Does Home Insurance Cover Mould?

Mould is only covered by home insurance when it arises directly from a covered event. Gradual mould, endemic mould, and mould arising from condensation or poor ventilation are excluded from almost all standard Australian home and contents policies under the gradual deterioration exclusion.

• Covered: mould from a sudden water damage event. If a burst pipe, storm, cyclone, or roof failure caused water to enter the property and mould subsequently developed, the mould remediation is typically claimable as part of the water damage claim. The triggering event must be covered under your policy.
• Not covered: gradual or pre-existing mould. Mould arising from long-term moisture, poor ventilation, or maintenance neglect is excluded under the gradual deterioration clause in most standard policies. This includes bathroom mould, condensation mould, and mould in unventilated roof cavities.
• The 48-hour rule in tropical and subtropical climates: In Queensland, Northern Territory, and northern WA, mould can establish within 48 hours of a water event. Document and lodge as soon as mould is discovered — delaying can give insurers grounds to argue the mould is not contemporaneous with the claimed event.
• Rental properties — additional obligations: Landlords in Queensland, New South Wales, and Victoria have an obligation under Residential Tenancies legislation to remediate mould regardless of insurance outcome. Landlord insurance may cover event-caused mould; check your PDS and engage a certified contractor to document the cause.

Always check your Product Disclosure Statement for the specific mould and gradual deterioration clauses in your policy before lodging.

The critical requirement for a mould insurance claim is establishing the causal chain: covered event → water damage → mould. Without documentation of each link, your insurer will dispute coverage. This is where most mould claims fail — not because coverage is absent, but because the chain cannot be proven.

• Link 1 — The covered event: Document the event date and nature with Bureau of Meteorology data (for storms and cyclones), plumber's report (for burst pipes), or building inspection report (for roof or structural failure). Timestamped photos of damage correlating with the event strengthen this link.
• Link 2 — Water damage from that event: Show that water entered the property as a direct result of the covered event. Photos of water entry points, water lines, and saturated materials at the time of the event are the primary evidence.
• Link 3 — Mould from that water damage: An IICRC-certified mould assessment documenting the species, location, and likely cause of the mould — with reference to the documented water event — closes this link. A psychrometric drying log from the original restoration (if one was completed) shows whether drying reached target moisture content.
• The absent drying log problem: If no drying log exists from the original restoration (because non-certified tradespeople performed the work), insurers will argue that the mould arose from incomplete drying that was the homeowner's responsibility — not from the original event. An independent IICRC-certified assessment can still support your claim, but the case is harder to make without contemporaneous records.

Mould claims are among the most frequently denied and disputed categories in Australian home insurance. Insurers use several standard tactics to avoid coverage — knowing them in advance lets you prepare your counter.

• Tactic: "pre-existing mould": Insurers may claim the mould existed before the covered event. Counter with pre-event inspection records, real estate photographs, or a pre-purchase building inspection showing no mould. Your insurer bears the burden of proving the pre-existing exclusion applies.
• Tactic: "gradual deterioration": If there is any gap between the water event and when mould was discovered, insurers may argue it developed gradually. An IICRC-certified assessment documenting the typical growth timeline for the mould species and conditions (particularly in tropical climates) is the most effective counter.
• Tactic: "failure to mitigate": Insurers may argue the homeowner failed to take reasonable steps to prevent mould after the water event. Counter by documenting the steps taken immediately after the event — extraction, drying equipment deployed, claims lodged promptly — or by demonstrating that mitigation was not possible (e.g., inaccessible roof cavity).
• AFCA mould disputes: Mould claim denials are a common AFCA category. Lodge with AFCA within 2 years of the claim decision if Internal Dispute Resolution is unsuccessful. Policyholders who provide IICRC-certified causal chain documentation have significantly stronger outcomes. AFCA is free and its determinations are binding on insurers.

IICRC-certified documentation may support your claim at insurer and AFCA level, though outcomes cannot be guaranteed.