Most mould disputes between landlords and tenants in NSW don’t reach a tribunal. They’re resolved, or should be, through communication, documented requests and reasonable responses within the timeframes set out in the Residential Tenancies Act 2010. When they do escalate, the path runs through NSW Fair Trading and then the NSW Civil and Administrative Tribunal (NCAT). This guide explains how the process works for both parties.
The Legal Framework
The primary legislation governing residential tenancy mould disputes in NSW is the Residential Tenancies Act 2010 (RTA). Key provisions:
Section 52, Landlord’s obligation to maintain. Landlords must maintain the premises in reasonable repair, having regard to the age and character of the premises. This is the foundational obligation that mould disputes rely on.
Section 63, Urgent repairs. Certain repairs are defined as urgent because not doing them creates risk to health or safety. Mould affecting health, particularly for vulnerable occupants, can qualify as an urgent repair. Urgent repairs must be attended to within 24 hours if life-threatening, or as soon as possible for other urgent cases.
Section 65, Tenant obligations. Tenants must keep the property reasonably clean and use the premises in a reasonable manner. This section is used by landlords who argue mould was caused by tenant behaviour. Whether tenant behaviour is genuinely causative requires evidence.
Fair Trading Act 1987 and Australian Consumer Law, if the property was leased in a state that was not fit for habitation, these consumer protection laws may also apply.
Step 1: Written Notice and Request
Before any escalation, a written notice to the other party is required. Without this documented request and response (or non-response), Fair Trading and NCAT have limited tools to assist.
Tenant issuing notice to landlord: Write a clear letter or email to the landlord or property manager that:
- Describes the mould, its location and when it was first noticed
- Attaches photographs with dates
- References the landlord’s obligation under s52 RTA
- States that the property is not in reasonable repair
- Requests specific remediation action within a specified timeframe (14-28 days is reasonable for non-urgent mould; shorter for health-affecting situations)
- States that if no action is taken, you will escalate to Fair Trading
Keep a copy of every communication.
Landlord issuing response to tenant: Respond in writing to every tenant mould report, even to decline. A response that attributes the mould to tenant behaviour should reference the specific behaviour and the basis for this conclusion. Silence is a dangerous strategy, tribunals take a dim view of landlords who failed to respond to documented repair requests.
Step 2: NSW Fair Trading
If a written request produces no response or an unsatisfactory response, Fair Trading is the next step. Fair Trading can:
- Mediate between the parties (a free dispute resolution service)
- Investigate complaints about serious or repeated breaches
- Issue formal directions in some circumstances
Contact: fairtrading.nsw.gov.au or 13 32 20
Fair Trading mediation is confidential and non-binding, both parties must agree to any outcome. It resolves a significant proportion of residential tenancy disputes without tribunal involvement. For mould disputes, it’s most effective when both parties are willing to engage and the scope of work is agreed in principle.
Fair Trading mediation is also a prerequisite for many NCAT applications, you should either attempt mediation or have a clear reason why it was not feasible (e.g. landlord refuses to participate).
Step 3: NCAT (NSW Civil and Administrative Tribunal)
The NCAT Tribunal provides a formal binding determination. For residential tenancy matters, NCAT’s Consumer and Commercial Division handles applications from both landlords and tenants.
Tenant Applications
A tenant can apply to NCAT for:
- Order for repairs, requiring the landlord to carry out mould remediation within a specified time
- Compensation, for costs incurred (alternative accommodation, medical expenses, property replacement) resulting from the landlord’s failure to remediate
- Rent reduction, for the period the property was not in reasonable repair
- Termination, in serious cases, a tenant may apply to terminate the tenancy if the property is not in a reasonable state of repair and the landlord has failed to remedy
Application fee: $25-$52 depending on the type of claim (as at 2026).
