Warranties on drainage work in Queensland, and exactly what to do if your drain fails.
Three separate protections run at once. The product warranty from the manufacturer covers pipe, fabric, grates and tanks, commonly 10 to 25 years. The workmanship warranty comes from your contractor and should be in writing, with 5 to 7 years a fair ask on drainage. Under both sit the Australian Consumer Law guarantees, which have no fixed expiry. In Queensland the QBCC licenses the trade and runs the defect complaint process: within 12 months for non structural defects, and within 6 years and 6 months for structural ones.
Drainage is buried, which makes it the trade where warranty arguments are hardest to settle and easiest to avoid. Hardest, because nobody can see what was done once the trench is closed. Easiest, because a quote that names the pipe grade, the bedding, the fabric weight and the fall turns any later dispute from an argument about opinions into a comparison against a document. This page sets out who covers what in Queensland, in what order to escalate, and what to keep in the folder so you are never arguing from memory.
What is covered, by whom, for how long
Three sources of protection overlap. They are not alternatives: a failure can sit under more than one at the same time, and you are entitled to use whichever fits best.
| What went wrong | Who covers it | How long | What you need to show | Where it is written down |
|---|---|---|---|---|
| Pipe or fitting fails from a manufacturing fault | The manufacturer, normally handled through the contractor who supplied it | Commonly 10 to 25 years; uPVC makers quote a 50 year design life | Product identification, the supply invoice, and that it was installed to the makers instructions | The published product warranty, plus the goods guarantees in the Australian Consumer Law |
| Geotextile blinds off or tears | Manufacturer if it is a fabric fault, contractor if the wrong grade was used | Fabric warranties commonly 10 to 20 years | The gsm specified on the quote against what was installed, and a photo of the open trench | Product warranty and your written scope |
| Grate cracks or corrodes | Manufacturer, unless the wrong load class was specified for the use | 1 to 2 years on light polymer grates, 10 to 25 years on channel bodies, longer on ductile iron | That the AS 3996 class matched the traffic actually crossing it | Product warranty |
| Tank splits, or the controlled outlet fails | Tank manufacturer, subject to correct base preparation | Commonly 10 to 20 years | Base preparation photos and the installation record | Product warranty and the approved hydraulic detail |
| Fall is wrong, a joint has let go, the line has bellied, or an unwrapped subsoil drain silted up | The contractor. This is workmanship, not product | No automatic figure. Ask for 5 to 7 years in writing before you sign | Camera footage, the quoted scope, and dated photographs | Your written contract or quote |
| Defective building work, non structural | Queensland Building and Construction Commission complaint process | Complaint generally must be lodged within 12 months of the work | That you gave the contractor written notice and a chance to fix it first | The QBCC Act and the QBCC standards and tolerances material |
| Defective building work, structural | QBCC complaint process | Complaint generally must be lodged within 6 years and 6 months of completion | Same, plus evidence of the structural consequence | The QBCC Act |
| Work not done with due care and skill, or not fit for the stated purpose | Australian Consumer Law consumer guarantees, enforced in Queensland through the Office of Fair Trading | No fixed expiry. Runs for a reasonable time given the nature and cost of the work | What you asked for, what you got, and what a reasonable person would expect | Schedule 2 of the Competition and Consumer Act 2010 |
| Contractor does not finish, or ceases trading mid job | The QBCC home warranty insurance scheme, but only where the job is insurable work under the scheme and above its dollar threshold | Set by the scheme, not by your contract | The notice of cover, and proof the premium was paid | The scheme terms. Standalone drainage on an existing home is often not insurable work, so ask specifically whether a premium applies to your job and confirm the notice of cover arrives |
| A sudden escape of water damages the house | Your home insurer, for the resultant damage. The drain itself is usually excluded | The policy period, with prompt notification required | That the escape was sudden rather than gradual, with dates and camera evidence | Your product disclosure statement. See the insurance claims page |
The escalation steps, in order, with timeframes
Do not skip a step. Every formal process in Queensland expects you to have given the contractor written notice and a genuine chance to fix the work first, and skipping that is the most common reason a complaint stalls.
