Foundation Repair Warranty Claims: When Movement Returns

You paid for underpinning, the cracks were made good, and everyone moved on. Then a year or two later, the same wall starts cracking again, or a door that closed properly for a while has started sticking once more. Before assuming the whole repair failed, it’s worth understanding that “movement returned” covers a range of situations, some of which are a legitimate warranty claim against the original contractor, and some of which are new causes the original repair was never meant to guard against. This guide walks through how to tell the difference and how to build a claim that actually holds up.

First, work out what kind of movement you’re actually seeing

Not all returning movement means the underpinning failed. Three broad patterns account for most cases:

1. The same wall or corner is cracking again, in the same location as before. This is the pattern most likely to point to a genuine workmanship or design issue: insufficient pins, pins that didn’t reach stable ground, or a design that didn’t account for the true depth of reactive clay on your block.
2. A different part of the house has started moving, somewhere the original underpinning didn’t cover. This can be entirely unrelated to the original repair, a new drainage problem, a new leak, or ground conditions in an area that simply wasn’t part of the original scope.
3. The repaired zone looks fine, but new cosmetic cracking has appeared nearby. This is often the house settling back into a new equilibrium after being lifted, or ordinary seasonal articulation cracking unrelated to the structural repair at all.

Getting an independent read on which of these you’re dealing with is the first and most important step, and it’s a separate exercise from getting the original contractor’s opinion, since they have an obvious interest in reading it as anything other than their own workmanship.

Why “movement returned” isn’t automatically a warranty claim

Our guide to foundation repair warranties and guarantees covers the statutory and private warranty landscape in full, but the short version matters here: under the Home Building Act 1989 (NSW), residential building work carries a statutory six-year warranty for major defects. That warranty covers defective work, meaning the underpinning wasn’t installed to the design or standard it should have been. It does not cover new causes of movement that arise after a properly executed repair, a tree planted since the repair, a new leak, a drainage change, or an entirely separate part of the footing that was never part of the original scope.

This distinction is exactly why most warranty terms, and the statutory warranty itself, hinge on cause. If the contractor did not install the correct number or depth of pins as specified by the engineer, that’s a workmanship issue and a legitimate claim. If a downpipe someone redirected after the repair is now discharging against a different wall, that’s a new moisture problem, and even a generous warranty is unlikely to cover it.

Building your case: what you need before you contact the contractor

A warranty dispute is far more likely to resolve in your favour, and far faster, if you show up with documentation rather than a description over the phone.

• The original engineering documentation. The pin schedule, the depth specified, the soil report if one was done, and the completion certificate or engineer’s sign-off. If you weren’t given these at completion, request them now, they should exist regardless.
• Photos and dates of the new movement. Photograph the crack or the affected area with a scale reference (a coin or tape measure), and photograph it again in a month if it isn’t urgent, to show whether it’s static or actively growing.
• A record of anything that’s changed on the property since the repair. New landscaping, a tree removed or planted, a change in irrigation, a renovation nearby, or any plumbing work. This context helps an independent assessor separate a workmanship issue from a new cause.
• The original contract and warranty document. Look specifically at what’s excluded and how a claim is meant to be lodged. Our guide to how underpinning quotes are built explains what a properly itemised original quote should have specified, which matters if the dispute becomes about what was actually agreed to.

Getting an independent assessment

Whenever practical, arrange an independent structural or geotechnical engineer’s assessment before re-engaging the original contractor, or at minimum, alongside them. An assessment from someone with no stake in the outcome carries far more weight if the matter becomes a formal dispute, and it gives you a plain-English answer on cause before you commit to a position. This costs money upfront, but it is typically modest relative to the underpinning job itself, and it protects you from either accepting a weak excuse from the original contractor or wasting money pursuing a claim that genuinely isn’t a workmanship issue.

The claims process, step by step

1. Document the new movement with photographs, dates and, if there’s time to spare, a short monitoring period using a crack gauge or dated plaster patch.
2. Pull the original paperwork: engineering design, completion certificate, contract and warranty terms.
3. Get an independent assessment of what’s causing the new movement and whether it relates to the original scope.
4. Contact the original contractor in writing, referencing the warranty terms, the assessment findings, and what you’re asking them to do. A written record matters if the matter escalates.
5. Allow a reasonable response time and get their proposed remedy in writing before agreeing to any further work.
6. If unresolved, escalate to NSW Fair Trading. Statutory warranty disputes for residential building work can be lodged with NSW Fair Trading, which can facilitate resolution or direct you toward the Home Building Compensation Fund process if the original contractor cannot or will not remedy the defect.

When the original contractor has closed down

If the business that did the underpinning no longer exists, the statutory warranty doesn’t disappear, but recovering costs in practice becomes harder. NSW Fair Trading can advise on options, and in some circumstances the Home Building Compensation Fund provides a pathway, though it typically applies to specific insolvency scenarios rather than every contractor closure. This is one of the clearest arguments for choosing a contractor with an insurance-backed guarantee in the first place, since that protection survives the original business closing in a way a purely private warranty does not.

What if the assessment finds it’s a new cause, not a warranty issue?

If an independent assessment concludes the new movement stems from a genuinely new cause, a leak, a drainage change, a tree, or ground conditions outside the original scope, that’s disappointing news but it isn’t necessarily bad news: it usually means the original underpinning is still doing its job, and the new problem is often smaller and cheaper to address on its own than the original repair was. Treat it as a fresh diagnosis rather than folding it into a dispute that the evidence doesn’t support.

Foundation warranty claim FAQs

How long do I have to make a warranty claim after underpinning?

Under NSW law, major structural defects carry a six-year statutory warranty from completion, regardless of what any private warranty document says. Non-major defects carry two years. Check your specific contract too, since a private warranty may offer longer terms for certain components.

Do I need an engineer’s report before I can make a claim?

It’s not always a strict legal requirement, but in practice it’s close to essential. Without independent evidence of cause, a dispute usually comes down to your word against the contractor’s, and an assessor’s report is what actually moves a claim forward.

What if the contractor blames drainage or a tree I planted?

That’s a legitimate defence if it’s true, since most warranties exclude new moisture sources introduced after the repair. It’s exactly why an independent assessment matters: it tells you whether that explanation holds up or is being used to avoid a genuine workmanship issue.

Can I withhold payment on a related job until this is sorted?

That depends entirely on your specific contract and circumstances, and it’s a legal question rather than a foundation-repair one. Get advice from NSW Fair Trading or a solicitor before withholding payment on any related contract.

Is it worth pursuing a small warranty claim, or should I just pay for the fix myself?

That depends on the cost of the fix relative to the cost and time of pursuing a claim. For a modest repair, sometimes it’s genuinely faster to pay and move on. For anything approaching the cost of a fresh underpinning job, the claims process, while slower, is usually worth pursuing.

Get an independent read on what’s happening

If movement has returned after underpinning and you’re not sure whether it’s a warranty issue or something new, get a free quote and, if a contractor is confirmed for your area, an independent local specialist will be arranged to assess the cause and put the findings in writing, giving you a solid basis for whatever comes next.