In NSW, responsibility for mould in a rental generally follows the cause. If the mould stems from the property itself — a leaking roof, rising damp, a broken exhaust fan, inadequate ventilation built into the building — it is usually the landlord’s job to fix, because NSW tenancy law requires rentals to be provided and maintained in a state fit for habitation. If the mould results from how the property is used — windows never opened, steam never vented, clothes dried indoors daily — the tenant may bear responsibility. Most real cases sit somewhere in between, which is why cause matters more than blame.
That’s the short version. Below is the practical detail — who typically pays, what the law says, the steps to take as a tenant or landlord in Wollongong, Shellharbour or Kiama, and where an independent inspection report fits when the two sides disagree.
A caveat before we start: we’re mould remediation specialists, not lawyers, and nothing here is legal advice. NSW Fair Trading and the Tenants’ Union of NSW publish current guidance on renting and repairs, and rules change — check the current position before relying on it.
Who is typically responsible? Scenario by scenario
| Scenario | Typically responsible | Why |
|---|---|---|
| Mould present when the tenant moved in | Landlord | Premises generally must be fit for habitation at the start of a tenancy |
| Roof leak, burst pipe or rising damp causing mould | Landlord | Structural and plumbing faults are repair issues, not cleaning issues |
| Broken or missing bathroom exhaust fan, mould follows | Landlord | Ventilation the property is supposed to provide isn’t working |
| No openable windows or built-in ventilation in a wet area | Landlord (often) | Fit-for-habitation standards address ventilation — check current guidance |
| Tenant never ventilates, dries washing inside daily, mould develops | Tenant (often) | Moisture generated by use, with working ventilation available but unused |
| Mould after storm or flood damage (e.g. an east-coast low) | Landlord to repair | Storm damage repair generally sits with the owner; timing obligations apply |
| A mix — old damp building and low ventilation habits | Shared / disputed | The most common real-world case in older Illawarra rentals |
Treat this table as a starting point, not a ruling. Outcomes depend on the specific facts, the tenancy agreement and current law — NSW Fair Trading and, if needed, the NSW Civil and Administrative Tribunal (NCAT) decide contested cases, not a mould company and not a property manager’s opinion.
What NSW tenancy law says (in careful terms)
Under the Residential Tenancies Act 2010 (NSW), landlords are generally required to provide and maintain rental premises in a reasonable state of repair and fit for habitation. NSW introduced a set of minimum habitability standards — covering things like structural soundness, ventilation and drainage — that give that phrase practical teeth. Persistent damp and mould problems caused by the building commonly fall under repairs and maintenance rather than cleaning.
Three points worth knowing, all of which you should verify against current NSW Fair Trading guidance:
- Mould can qualify as an urgent repair. NSW guidance indicates that mould or damp caused by or related to the building structure — a burst pipe, serious water penetration, severe storm damage — can fall within the urgent repairs category, which carries faster response obligations than routine repairs.
- Tenants have a limited self-help option for urgent repairs. Where a repair is genuinely urgent and the landlord or agent can’t be reached or won’t act, tenants may in some circumstances arrange it themselves and seek reimbursement up to a capped amount — confirm the current cap with NSW Fair Trading before spending anything.
- There’s a dispute ladder. Written request first, then NSW Fair Trading’s free dispute resolution, then NCAT — which can order repairs, compensation or rent adjustments. Keep paying rent throughout; withholding rent can put the tenancy at risk.
The Illawarra context makes all of this more common than in drier parts of NSW. Older double-brick and weatherboard rentals from Corrimal to Thirroul often have marginal subfloor ventilation, escarpment suburbs cop some of the highest rainfall in the state, and even newer rental stock around Shellharbour and Flinders sees winter condensation. Cause is genuinely ambiguous here more often than either side expects.
Tenants: a step-by-step checklist
- Report it in writing, immediately. Email or message your property manager or landlord the day you notice mould. Verbal reports are hard to prove later; a dated email starts the clock.
- Photograph everything with dates. Wide shots of each affected room, close-ups of the growth, and photos of any likely cause — water stains, dripping taps, a fan that doesn’t spin, permanently fogged windows.
- Describe the suspected cause, not just the stain. “Mould on the bedroom ceiling below the roof valley, worse after rain” gets a faster, better-targeted response than “there’s mould.”
- Do your part in the meantime. Ventilate when weather allows, run working exhaust fans, wipe small patches on hard surfaces, avoid drying washing indoors unventilated. This protects the property — and protects you against a claim that your habits caused the problem.
- Follow up in writing if nothing happens. A reasonable timeframe depends on severity; structure-related mould after water penetration may be urgent. Reference your first report and ask for a repair date.
- Escalate through the proper channels. If the landlord won’t act, contact NSW Fair Trading about dispute resolution, and consider an NCAT application for repair orders. The Tenants’ Union of NSW and local tenants’ advice services can help with the process.
