Most new-build handover checklists focus on paint finish, tiling, cabinetry and whether the doors close properly. Almost none of them include a look at what’s actually happening underground, and that’s a gap worth closing while your builder’s statutory warranty is still active. Drain defects on new builds are common enough, and expensive enough once the warranty period has lapsed, that a CCTV inspection during your defect liability period is one of the more useful things you can do with the paperwork you’re already juggling at handover.
Why new pipes still fail
It’s a reasonable assumption that a brand-new pipe, freshly laid with modern PVC and installed under current standards, shouldn’t have any problems for decades. In practice, new-build drainage defects are rarely about the pipe material itself, PVC is a durable, well-understood product, they’re almost always about how the pipe was installed and what happened to the site around it during construction. A sewer or stormwater line laid early in the build program can sit in a trench for months while heavy machinery, delivery trucks and other trades move across the site above it. Backfill compaction, or the lack of it, around a newly laid pipe affects how the ground settles once the property is finished and occupied, and settlement that happens unevenly can crack a joint, shift a pipe out of its designed gradient, or put pressure on a junction that was correctly installed but not built to withstand an uneven load afterward.
Construction debris is the other recurring issue. Offcuts of PVC pipe, hardened concrete slurry, sand, and general building waste can end up inside a stormwater or sewer line during the build, particularly where a pipe run was left open or capped only loosely for an extended period. This kind of debris doesn’t always show up immediately; it can sit in the pipe restricting flow gradually until it eventually causes a blockage well after the family has moved in and the builder has moved on to the next job.
Where NSW statutory warranties fit in
Residential building work in NSW carries statutory warranty periods under home building compensation and warranty legislation: broadly, six years for defects that are structural or that affect the habitability of the building, and two years for other, non-structural defects. Where a drain defect falls within that framework can depend on how it’s classified and the specifics of your build, and that’s a question for your solicitor or a home warranty insurance claim rather than something to assume either way. What matters practically is the shorter of these windows, most contracts and last-resort warranty schemes measure from handover, and a defect only found well after that window has closed is a much harder (and sometimes impossible) claim to make, regardless of whether the underlying problem started during construction. The practical lesson is not to wait until something visibly goes wrong to look underground.
What a defect-period CCTV inspection typically finds
A CCTV inspection of a new build’s sewer and stormwater lines, run any time from just before handover through the following couple of years, commonly turns up a handful of recurring issues:
- Gradient (fall) problems: pipe sections laid with insufficient fall to drain properly, or ground settlement since laying that’s reduced or reversed the intended gradient in places, both leading to slow drainage or standing water inside the pipe.
- Construction debris: hardened concrete slurry, pipe offcuts, sand or general building waste inside sewer or stormwater lines, restricting flow well before any external symptom appears.
- Cracked or displaced joints from ground settlement: uneven backfill compaction around a newly laid pipe letting the ground settle unevenly once construction traffic and loading stops, stressing joints that were correctly installed at the time.
- Crushed or deformed sections: pipe that’s been driven over by heavy plant before backfill and compaction were properly completed, sometimes visible as a flattened or ovalised section on camera even where the pipe hasn’t fully failed yet.
- Misaligned or poorly reinstated junctions: branch connections, particularly where plumbing and drainage trades worked at different stages of the build, that don’t sit quite true to the main line.
- Incorrect stormwater connections: downpipe or yard pit connections that don’t tie into the intended discharge point, sometimes only apparent once heavy rain reveals where water is actually ending up.
- Missing or incorrectly installed overflow relief gully: a fitting that’s meant to protect the house from sewer surcharge, sometimes omitted, undersized, or set at the wrong height relative to finished ground level.
None of these are necessarily obvious from the surface, and several of them (gradient issues in particular) can look completely fine for the first year or two of occupation before a slow drainage pattern starts to emerge.
When to get the inspection done
The strongest position is a CCTV inspection at or shortly after handover, before you’ve moved in and while the site is still fresh in everyone’s memory, this establishes a documented baseline and catches anything that’s already a problem before you’ve lived with it long enough for the cause to become murky. A second inspection later in the defect liability period, particularly if you notice any slow drainage, unusual dampness in the yard after rain, or a smell that wasn’t there before, gives you a second data point and keeps you well inside the window for raising a claim with the builder or the relevant home warranty insurer.
If you’re buying a near-new build rather than commissioning it yourself, the same logic applies from the buyer’s side: our guides to pre-purchase CCTV inspection and drain relining for pre-purchase inspections cover the due diligence angle in more depth, and a near-new property still within its statutory warranty period is exactly the kind of purchase where a drain inspection result can be handed straight to the vendor’s builder rather than becoming your problem to fix.
What to do if a defect is found
Where a CCTV inspection during the defect liability period identifies a genuine issue, the report and footage become your documentation for raising it with the builder. Most builders will address a defect covered by warranty directly rather than have it escalate to a formal home warranty insurance claim, particularly early in the defect period when the relationship is still active and the build file is fresh. Where a builder disputes the finding or has since gone out of business, the CCTV report and footage are exactly what’s needed to support a claim through the relevant state home warranty insurance scheme. Either way, the report needs to clearly show the defect location, its likely cause where that’s identifiable, and photographic captures from the footage, the same standard of documentation used for any pre-purchase or insurance-related inspection.
Frequently asked questions
How soon after handover should we get a drain inspection done? As early as practical, ideally at or shortly after handover while the site conditions and build details are still fresh. This gives you the strongest documented baseline and the longest possible runway within your warranty period if something is found.
Is it normal for a new sewer or stormwater line to have any defects at all? It’s more common than most new owners expect, mainly because of what happens on a construction site around a newly laid pipe rather than any fault in the pipe material itself. That’s exactly why a defect-period inspection is worth doing rather than assuming a new pipe is automatically problem-free.
Can construction debris in a new pipe cause a blockage months or years later, not right away? Yes. Debris sitting in a pipe can restrict flow gradually rather than causing an immediate blockage, so it’s possible for a new-build drainage issue to remain hidden for a year or more before it becomes noticeable at the surface.
What happens if we find a defect after our warranty period has ended? That’s a considerably harder position, since remediation generally becomes the homeowner’s cost once the relevant statutory or contractual window has closed. This is the core reason to inspect proactively during the warranty period rather than waiting for a visible problem to prompt the check.
Does a CCTV inspection during the defect liability period replace the need for a building inspection? No, they cover different things. A standard building inspection assesses visible structural and finishing elements; a CCTV drain inspection is a specialist check of the underground pipe system that a general building inspection doesn’t include.
Can relining fix a new-build drain defect, or does it need to be dug up and replaced? It depends on the specific defect. Gradient issues generally can’t be corrected by relining and may need the affected section re-laid. Cracked joints, minor displacement and some crushed sections can often be addressed with cured-in-place lining, the same no-dig approach used on older pipe systems, once a CCTV inspection has confirmed the extent of the issue.
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