A resin liner cured inside the existing drain, sealing every joint. And because it can be done in sections, it is often the only version of this repair a small block can actually fund.
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Relining is normally sold on being tidy. No trench, no mess, done in a day. In a six-pack there is a far more useful argument, and it is a financial one.
A liner can be installed in sections. The worst run this financial year, the next one after the following budget, each stage a finished piece of work in its own right rather than half a job left hanging.
Excavation cannot be divided that way. Once a trench is open it has to be completed, so the whole cost lands in one levy. For a scheme of six owners with no meaningful sinking fund, that is frequently the difference between a repair happening and not happening.
So our quote sets out the full job, the staged version, and what deferring a year costs in continued clearing and added risk. Three numbers, so the committee is choosing rather than just being told what it cannot afford.
Ask which section is actually worst, and what it would cost to do that part first. In a small scheme that question is often the whole answer.
A shared line is common property, so the cost divides across the lots. In a six-lot scheme that is a number each owner can feel rather than one that disappears into a fund.
So the engineering is frequently the easy part and the funding is the hard part, and pretending otherwise wastes everybody's time.
This page is written for that situation rather than for a building with money in the bank.
A liner can be installed run by run, each one a complete repair in its own right that stands on its own if nothing else ever happens.
An open excavation is a single committed job. You cannot dig half a trench and come back next financial year.
That difference is what makes lining fundable for a small scheme, and it is frequently more important than the difference in headline price.
Continued clearing at the current frequency, the risk of an emergency call-out at emergency rates, and the damage if a stack fails rather than blocks.
None of that appears on a quote for the repair, and all of it is what the scheme is already paying without having decided to.
Adding it up is the argument. Twenty clearances over a decade is a repair nobody voted for.
A written scope, a fixed figure, staged options, and the cost of doing nothing. That is what can go on an agenda and be voted on.
A verbal recommendation from a plumber cannot, however sound it is, which is why so many of these decisions never get made.
We put all four in writing as a matter of course, because in a small scheme it is the only way anything happens.
The line is cleaned and filmed, a resin-saturated liner is drawn through it, and air pressure holds it against the inside wall while it cures.
When it has set you have a continuous jointless pipe inside the original, slightly smaller in bore and considerably smoother.
All of it is done through an existing access point. No trench, no reinstatement, and nothing above the pipe disturbed.
A liner needs enough sound pipe to press against. A collapsed or crushed length has nothing to form inside and has to be replaced.
That is exactly the thing worth establishing early in a scheme with no funds, because it is the scenario that changes the number substantially.
It is also an argument for filming sooner rather than later, because a line that is lineable today may not be in three years.
Original stacks in buildings of this era are frequently cast iron, which corrodes internally and loses bore over decades without anything showing from outside.
A liner restores a smooth continuous bore, which on a narrowed stack is a capacity improvement as well as a seal.
That is worth understanding, because it is why lining an old stack frequently performs better than the pipe did before it.
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 the same place is a fall problem, and no liner addresses it.
Grade gets checked from the footage before a quote is written, and where it is the issue we will say so.
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.
In a block there are more junctions than on a house, one for each flat served, so the after footage matters more.
A missed one stops that flat draining, which is immediately obvious rather than hidden.
An owners corporation should be able to compare properly, so we give the relining figure and the excavation figure for the same defect, with the length in metres and what each includes.
Ask the excavation quote how long the driveway and parking are out of use. In a six-lot building that is six households' parking.
If a quote offers only one method, ask what the other would cost.
A committee cannot act on a conversation. It can act on a written scope, a fixed figure, a staged option and a stated cost of doing nothing.
So the practical step after a survey is not chasing owners individually. It is putting those four documents in front of the next meeting.
We produce them as a matter of course, because in a small scheme it is the only way anything gets decided.
Quoted at a fixed price off the camera footage. These are indicative 2026 ranges. Staged options and the cost of deferring are included in the written scope at no extra charge.
Footage handed over. Credited against the reline if the scheme proceeds.
One failed joint or a short run. Frequently the affordable first stage.
Priced on length, diameter and how many bends are in it.
Old pipework taken back to clean wall so the liner forms properly.
The four things a committee needs in order to vote on any of it.
We film the line and hand over the footage before anyone quotes. The committee has to see it, not hear about it.
The full job, the staged version, and what deferring a year costs. So the meeting is choosing between options.
Through existing access, no common area excavated, and the outage window given in advance for the noticeboard.
The finished run recorded end to end so the owners can see exactly what they funded.
In a building this age that pattern is usually the pipe rather than the people. A camera will show which, and give the committee something it can actually act on.
Call 1300 381 569A resin-soaked liner is drawn through the existing drain, inflated so it presses against the pipe wall along the whole length, then cured until it hardens. What results is a continuous pipe formed inside the old one with no joints along the lined section. Joints are where roots enter and where corrosion opens gaps, so removing them is the point. The old pipe stays put and becomes the mould, so nothing has to be dug up.
Usually not, and this is the most useful thing about lining for a small block. It can be done in sections. The worst run this financial year, the next one after the following budget, with each stage a complete piece of work rather than half a job left open. Excavation does not divide that way: once a trench is open it has to be finished. A committee that cannot approve $7,000 can often approve $2,500 twice, and nobody offers them that because it takes longer to write up.
That is exactly the right question and it should be in every quote you receive. Deferring has a price: continued clearing at the current frequency, the risk of a failure becoming an emergency at emergency rates, and the chance that a section deteriorates past the point where lining is possible at all, which turns a reline into an excavation. We put those figures in writing so deferring stays a legitimate option, chosen with the numbers visible.
Usually, and it is most of what we line here. What rules it out is a section that has genuinely collapsed or been crushed, or one so far gone there is nothing left to form a liner against. The camera settles that before anyone quotes and the footage is handed over. If lining will not work we say so rather than selling one that fails.
A sectional patch takes hours; a full run is generally most of a working day, and you get the window in advance so it can go on the noticeboard. It goes in through existing access points, so no common area is excavated and nobody loses a courtyard for a week. In a building with no lift and shared access, that difference matters more than it does in a house.
A shared line is generally common property, so it is the owners corporation's decision and its cost, not the individual owner's who happens to have the blocked toilet. In a self-managed block that means the committee needs a written scope, a figure, staging options and the cost of doing nothing. We provide all four as part of the inspection, because a verbal opinion cannot be voted on.
A sectional patch over one failed joint is about $900 to $2,200. A full run is usually $3,500 to $7,000 depending on length, diameter and bends. A camera inspection is $250 to $450, credited against the reline if you proceed. Staged options and the cost of deferring are included in the written scope at no extra charge.
Tell us how many lots are in the scheme and whether anyone has filmed it. Both change what we prepare and what the committee will need from us.
Quoted off the footage, with staged options and the cost of waiting set out beside the full figure.
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