Landlord Applications
A landlord can apply to NCAT for:
- Compensation from the tenant if the tenant is found to have caused the mould through their conduct
- Orders related to the tenancy where the tenant has breached their obligations
What NCAT Expects as Evidence
The most common reason mould disputes fail at NCAT is insufficient evidence. Both parties should bring:
Physical evidence:
- Dated photographs of the mould
- Laboratory reports if mould testing has been conducted
- Professional inspection reports from a qualified mould inspector
- Before-and-after photos if any treatment was done
Documentary evidence:
- All written communications (text, email, letters) about the mould
- Copies of the tenancy agreement and condition report
- Invoices and quotes for remediation work
- Medical certificates or reports if health effects are part of the claim
- Plumber, builder or inspector reports identifying the cause of moisture
Expert evidence: A mould inspection report from a qualified inspector that identifies the location and cause of mould is the single most valuable piece of evidence in a tribunal. It establishes objective facts about conditions, moisture sources and remediation needs that are difficult to dispute. Commissioning an independent inspection before filing an NCAT application is strongly recommended.
NCAT Timeframes
From application to hearing: typically 4-12 weeks for standard matters. Complex matters or those requiring expert evidence may take longer. Emergency injunctions for urgent health-related situations can sometimes be heard within days.
Compensation That Can Be Claimed
| Type of Compensation | Examples | Evidence Required |
|---|---|---|
| Alternative accommodation | Hotel bills, temporary rental costs | Receipts, booking confirmations |
| Medical expenses | GP visits, medication | Medical certificates and receipts |
| Property damage | Mould-affected clothing, furniture | Itemised list with values, photos |
| Rent reduction | Weekly rent × weeks affected | Establish the impairment period |
| Remediation cost (DIY/professional) | Cleaning products, contractor invoice | Receipts |
Key Points for Landlords
The most common landlord errors in mould disputes:
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Attributing mould to tenant behaviour without evidence. Saying “the tenant caused the mould” without evidence of what specific behaviour and why it caused the condition is not persuasive at NCAT.
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Not responding to written requests. Documented non-response is the strongest evidence a tenant can produce. Always respond in writing.
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Using DIY or inadequate remediation. If you send someone with a bottle of spray bleach in response to a serious mould complaint, and the mould returns, your NCAT position is very weak.
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Ignoring the moisture source. Remediating visible mould without addressing what caused it demonstrates, to both the tenant and a tribunal, that you’re not making a genuine effort to resolve the problem.
Key Points for Tenants
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Document everything from the first sign of mould. Photographs with dates, written notifications, responses received.
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Don’t delay reporting. If mould worsens because a tenant waited months to report it, the landlord may have a partial answer to a compensation claim.
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Don’t withhold rent. Withholding rent as a bargaining tool without NCAT authorisation is a breach of the tenancy agreement and weakens your position significantly.
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Get a professional inspection report. Self-taken photos are necessary but not sufficient for a significant NCAT claim. A professional report carries much more weight.
Frequently Asked Questions
How long does an NCAT mould dispute take to resolve? From filing to hearing, typically 6-16 weeks for a standard tenant application for repairs. Emergency matters can be expedited. If the matter is contested and requires evidence from experts, allow 3-6 months for a final determination.
Can I stop paying rent if my rental has severe mould? Withholding rent without NCAT authorisation is not recommended, it constitutes breach of your tenancy obligations and gives the landlord grounds to terminate the tenancy. You can apply to NCAT for a rent reduction, which, if granted, effectively reduces your legitimate rent obligations going forward. Consult a tenants’ advice service before taking any rent action.
My landlord says the mould is because I don’t ventilate, who has to prove this? Both parties present evidence at NCAT and the tribunal weighs it. The landlord asserting tenant-caused mould should have evidence supporting this, for example, inspection reports showing no structural moisture sources, only lifestyle-driven condensation. A mould inspection report that identifies a specific moisture source (failed DPC, roof leak, waterproofing failure) is strong counter-evidence for the tenant.
Is there a cost to the tenant for NCAT applications? The application fee is $25-$52 for most residential tenancy matters. If you require legal representation, solicitor costs apply, though many NCAT tenancy hearings are conducted without lawyers. Tenants’ advice services (Tenants’ Union of NSW) can help you prepare your case.
Can a landlord evict a tenant for complaining about mould? Retaliatory eviction, ending a tenancy because a tenant exercised their legal rights to request repairs, is prohibited under the RTA. If a landlord issues a termination notice shortly after a mould complaint, a tenant can apply to NCAT to have the termination notice invalidated.
Need a professional mould inspection report to support a dispute? Contact Illawarra Mould Removal for documentation-quality inspection and reporting across the Illawarra region.