Reviewed and updated February 2026 by Nick Roth, Mould Remediation Specialist, AllAces Cleaning & Restoration
In a Queensland rental, black mould caused by the building or by normal use of the property is the owner’s responsibility. Mould caused by the tenant’s own actions is the tenant’s. Since 1 September 2024, every general tenancy has had to be free from vermin, damp and mould, unless the tenant caused it.
Tenants worry about their health and their bond. Owners and property managers worry about liability and the repair bill. Both sides need the same thing: the cause, in writing.
This guide covers what the law says, how to tell a building fault from a lifestyle cause, and what tenants and owners should each do next.
Key takeaways
- The standard names mould. Rentals must be free from vermin, damp and mould unless the tenant caused it.
- Structural cause, owner pays. Leaking roofs, failed shower membranes and plumbing leaks.
- Reasonable use, owner pays too. A leaking showerhead is the property failing, not the tenant.
- Tenant's actions, tenant pays. Steam build-up without using the ventilation provided.
- Tell the property manager fast. Tenants must report mould as soon as possible.
- QCAT is the backstop. Evidence about the cause decides disputes.
What Queensland law says about mould in rentals
Short answer: the minimum housing standards make mould the owner’s problem unless the tenant caused it.
According to the RTA’s minimum housing standards, a rental must be free from vermin, damp and mould, except where the tenant caused it. If mould appears during a tenancy, the tenant must notify the property manager or owner as soon as possible.
The RTA gives three examples. Mould from a leaking roof is structural and sits with the owner. A leaking showerhead is reasonable use and also sits with the owner. Mould from steam build-up where the tenant didn’t ventilate or clean the area sits with the tenant.
| Rule | What it means in practice |
|---|---|
| Free from vermin, damp and mould | Mould must be fixed, not just cleaned, unless the tenant caused it |
| Applies to all general tenancies | In force for every general tenancy since 1 September 2024 |
| Tenant must report | Notify the property manager or owner as soon as possible |
| Disputes | Either side can apply to QCAT if they can't agree |
Building fault or lifestyle? How to tell
Short answer: follow the water. Mould that keeps coming back in the same spot, however the room is used, usually points to the building.
| What you see | Likely cause | Usually whose job |
|---|---|---|
| Mould spreading from a ceiling stain | Roof leak or plumbing above | Owner |
| Mould at the base of a shower wall, loose tiles | Failed waterproofing membrane | Owner |
| Bathroom with no window and no working fan | Ventilation not provided | Owner |
| Mould under eaves or in wall cavities after rain | Overflowing gutters | Owner |
| Bathroom ceiling mould, working fan never used | Tenant's actions | Often the tenant |
| Mould behind furniture pushed against walls | Airflow blocked, condensation | Often the tenant |
| Mould on clothes in a closed wardrobe | Humidity and airflow | Often shared |
Where it’s genuinely unclear, a mould inspection report with moisture readings and a named cause settles most disputes before they reach QCAT.
Why Queensland rentals are prone to mould
Short answer: humidity, storms and housing that holds moisture.
South-east Queensland spends much of the year at humidity that mould thrives in. Summer storms and floods wet buildings that then take months to dry, and elevated timber homes with open subfloors feed moisture into floors.
For local work, our mould removal in Brisbane team handles rentals across Brisbane, Ipswich and Logan.
What tenants should do
- Report it in writing to the property manager as soon as you see it, with photos and dates.
- Move belongings away from the affected area to protect them.
- Use the ventilation you have: exhaust fans, windows and wiping condensation.
- Don’t paint over it or scrub large patches. You’ll spread spores and lose the evidence.
- Ask for an inspection if you think it’s a leak and the owner disagrees.
- Apply to QCAT if you still can’t agree. QCAT’s residential tenancy disputes page explains how.
What owners and property managers should do
- Act fast. A small patch now can be a full wall replacement next month.
- Find the cause before you clean. Cleaning without fixing the leak means a second call-out.
- Check ventilation. A windowless bathroom without a working fan is the owner's issue.
- Don't paint over it. Paint hides mould for a few weeks, then it peels and the dispute starts again.
- Keep the paperwork. Reports, invoices and clearance results protect you at QCAT and with insurers.
Our guide for property managers covers briefing a restoration contractor and preventing mould between tenancies.
Which evidence carries the most weight
| Evidence | Good for | Limits |
|---|---|---|
| Dated photos | Showing extent and change over time | Don't prove the cause |
| Written notice to the property manager | Proving when it was reported | Says nothing about fault |
| Inspection report with moisture readings | Naming the cause and the fix | Costs money up front |
| Repair and maintenance records | Showing known leaks or past fixes | Often incomplete |
Safety while you wait
Short answer: clean small surface patches carefully, leave anything bigger to a professional, and keep vulnerable people away.
Wear gloves and a P2 mask, never mix bleach with vinegar, and keep anyone with asthma or a weak immune system out of the room. After floods or long wet spells, the Queensland Government’s mould after a disaster advice covers safe clean-up.
For small patches, our step-by-step guide to removing mould covers what works on each surface.
What it costs
Cost depends on the cause, how much material has to come out, and access. Our guide to mould removal costs in Brisbane covers current price ranges. These are estimates; the final price varies with the severity of the mould infestation.
Why tenants and owners call AllAces
35+ years on the tools
Restoration work across Queensland, NSW and Victoria since 1988.
IICRC Certified Firm
Inspections and remediation to AS-IICRC S520.
Reports that name the cause
Readings and photos that hold up with owners, agents and QCAT.
Brisbane team
Our Murarrie facility covers Brisbane and surrounds.
Fix and verify
Containment, removal, drying and a check it's back to normal.
Insurance-ready paperwork
Scope, readings and results in a format insurers accept.
FAQs
Is the landlord responsible for mould in Queensland?
Yes, if it’s caused by structural problems or reasonable use of the property, such as a leaking roof or a leaking showerhead. If the tenant’s own actions caused it, the tenant is responsible.
What do I do if my property manager ignores mould?
Keep reporting it in writing with photos and dates. If you still can’t agree, you can try the RTA’s dispute resolution service and then apply to QCAT.
Can I lose my bond because of mould?
Possibly, if the mould was caused by your own actions, like not using the ventilation provided. Written reports and an inspection naming the cause protect you if it wasn’t.
Does black mould mean the property is unsafe?
Not on its own; the colour doesn’t decide the risk. The amount of growth, where it is, and who lives there matter more. Keep vulnerable people away and get it assessed.
The bottom line
In Queensland, the cause decides who pays. Report mould early, keep records, and get the cause named before anyone argues about the bill.
If you need that cause named, book mould inspection and testing with our Brisbane team.
This guide is general information, not legal advice. Check the current rules with the RTA.
About the author
Nick Roth, Mould Remediation Specialist, AllAces Cleaning & Restoration
Nick has been with AllAces for more than six years and is our most experienced mould remediation specialist. He completed Decon Systems’ Mould Remediation for Technicians course in August 2021. Technicians in every state we work in call on him for the hardest mould testing and remediation jobs, including work with specialised equipment such as Hydroxyl machines.