- Get independent evidence if the cause is disputed. An independent mould inspection and moisture investigation that identifies the actual moisture source — leak versus condensation versus rising damp — is often the single most useful document in a stalemate, because it replaces opinion with findings.
Landlords and property managers: your side of it
If you own or manage rentals in the Illawarra, mould reports deserve a fast, structured response — for three practical reasons beyond the legal obligations.
- Small mould problems become big ones quickly here. A slow roof leak left over winter can turn a $600 ceiling treatment into a multi-room remediation — our cost guide shows how steeply the numbers climb once growth reaches cavities and porous materials.
- Cause determines liability, so establish it early. An independent inspection that documents the moisture source protects you as much as the tenant. If the report shows lifestyle-driven condensation with working ventilation, you have evidence. If it shows a building fault, you know exactly what to fix — once, properly.
- Fix the source or you’ll pay twice. Approving a “mould clean” without fixing the leak, fan or drainage problem behind it means the next tenant reports the same patch within months. Proper remediation addresses cause and growth together, aligned with recognised industry standards such as IICRC S520.
Health authorities such as NSW Health recommend addressing mould and damp in homes — a sensible baseline for any property you’re responsible for, whatever the legal allocation of a particular case turns out to be.
A realistic Illawarra example
An illustrative composite, not a real case. A tenant in a 1960s double-brick unit in Corrimal reports black mould on a south-facing bedroom wall in July. The property manager’s first instinct is condensation — “please ventilate more.” The tenant’s first instinct is a building fault. Both dig in.
An independent moisture investigation finds elevated moisture readings at the base of the wall, blocked weep holes, and garden beds built up against the external brickwork — moisture is entering through the wall, and no amount of window-opening would have prevented it. The landlord arranges drainage and weep-hole rectification through licensed trades, the wall is treated professionally, and the dispute ends without a tribunal hearing. Total cost: far less than a contested NCAT process plus a spreading mould problem.
That’s the pattern we see repeatedly: the inspection resolves the argument, because it answers the only question that matters — where is the moisture coming from?
Where professional help fits
In a rental dispute, the most useful document is an independent inspection report — moisture readings, likely source, photos and a recommended scope of works. From there, properly documented treatment follows: a bathroom and ceiling job after a fan replacement, or full remediation with a standards-aligned written scope suited to the tenancy file or an insurance claim. We work with tenants, private landlords and property managers across Wollongong, Shellharbour and Kiama, and we report findings straight either way — a report only has value if it’s independent.
Frequently asked questions
Who pays for mould removal in a NSW rental?
Usually whoever is responsible for the cause. Building-related moisture — leaks, structural damp, failed ventilation — generally points to the landlord; moisture generated purely by how the tenant lives in the property may point to the tenant. Disputed cases are decided through NSW Fair Trading dispute resolution or NCAT, not by either party unilaterally. Check current NSW Fair Trading guidance, as rules and interpretations change.
Is mould an urgent repair in NSW?
It can be. NSW guidance indicates mould or damp caused by or related to the building structure — such as serious water penetration or a burst pipe — may fall within the urgent repairs category, which carries faster obligations. Routine condensation mould is more likely treated as a standard repair or maintenance matter. Confirm the current urgent repairs list with NSW Fair Trading.
Can I withhold rent until the landlord fixes the mould?
Withholding rent is risky and can jeopardise your tenancy. The safer path is to keep paying rent while pursuing repairs in writing, then through NSW Fair Trading and NCAT, which can order repairs, compensation or rent adjustments. Get advice from a tenants’ advice service before taking any unilateral step.
Can I break my lease because of mould in NSW?
In serious cases tenants may have options to end a tenancy, but the rules are specific and getting it wrong can be costly. Seek advice from NSW Fair Trading or a tenants’ advice service before ending an agreement — and gather evidence first, ideally including an independent inspection report identifying the cause and extent.
The property manager says the mould is my fault. What now?
Ask for the basis of that view in writing, and consider an independent moisture investigation. If the source is a building fault — a leak, rising damp, a non-functional fan — the report will show it; if it genuinely is ventilation habits, it will show that too, along with practical fixes. Our prevention guide for coastal Illawarra homes covers the habits side.
Do you work directly with property managers?
Yes. We provide inspections, reports and remediation for rental properties across the Illawarra, with written scopes and documentation suited to tenancy files and insurance claims.
Get an independent answer on a rental mould problem
Whether you’re a tenant who needs evidence, a landlord who needs the cause found and fixed once, or a property manager stuck in the middle — an independent inspection is usually the fastest way through. Call (02) 0000 0000 or use our Get a fast quote form with a few photos and the property’s suburb, and we’ll give you honest next steps, whichever side of the lease you’re on.