Insurance, subsidence and underpinning claims

The general exclusion

Australian home insurance policies almost universally exclude damage caused by gradual ground movement. The wording varies — "settlement", "subsidence", "earth movement", "shrinkage", "erosion" — but the principle is consistent: slow, progressive movement of the ground under your house is treated as wear and maintenance, part of owning a building on soil, not a sudden insured event. A house that has settled over years on reactive clay, with cracks that opened gradually as the ground dried, is squarely inside that exclusion, and a claim framed that way will be declined.

This surprises a lot of homeowners, so it is worth saying plainly: if the cause is seasonal soil movement, poor drainage or tree roots, the underpinning bill is almost certainly yours. What you can control is whether you spend it well — start with do I actually need underpinning? and the cost guide.

When you may be covered

The exclusion has edges. Policies cover listed sudden events, and if one of those events caused the ground movement, the resulting damage may be claimable even though generic settlement is not. The classic example is escape of liquid: a burst or long-leaking pipe washes soil out from under a footing and the corner drops. The movement wasn't gradual geology — it was a plumbing failure, which is a listed event on most policies. Storm and flood damage that undermines footings can fall the same way, depending on your policy's flood terms.

The distinction is entirely about cause, not symptoms. The same 8 mm stair-step crack can be a declined maintenance issue or an accepted claim, decided by what moved the soil. The logic is identical for stump homes, covered separately in restumping and insurance.

How assessors decide

When you lodge a subsidence-related claim, the insurer's question is not "how bad is the damage?" but "what caused it?". Expect an assessor, often followed by a builder or engineer engaged by the insurer, whose job is cause attribution. If their report says seasonal moisture variation in reactive clay, the exclusion applies. If it says soil loss consistent with the documented pipe failure, you are in covered territory — though policies differ on how much of the fix they fund, and rectification of the leak itself is often treated separately from the resulting damage.

Timing evidence matters enormously here: damage that appeared quickly after an identifiable event argues for coverage; cracks documented as growing slowly for years argue against it.

Running a claim properly

If you suspect a covered cause, build the file before anyone touches anything.

• Photograph the damage early, with dates and a tape measure or coin for scale, and record crack widths in millimetres
• If a leak is suspected, get a plumber to locate it and report in writing on its position and likely duration — keep the failed pipe section if it's cut out
• Commission your own engineer's report on the cause of movement, not just the fix
• Notify the insurer promptly and don't repair anything beyond emergency make-safe before their assessment
• Keep every report, quote and receipt

That engineer's opinion is the heart of the claim. An independent professional attributing the movement to a specific sudden event is the strongest card a homeowner holds.

Disputes and AFCA

If the claim is declined and you believe the cause was a listed event, ask for the decision in writing and for the assessor's and expert reports it relied on, then lodge a complaint through the insurer's internal dispute resolution process. If that fails, the Australian Financial Complaints Authority (AFCA) is the free, independent escalation path for insurance disputes, and cause-of-damage arguments backed by a credible independent engineer are exactly the contests it exists to hear.