Mould insurance claims are among the most contested in the Australian residential insurance market. Unlike a stolen car or fire damage, mould exists in a grey zone where insurers frequently dispute causation, question the extent of damage, and rely on policy exclusions to limit payouts. For Northern Rivers homeowners, many of whom experienced the 2022 floods and subsequent mould problems, understanding how the insurance system handles these claims can mean the difference between full remediation funding and a denied claim.
Quick answer (BLUF)
Most standard home and contents policies in NSW cover mould as a consequence of a sudden, insured event (burst pipe, storm damage, flood if specifically covered). Mould resulting from gradual moisture accumulation, maintenance failures, or ventilation inadequacy is typically excluded. The 2022 Northern Rivers flood claims revealed that flood vs storm coverage distinctions, and mould as a secondary consequence of flooding, created significant contention with many insurers.
The fundamental insurance distinction: sudden event vs gradual process
This distinction drives the vast majority of mould claim outcomes in NSW.
Covered scenario: A pipe bursts in your kitchen overnight. By morning there is significant water damage to the cabinetry and adjoining wall. Professional drying is arranged, but over the next 10 days mould develops in the wall cavity. You claim on your home policy. This mould is a direct consequence of the insured event (sudden burst pipe), most policies cover both the water damage and the resulting mould remediation.
Excluded scenario: Over several years, inadequate bathroom ventilation allows humidity to accumulate in the ceiling and wall spaces. Mould gradually develops. You claim on your home policy. This mould results from a gradual process (inadequate maintenance) rather than a sudden insured event, most policies exclude this.
The grey zone: Your roof has a slow leak that started 6 months ago. You didn’t notice until the ceiling began to stain and mould appeared. The leak resulted from a damaged tile that cracked during a previous storm. Is this covered? This is genuinely contested, some insurers argue it’s a gradual process; others accept it as a consequence of storm damage. How you document and present the claim matters enormously.
The 2022 Northern Rivers flood experience
The 2022 floods revealed systemic problems with mould claim handling in the Northern Rivers that triggered significant regulatory scrutiny. Key issues included:
Flood vs storm coverage distinction: Many policies covered storm damage but not flood damage. Where floodwaters caused the initial damage, insurers argued mould was a consequence of a non-covered flood event. Whether water entered a property via storm-driven overland flow (storm damage) or inundating floodwater (flood damage) became the subject of thousands of disputes.
Mould as secondary vs primary loss: Some insurers sought to argue that mould was a separate, subsequent event rather than a consequence of the covered flood damage, attempting to apply mould exclusions even where the initial flood entry was covered.
Assessment quality and delays: The scale of the 2022 claims overwhelmed insurer assessment capacity. Properties sat water-damaged and unassessed for weeks, during which mould developed and spread. Insurers sometimes then disputed the extent of mould damage as disproportionate to the initial damage.
The Insurance Council of Australia and the Australian Financial Complaints Authority (AFCA) received significant complaints from Northern Rivers policyholders. Many claims were eventually resolved in policyholders’ favour through AFCA after initial rejection.
The scrutiny became formal: the House of Representatives Standing Committee on Economics ran a federal parliamentary inquiry into insurers’ responses to the 2022 major floods claims, and its October 2024 report found systemic failures in claims handling, including delays, poor communication and inconsistent expert assessments, and made recommendations for reform. If your 2022-flood mould claim was rejected or under-scoped, that inquiry’s findings are useful context for a review request or an AFCA complaint. (Section reviewed July 2026.)
How to maximise your mould insurance claim
Document the sudden insured event thoroughly: Photograph the initial damage immediately, before any clean-up. Record the date and time. Keep emergency repair receipts. The clearer the link between the insured event and the subsequent mould, the stronger your claim.
Report promptly: Most policies require prompt reporting of damage. Delayed reporting, particularly where delay contributed to the extent of mould development, gives insurers a basis to argue the damage was worsened by failure to mitigate.
Get an independent professional assessment early: A professional mould inspection report commissioned before remediation begins provides independent documentation of the extent and likely cause of mould. This is far more useful in a disputed claim than a remediator’s quote alone. The inspection report should specifically address whether the mould pattern is consistent with the insured event (e.g., consistent with water entry from a specific direction, consistent with flooding rather than long-term humidity accumulation).
Don’t start remediation until insurer has inspected: Contact your insurer before commencing remediation and allow them to inspect. Starting work before insurer inspection can give rise to arguments about the original extent of damage. However, note that you also have a duty to mitigate ongoing damage, take emergency protective measures but document the state before they are taken.
Use the Insurance Council’s Complaints processes: If your claim is denied and you believe this is incorrect, AFCA is the primary resolution body. AFCA decisions are binding on insurers. For flood-related mould claims in Northern Rivers, AFCA has significant experience with the 2022 event complexities.
Reviewing your policy: what to look for
Before a claim arises, review your policy for:
- Flood cover: Is flooding explicitly covered? Note that “flood” in insurance has a specific legal definition (usually involving overflow of waterways) distinct from “storm” damage. Many standard policies require specific flood endorsement.
- Mould exclusion clause: Most policies have some form of mould exclusion for gradual accumulation. Check how broadly it is written, does it exclude all mould, or specifically mould “resulting from gradual deterioration or inadequate maintenance”?
- Mould sub-limit: Some policies cover mould but apply a sub-limit (e.g., mould coverage capped at $10,000 regardless of overall policy limit). This is critical to understand in advance of a major claim.
FAQs
My mould claim was denied. What should I do?
Request the specific policy clause the insurer is relying on for the denial, and their written reasons. If you believe the denial is incorrect, lodge a complaint with AFCA (Australian Financial Complaints Authority). AFCA provides free dispute resolution and has binding authority over insurers. You do not need a lawyer to lodge an AFCA complaint.
Does my strata/apartment building insurance cover mould from a leak in my building?
Building insurance in strata covers the building structure. Mould in a lot (apartment) resulting from a building defect, a leaking roof, failing waterproofing, or burst pipe in common areas, is typically a claim against the strata building insurance, not the lot owner’s contents insurance. The strata manager and body corporate committee are your starting point for these claims.
The insurer is offering to pay for only surface treatment of flood mould. Is that reasonable?
No, post-flood mould that has penetrated into building materials requires the removal of those materials. Surface treatment alone is not adequate remediation for flood mould and will not produce a lasting result. If an insurer’s recommended scope is inadequate, request a second professional opinion and document why the proposed scope is insufficient. This is a negotiating point that AFCA has assessed in favour of policyholders in similar disputes.
How long do I have to make a mould claim after the damage occurs?
Check your policy, most home insurance policies in NSW require you to report damage “as soon as practicable” after becoming aware of it, and many have explicit time limits on claims (commonly 30 days for the initial report). Mould that developed gradually over years before being noticed is particularly difficult to claim on timeliness grounds. Mould discovered shortly after an insured event (storm, burst pipe) should be reported immediately.