door is a guess, and the variation arrives later as a variation.
A quote that states what it assumes about depth to rock, and what happens if rock is met earlier, is the honest kind.
Relining is quoted off length, diameter and bends, all of which are visible on camera before a figure is given. There is no ground assumption anywhere in it.
So a lining quote on this ground is a price rather than an estimate, and it can be compared properly against another lining quote.
That certainty is worth something on its own, quite apart from the difference in the number.
Where the camera shows one bad joint in an otherwise sound pipe, a patch liner over that section is the proportionate answer and it is considerably cheaper.
Where openings appear along the length, lining the run is the honest recommendation, because patching one of many buys a season.
The footage decides which, and you should see it rather than be told about it.
Where a stack or a line is original cast iron, it has been corroding internally for decades and the bore may be well down from what it started as.
A liner restores a smooth continuous surface, which on a narrowed pipe is a capacity improvement as well as a seal.
Whether enough sound material remains to line against is a question the camera answers, and the answer changes over time.
A liner covers the openings where branch lines join the main, so those are cut back open from inside once the resin has cured. It is routine and it gets confirmed on camera.
In a building there is a junction for every apartment served, so the after footage matters more than it does on a house.
A missed one stops that branch draining, which is immediately obvious rather than hidden.
In an apartment the useful question is not where the water appeared. It is whether the pipework is lot property or common property, because that decides who commissions the work.
A shared stack is generally the owners corporation's, which means a written finding matters more than a complaint.
Camera footage, a written scope and a fixed figure are what can go on a meeting agenda.
It restores the pipe. It cannot change the gradient the pipe was laid at, because the liner takes the shape of the host it cures inside.
So a run that films as sound but keeps blocking in one place is a fall problem, and no liner addresses it.
On ground where relaying a line means breaking rock, knowing that early matters a great deal.
A liner needs a host holding roughly its original shape to be formed inside. A crushed length has nothing to form against.
On shallow sandstone that excavation is expensive, which makes keeping it to one small place worth a great deal.
A short open repair plus a liner over the remainder is a common and sensible outcome rather than a compromise.
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 the excavation quote what it assumes about depth to rock. On this ground that single question is the most useful one there is.
If a quote offers only one method, ask what the other would cost.
A lift, a corridor, protection laid down, and a building's rules about all three. That has to be arranged in advance rather than on the morning.
It is entirely routine and it is the reason a survey visit and a work visit are separate here more often than in a house.
Raising it when the job is quoted rather than when it is booked is what keeps a one-day job to one day.
Relining is quoted per metre once the length, the diameter and the access are known. The camera comes first, because pricing this work without seeing the pipe is guessing. Compare any figure here against a rock excavation quote before you decide.
Non-negotiable first step. Establishes the fault, its position, and depth to rock.
Priced by length, diameter and access once the footage shows what we are working with.
Cut back open and reinstated after lining. Always itemised, never assumed.
Only where there is no usable existing access. On rock this is the part to price carefully.
Occasionally digging genuinely is the better answer here, and we will say so.
The footage establishes the fault. The locate establishes how far down the rock starts, which is what decides whether digging was ever a realistic option on your block.
Roots cut out and the bore washed down, because a liner cured against silt or root matter is a liner that fails early.
Resin liner in, inflated against the old pipe, cured hard. On a residential run this is a matter of hours, and nothing above ground is touched.
Every branch cut back open with the robotic cutter, then a second camera pass so you can see the reinstatement rather than take our word for it.
A line that blocks on a schedule is a pipe problem, not a habits problem. Get the camera down it before anyone quotes you to dig.
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A new pipe formed inside the old one. A resin-saturated liner goes into the damaged section, is inflated so it presses against the existing pipe wall, and cures hard. You end up with a continuous jointless pipe inside the original, sealing the cracks and open joints that were letting roots or groundwater in. The old pipe stays where it is and becomes the mould. Nothing is excavated except, sometimes, one small access point.
Because of what is under the lawn. Chatswood sits on Hawkesbury Sandstone, and across much of the North Shore that rock is within a metre or two of the surface. It is hard stone, measured up to around 70 megapascals, the same material that was quarried by hand to build colonial Sydney. Digging a trench through it is not a shovel job, it is rock saws and breakers, and the cost and the noise scale accordingly. West of here the ground is clay and excavation is comparatively cheap, so the relining argument is much weaker. Here it is often the difference between a day's work and a fortnight of it.
Sandstone in this area is not a flat slab. The formation carries shale lenses, thin bands of laminite generally under a metre thick but tens or hundreds of metres across, so depth to rock changes over short distances. One property can be into sandstone at 400mm while the house next door digs two metres of soil. That is exactly why we do not quote excavation from an address, and why the camera and a locate come first.
Both are common candidates around here. The older Federation and interwar houses through Chatswood West and the surrounding streets often still run original cast iron stacks and earthenware below ground, and the failure mode is corrosion, open joints and root intrusion rather than the pipe being gone entirely. A liner bridges all of it in one pass. What cannot be lined is a pipe that has collapsed or lost so much wall that there is nothing to line against, and the camera tells us which you have before anyone quotes.
When the pipe has collapsed, when it has deformed too far for a liner to seat, when the real fault is fall rather than sealing, or when the damage sits in soft ground close to an existing access point. That last one is rarer here than it is out west, but it happens, and when it does we will tell you that digging is cheaper. We would rather lose the bigger job than sell you the wrong one.
It depends where the fault is, not where the symptom shows. The line inside your lot is generally yours. The shared stack and the common drainage below it are generally the owners corporation's. A blockage low in a shared stack surfaces in whichever apartment sits closest to it, which is why the flat with the problem is very often not the flat with the fault. Camera footage is what settles that conversation with a strata manager, and we hand it over as a matter of course.
Standard residential lining runs roughly $500 to $900 per metre once the length, the diameter and the access are known. The camera inspection first is $300 to $750 and it is not optional, because quoting this work without seeing the pipe is guessing. Junction reinstatement and any access pit are quoted separately. Compare it against a rock excavation quote before deciding, because on this ground the gap is usually wide.
Tell us how often it blocks, and whether anyone has already quoted you to excavate. If there is a rock excavation figure in front of you, that is the number worth comparing against.
If it is a strata or shared line, say so, because who pays depends on where the fault is rather than where the water appeared.
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