| Step | What you do | Timeframe | If it does not resolve it |
|---|---|---|---|
| 1. Written defect notice | Email the contractor with the address, the quote reference, what you observed, dated photos and what you want done. | Ask for a reply within 14 days and an inspection within 21 days | Go to step 2 rather than making phone calls that leave no record |
| 2. Formal rectification request | A second written notice naming the defect, the part of the scope it breaches, and a date by which you require rectification. | Allow 28 days to rectify, or less where water is actively entering the house | Go to step 3, keeping both notices |
| 3. QBCC complaint | Lodge a complaint about defective building work. QBCC will normally attempt early dispute resolution and can then inspect and issue a direction to rectify. | Within 12 months for non structural defects, within 6 years and 6 months for structural. Allow weeks, not days, for the process | Step 4 or step 5, depending on whether the issue is a licensed building defect or a consumer guarantee failure |
| 4. Office of Fair Trading | Raise a consumer guarantees issue where the problem is the service quality or a misleading claim rather than a technical building defect. | No fixed deadline, but act promptly. Conciliation typically takes several weeks | Step 5 |
| 5. QCAT | Apply to the Queensland Civil and Administrative Tribunal. Minor civil disputes are heard up to $25,000, and for a domestic building dispute the tribunal will expect the QBCC pathway to have been used first. | Filing fees apply and hearings are usually months away, not weeks | Step 6 |
| 6. Insurance or legal advice | Where the real loss is damage to the house rather than the drain, notify your insurer. Where the amount is large, get advice before the limitation period runs. | Notify the insurer as soon as you become aware of the damage | This is the end of the ladder |
General information for Queensland homeowners, not legal advice. Check current thresholds and timeframes with the QBCC and the Office of Fair Trading, because they are reviewed periodically.
The rules that actually apply to a drain in Toowoomba.
Four separate bodies of law touch a drainage job here, and knowing which one you are relying on is half the battle when something fails.
Licensing and building work. The Queensland Building and Construction Commission licenses plumbers and drainers and administers the complaint and direction to rectify process for defective building work. Its register is public, and checking a licence number takes a couple of minutes. The commission also sets out standards and tolerances that describe what counts as defective, which matters because it moves the argument off personal opinion. Queensland also sets requirements for domestic building contracts by value under the domestic building contracts schedule of the QBCC Act: smaller jobs need less prescribed paperwork, and jobs above the higher tier, which sits at twenty thousand dollars, require a far more detailed written contract. Confirm the current figures with the QBCC, since they are reviewed from time to time.
Plumbing and drainage law. The Plumbing and Drainage Act 2018 and the Queensland Plumbing and Wastewater Code govern how the work must be done and who may do it, and AS/NZS 3500.3 is the technical standard for stormwater. The practical consequence for a homeowner is that a compliant job has a paper trail: an application where one was required, an inspection, and a certificate. That paper trail is your best evidence in any later dispute. The council approval page sets out when a Toowoomba Regional Council application is needed.
Consumer guarantees. The Australian Consumer Law, in Schedule 2 of the Competition and Consumer Act 2010, requires services to be supplied with due care and skill, to be fit for any purpose you made known, and to be delivered in a reasonable time. Goods must be of acceptable quality. These guarantees cannot be excluded by a contract term, they have no fixed expiry, and they sit underneath every warranty a contractor offers you. A warranty that promises less than the law already gives you is not worth much.
Home warranty insurance. The QBCC scheme is a safety net for insurable residential construction work above a dollar threshold, funded by a premium the contractor pays. The trap for drainage is that standalone site drainage on an existing home is often not insurable work under the scheme. Do not assume you are covered. Ask the contractor directly whether a premium applies to your job, and if they say yes, check that the notice of cover actually arrives in your name.
Want a quote with the warranty terms written into it?
Our written quotes name the specification, the workmanship warranty period and the settlement visit before you sign anything.
What to keep, and for how long.
Every dispute we have ever seen resolved quickly was resolved by a photograph. Build the folder as the job happens, because none of it can be recreated afterwards.
- The quote and any variations, with the scope wording intact. This is the document everything else is measured against.
- The contractor licence number and ABN, and a screenshot of the licence register entry on the day you signed.
- Photographs of the open trench, showing bedding under the pipe, the geotextile, the aggregate and the pit connections. Ten photographs on your phone is enough, and they are worth more than anything else in the folder.
- Camera footage and the flow test, where either is part of the scope. Ask for the file, not a description of it.
- The compliance certificate for any work that required an application and an inspection.
- Product data sheets for pipe, geotextile, grates and any tank, because warranty claims start with identifying the product.
- The final invoice showing the ABN and the licence number, and proof of payment.
