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Documenting mould as a NSW tenant is the practical foundation for everything that follows: repair requests, rental reduction claims, and NCAT applications if it gets to that. Good tenant mould evidence nsw means systematic photos, a written log, and repair requests in writing with clear timelines. This guide is practical building documentation advice only; it is not legal advice. For legal questions, the NSW Fair Trading, repairs and maintenance information and the Tenants’ Union of NSW are the right resources. Start your mould in rentals NSW reading before anything else if you are new to this situation.
What good photo evidence looks like
A single blurry photo of a wall is not evidence. A systematic set of photos taken the same way each time is. When documenting mould for a repair request or potential NCAT use, take photos at three distances for each affected area.
Wide shot: the whole room or wall face showing the location of the mould in context. This establishes where in the property the issue is.
Mid shot: the affected section from about 1-2 metres away, showing the extent of the growth.
Close shot: the mould surface up close, ideally with a ruler, tape measure or coin in frame for scale.
For each session, also photograph:
- The room number or location clearly (a door number, a window, the room name on a map you sketch)
- Any visible water staining, tide marks, or damp surfaces associated with the mould
- The current conditions: condensation on windows, wet surfaces, any obvious source
Timestamp and location data: most smartphones automatically embed the date and time into photo metadata. Do not edit the photos in any way that would alter the metadata. If you want to add a visible date, take a photo of today’s newspaper or a handwritten date card in frame with the mould.
Repeat this process every two to four weeks, or more often if the mould is visibly spreading. A dated series showing mould growing over time is more persuasive than a single set taken all at once.
The moisture log
Alongside photos, keep a written log. A simple spreadsheet or even a notebook works. Record:
- Date and time
- Weather conditions (heavy rain, high humidity, normal)
- Room temperature and humidity if you have a cheap hygrometer (widely available for under $20 at hardware stores)
- Visual observation: is the mould the same, worse, or spreading?
- Any condensation on surfaces
- Any times you noticed the smell was stronger
This log builds a picture of how the mould is developing and whether it is correlated with weather events, ventilation, or seasonal patterns. It is also evidence of when you were aware of the problem, which matters for establishing your landlord’s obligation timeline.
If you are in a strata apartment and believe the source is in common property, our mould in strata apartments NSW guide explains the additional documentation steps for that situation.
Writing the repair request properly
An email or letter to your property manager is the foundation of your evidence trail. A verbal conversation does not create a paper trail. Every repair request about mould should be in writing.
What to include:
- The date of the letter or email
- The property address and your tenancy details
- A clear description of the mould: which rooms, what surfaces, approximate area
- When you first noticed it and how it has changed since
- Any steps you have already taken (ventilating, cleaning surface mould)
- A specific request for repair within a reasonable time
- Reference to your rights under the Residential Tenancies Act 2010 (the landlord is required to keep the property in a reasonable state of repair)
- An attachment of your photos (the set from the same visit, not all historical photos in one dump)
Use a tone that is matter-of-fact and professional. The goal at this stage is to give the landlord a clear opportunity to fix the problem. Emotional language or threats are counterproductive at this point.
Keep a copy of every email and letter you send. If using email, use one email address consistently and keep all mould-related correspondence in a single folder.
Our landlord mould checklist NSW covers the landlord’s obligations from the other side, which is useful to understand before you frame your request.
When to escalate to NSW Fair Trading
If the landlord or property manager has not responded within a reasonable time, or has refused to repair mould that is a structural or habitability issue, escalation is the next step.
NSW Fair Trading tenancy services offer:
- Informal dispute resolution assistance
- Formal complaint lodgement
- Referral to NCAT where a dispute cannot be resolved
Before escalating, ensure you have:
- A documented repair request in writing with the date sent
- Evidence the landlord received it (read receipt, delivery confirmation, or a record of handover)
- A log showing the mould was reported and not repaired within a reasonable time
- Your photo documentation series
Do not withhold rent as a way of pressuring action on mould. This creates a separate breach of your tenancy agreement and can complicate your position significantly. Seek advice from the Tenants’ Union of NSW before taking any step that changes the financial relationship with your landlord.
When an independent inspection tips the scales
There are situations where an independent mould inspection report significantly strengthens a tenant’s position:
- The landlord disputes the extent of the mould
- The landlord claims the mould is caused by the tenant’s behaviour rather than a building defect
- The property is a strata apartment and it is unclear whether the source is in the lot or common property
- The NCAT application requires documented evidence of the source and extent
- An insurance claim is involved and documentation of the source is needed
An independent inspection report with moisture readings, source identification, and photographs is objective evidence that carries weight in dispute resolution. It is harder for a landlord or an NCAT assessor to dismiss than tenant photos alone, not because the photos are inadequate, but because the professional assessment adds a qualified opinion on cause.
The cost of an independent inspection is often modest relative to the cost of ongoing mould exposure or the outcome of an unresolved NCAT dispute. If you are considering an NCAT application over a significant mould issue, it is worth the investment.
For mould in a shared rental or student accommodation in the Illawarra, see our mould in share houses and student rentals guide for additional considerations.
Contact us if you need an independent mould assessment to support a tenancy dispute or repair request.
FAQs
Can photos from my phone be used as NCAT evidence?
Yes. Smartphone photos are routinely accepted as evidence in NCAT tenancy disputes. What matters is that they are clear, timestamped and systematic. A well-organised photo log showing progressive development of mould over time is more persuasive than a single day’s photos.
My landlord says the mould is my fault because I don’t ventilate enough. What do I do?
This is a common landlord response. The relevant question is whether the property has adequate ventilation infrastructure: exhaust fans in bathrooms and kitchens, adequate opening windows, and no structural moisture sources. If the property lacks adequate ventilation or has a structural moisture problem, tenant behaviour is unlikely to be the sole cause. An independent inspection can identify whether the source is structural or behavioural.
How long does a landlord have to repair mould in a NSW rental?
There is no fixed number of days in the legislation for non-urgent repairs. “Reasonable time” is the standard, and it depends on the nature of the problem. Mould that affects habitability or poses a health risk would typically be treated as urgent. If a landlord has not responded within 14-21 days of a written request for a significant mould issue, seeking further assistance from NSW Fair Trading is reasonable.
Can I claim a rent reduction while the mould is not fixed?
A rent reduction or compensation for diminished amenity is something NCAT can order if the landlord has failed to keep the property in a reasonable state of repair. You cannot simply reduce your own rent payments without NCAT’s approval. Apply to NCAT for the order rather than unilaterally reducing your payment.
Do I need a professional mould report or are my photos enough?
For a straightforward case where the mould is clearly visible, clearly documented, and the landlord’s failure to repair is evident, your photos and written log may be sufficient for NCAT. For contested cases, particularly where cause is in dispute or the source is unclear, a professional inspection report adds significant weight.