Gradual damage disputes are climbing at New Zealand’s insurance ombudsman at the same time residential repair costs have reached a post-Covid peak – a convergence of pressures that puts the adequacy of standard policy caps into question.
The pattern is illustrated by a case in which a New Zealand man put his foot through his bathroom floor after stepping out of the shower and was left with a fraction of his repair costs covered. When he pulled up the tiles, he found the subfloor saturated by a water leak. He lodged a claim, and his insurer confirmed a leak had taken place. The dispute turned not on whether water had entered the structure, but on how long it had been there. The insurer concluded the leak predated the 72-hour threshold that typically separates sudden damage from gradual deterioration under standard house insurance policy wordings, and capped the payout at the gradual damage benefit – a figure RNZ reports most house policies set at between $2,000 and $5,000, applying only to leaks originating from internal pipes or systems.
The policyholder pushed back, arguing that medium-density fibreboard (MDF) – the material used in the subfloor – breaks down rapidly on contact with moisture, indicating the structural failure had occurred quickly. The Insurance and Financial Services Ombudsman Scheme (IFSO Scheme) did not accept that reasoning. To trigger coverage under the main policy rather than the capped benefit, the ombudsman found the damage had to be both instantaneous and complete at the moment of loss. Evidence of a hidden leak and mould pointed to water that had been acting on the subfloor over an extended period. The insurer’s decision stood.
Insurance and Financial Services Ombudsman Karen Stevens said the case reflects a fundamental misalignment between policyholder expectations and the way house insurance responds to hidden damage. “The key issue is the gap between what people expect and what policies cover. Many people expect that, if they suddenly discover damage in their house, their insurer will pay to fix it. However, insurance only covers sudden damage, not damage that occurs over time and may have been discovered suddenly. It is the cause of the damage, rather than its discovery, that has to be sudden,” Stevens said.
Minor leaks left unrepaired and internal guttering systems that conceal water ingress until structural deterioration has set in are among the scenarios most likely to result in a claim being classified as gradual. Stevens flagged both as common sources of disputes. “Signs like mould or a small ongoing leak can point to gradual damage. It’s important to fix leaks quickly, as leaving them unresolved can lead to further damage that probably won’t be covered. Damage is usually gradual with hidden water damage. Things like internal guttering can make any problems harder to spot and can cause serious damage before you know there’s a problem,” she said.
A second case before the IFSO Scheme followed a different path to the same conclusion. A couple discovered cracked walls, dislodged tiles, and a gap between a kitchen benchtop and a wall following a storm, and lodged a claim. The insurer declined, finding the physical evidence pointed to long-term ground movement rather than storm force. Wear and tear, earth movement, faulty construction, or pre-existing conditions were identified as the more likely causes. The insurer also cancelled the policy after establishing the couple had not disclosed defects documented in a pre-purchase builder’s report.
The IFSO Scheme upheld both the decline and the cancellation. The storm had not caused the damage – it had made pre-existing damage visible. Stevens said weather-related claims carry a specific evidentiary burden that policyholders often underestimate. “If you’re claiming for damage after a weather event, you need to show a clear link between the event and the damage. Insurance won’t cover issues that were already there before the event happened. Long-term issues like foundation movement are usually not covered,” she said.
For those disputing a gradual damage classification, Stevens said independent professional evidence is the most effective basis for a challenge. “If you’re disputing a claim decision to do with gradual damage, we recommend you engage an expert to provide evidence on what caused the damage. Expert reports can be critical in resolving disputes, especially where there’s a question about what caused the damage and when it happened,” she said.
Gradual damage now accounts for 6% of disputes the IFSO Scheme has accepted for formal investigation this financial year, up from 5% the prior year, and has featured in the top five dispute categories for two consecutive years, according to the IFSO Scheme’s 2025 Annual Report. Across all categories, the scheme accepted 600 disputes in the year ending June 30, 2025 – a 25% increase on the previous year and roughly double the 285 recorded in 2022. House insurance led all categories at 24% of disputes.
The numbers behind that premium pressure reflect the same underlying cost pressure. According to the Insurance Council of New Zealand (ICNZ) Annual Review 2024, published in April 2025, the cost of repairing or rebuilding a home is 20% higher than it was before the Covid-19 pandemic, and New Zealand’s extreme weather has contributed to a 30% rise in global reinsurance premiums. Gross written premium for domestic buildings and contents across ICNZ member insurers grew from $1.93 billion in 2020 to $3.16 billion in 2024 – a 64% increase in four years. ICNZ members have also agreed to provide data for an evidence-based underinsurance report – an acknowledgment that the adequacy of existing cover levels is a question the industry has yet to formally answer.
Cotality’s Cordell Construction Cost Index (CCCI) for Q4 2025, published in January 2026, reinforces that picture. Annual residential building cost growth reached 2.3% – still below the long-term average but sitting on a cost base that remains elevated after annual growth peaked at more than 10% in late 2022, driven by supply chain disruptions and wage pressures. For underwriters and product teams, this sustained cost environment raises a question the data makes harder to avoid: when gradual damage benefit caps of $2,000 to $5,000 were set, did they reflect the cost of remediating a water-damaged subfloor at 2025 prices?
Insurers that have not reviewed gradual damage benefit levels or their claims communication approach since before 2022 may find themselves increasingly exposed – facing dispute volumes that have doubled in three years against a cost environment that has fundamentally changed the financial stakes of every declined claim.