- Every email. A drainage dispute is a timeline argument, and email is the only record with dates on it.
Keep the folder for at least as long as the structural complaint window, which is six years and six months, and realistically for as long as you own the house. When you sell, hand it to the buyer. A drainage folder with trench photos and a certificate is one of the few pieces of paperwork that genuinely helps a sale, which is covered on the selling page.
Defect, or fair wear? How to tell before you complain.
Getting this right protects your credibility. Raising a maintenance item as a defect makes the real defect harder to argue later.
These are defects.
- Camera footage showing reversed or flattened fall, or a belly holding water, on a line laid to a quoted grade.
- A joint that has separated, or a pipe cracked along its length where nothing has been driven over it.
- A subsoil drain that stopped working within a couple of wet seasons where the quote specified geotextile.
- Water still ponding in the exact area the quote said would be drained, in ordinary rain.
- A trench line still sinking more than about 50 millimetres after the settlement visit.
- A grate cracked under a normal domestic vehicle where the quote said it was rated for driveway use.
- A pit lid sitting proud enough to catch a mower, or set out of level.
These are fair wear or maintenance.
- Silt in the silt pit. Collecting silt is precisely what it is for, and it needs clearing once or twice a year.
- Leaf litter in a channel grate, and grass creeping over the edges of it.
- Settlement of 10 to 30 millimetres along the trench line in the first month or two in reactive clay.
- A system overwhelmed by a storm well beyond what it was designed to carry. Toowoomba gets those.
- Surface scratching or fading on a grate.
- Roots entering an old line, twenty years on, that we did not install.
The genuine grey area is a blockage. A drain that blocks in year one on a job that included a camera check is usually a workmanship question. A drain that blocks in year eight, full of the wrong thing, is usually not. Camera footage decides it, which is why it is worth $220 to $450 before an argument rather than after one. The blocked drains page explains what the footage actually shows.
What no warranty will cover, and what we will not warrant.
An honest warranty has edges, and it is better to know them before you sign than after something fails.
- Blockages caused by what goes into the drain: builders waste, sand from a rendering job, cooking fat, or a garden hose full of soil left running into a pit.
- A storm well beyond the design event. A system built to carry a heavy Toowoomba storm can still be exceeded, and being exceeded is not a fault.
- Changes on a neighbouring property that redirect water onto yours after the job was designed.
- Damage from something driven or driven into the line: a fence post, a star picket, a retaining wall footing, a tree planted directly over the trench.
- Extensions or alterations someone else makes to the system afterwards.
- Existing pipework we did not install. We will connect to it, but we will not warrant its condition unless we have camera footage of it, and we say that on the quote rather than at the claim.
The last one matters more than people expect. Roughly half the drainage jobs in older Toowoomba suburbs involve tying new work into an existing line of unknown age and condition, sometimes original earthenware. Spending $220 to $450 on a camera check first is the difference between a warranty that means something and one full of exclusions. The lifespan page covers how to judge what you already have.
The honest truth: most disputes are prevented at the quote.
In our experience almost every drainage dispute traces back to a scope that was written loosely enough for two people to read it two ways. Install ag drain to rear yard is not a scope. Sixty metres of 100mm slotted pipe to AS 2439.1 in a 300 by 500 trench, fully lined with 140 gsm non woven geotextile, filled with 20mm washed aggregate, laid at 1 in 200 minimum to a silt pit and out to the kerb, with turf lifted and relaid and a settlement visit at six weeks, is a scope. The second version costs the same to build and removes almost every argument that could follow.
So before you sign anything, ask for the specification in writing, the workmanship warranty period in writing, and confirmation of who lodges any council application. Ask what the settlement allowance is and when the follow up visit happens. Then take the trench photos yourself on the day. Those four things cost you nothing and they are worth more than any warranty clause, because they are what a warranty clause gets measured against.
Warranty questions we get asked.
How long is the warranty on drainage work in Queensland?
Who licenses drainage contractors in Queensland?
How long do I have to complain about defective drainage work?
What is the difference between a drainage defect and fair wear?
What should a drainage defect notice say?
Does home insurance cover a failed drain?
Get a quote with the specification and the warranty in writing
Send this and we book a free on site measure, then send a fixed written quote that states the materials, the workmanship warranty period and the settlement visit, usually within 7 days.
Had drainage work fail on you already?
A camera inspection tells you whether you have a defect claim or a maintenance job, before you write a single letter.