ChatGPT · New Zealand
Will house insurance cover a leak that's been getting worse for months? Do NZ insurers differ on this?
In New Zealand, a house insurance claim for a leak that has been getting worse over months is often difficult, but it depends on what caused the leak, whether it was hidden, and your insurer’s policy wording. NZ insurers do differ. AMP
The key distinction is usually:
- Sudden and accidental damage (for example, a pipe suddenly bursts and floods part of the house) is commonly covered.
- Gradual damage (for example, a slow leak that has been occurring for months, causing rot, mould, or deterioration) is commonly excluded unless the policy has a specific gradual/hidden damage benefit. AMP
A few examples:
- Hidden leaking pipe inside a wall: Some NZ policies cover the resulting damage (such as damaged walls or floors), often with limits, but may not cover fixing the pipe itself. AMI Site
- Leaking shower, failed sealant, roof leak, or maintenance issue: These are more likely to be treated as gradual damage, wear and tear, or lack of maintenance and may not be covered. AMP
- You noticed the leak getting worse but did nothing: An insurer may argue you had a duty to minimise further damage, which can affect the claim outcome. Some policies expressly require you to take reasonable steps once damage is discovered. Home
Do NZ insurers differ?
Yes. Differences commonly include:
- Whether they offer hidden gradual damage cover automatically or as an option.
- The maximum amount they will pay (some policies have relatively low sub-limits).
- What counts as a qualifying leak (for example, an internal water pipe versus a shower or roof).
- Whether they cover costs to locate the leak, and under what circumstances. AMI Site
Examples of different approaches:
- AMI Insurance policies include a hidden gradual damage benefit for certain hidden internal pipe leaks, subject to conditions and limits. AMI Site
- NZI policies describe cover for hidden gradual damage discovered during the period of insurance, with limits and conditions. NZI Site
- Tower Insurance also provides hidden gradual water damage cover in some policies, with limits and exclusions. Tower Insurance NZ
If you have a leak now, practical steps are:
- Stop or reduce the source of the leak if you safely can.
- Take photos/videos before repairs.
- Notify your insurer promptly (even if you are unsure whether it will be covered).
- Do not remove damaged materials unnecessarily unless needed to prevent further damage, and keep evidence.
If you tell me where the leak is coming from (roof, shower, pipe in wall, bathroom, window, etc.), how long you knew about it, and which insurer/policy you have, I can help you assess how it is likely to be treated.
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Captured 11 October 2026