Reviewed and updated 7 October 2026 by Nick Roth, Mould Remediation Specialist, AllAces Cleaning & Restoration
In a Victorian rental, mould caused by the building is the rental provider’s problem. Mould caused by how the home is used is usually the renter’s. Since 29 March 2021, every room has had to be free from mould and damp caused by, or related to, the building structure.
The hard part is proving which one you’re dealing with. This guide covers what the law says, how to tell a building fault from a ventilation problem, and what renters and rental providers should each do next.
It applies across Victoria, from Melbourne terraces to weatherboards in Ballarat and the Central Highlands.
Key takeaways
- Building cause, provider pays. Leaks, failed waterproofing, rising damp and broken window frames sit with the rental provider.
- Usage cause, renter pays. Not using the exhaust fan or drying washing inside can shift responsibility to the renter.
- It can be an urgent repair. Mould or damp from the building structure that makes the home unsafe counts.
- Ventilation is a minimum standard. Bathrooms, laundries and toilets need ventilation that meets the Building Code.
- Evidence decides disputes. Photos, dates and a moisture-backed report carry the most weight.
- VCAT is the backstop. If you can't agree who pays, either side can apply.
What Victorian law says about mould in rentals
Short answer: the rental minimum standards make the building’s mould the provider’s responsibility, and Consumer Affairs Victoria says responsibility otherwise depends on the cause.
According to Tenants Victoria, each room must be free from mould and damp caused by, or related to, the building structure. Bathrooms, shower rooms, toilets and laundries also need ventilation that meets Building Code of Australia standards.
Consumer Affairs Victoria says mould or damp caused by the building structure is an urgent repair when it makes the property unsafe to live in. Renters should tell the rental provider as soon as they see signs of it.
| Rule | What it means in practice |
|---|---|
| Mould and damp minimum standard | Mould from the building structure must be fixed, not just cleaned |
| Ventilation minimum standard | Wet rooms need working ventilation to Building Code standard |
| Urgent repairs | Applies when structural mould or damp makes the home unsafe |
| Disputes | Either party can apply to VCAT if they can't agree who pays |
Building fault or how the home is used? How to tell
Short answer: follow the water. Mould that keeps coming back in the same spot, regardless of how 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 | Rental provider |
| Damp tide marks low on walls | Rising damp | Rental provider |
| Mould around a window that leaks in rain | Failed seals or frame | Rental provider |
| Bathroom ceiling mould, fan missing or broken | Ventilation below standard | Rental provider |
| Bathroom ceiling mould, working fan left off | How the room is used | Often the renter |
| Mould behind furniture on an outside wall | Condensation on a cold wall | Depends on insulation and use |
| Mould on clothes in a closed wardrobe | Indoor humidity | Often shared: airflow and heating |
Where it’s genuinely unclear, a mould inspection report with moisture readings and a named cause settles most arguments before they reach a tribunal.
Why Victorian homes are prone to mould
Short answer: cold winters, closed-up houses and older building stock.
Melbourne’s mould season runs through the colder months, when windows stay shut, heaters run and warm, moist air condenses on cold glass and walls. Period terraces and Edwardians add rising damp and limited wall insulation.
Ballarat and the Central Highlands get colder, longer winters, so condensation problems start earlier and last longer. Weatherboards with older windows and subfloors that don’t vent well are common culprits.
For work in either area, see how our local teams handle mould removal in Melbourne and mould removal in Ballarat.
What renters should do
- Photograph it with dates, including the wider room, the source if you can see it, and anything damaged.
- Tell the rental provider in writing as soon as you notice it, and keep a copy.
- Ask whether it’s an urgent repair if it’s spreading, affecting health, or making a room unusable.
- Don’t scrub or paint over large patches. You’ll spread spores and destroy the evidence.
- Get evidence if it’s disputed. Consumer Affairs Victoria says you may need proof the mould is dangerous, such as an occupational hygienist’s assessment or a medical report.
- Apply to VCAT if you still can’t agree who should pay.
VCAT’s residential tenancies list explains how to apply.
What rental providers should do
- Respond quickly. Mould spreads on wet material within 24 to 72 hours.
- Find the cause before you clean. A clean without a fix means a second call-out next winter.
- Check ventilation against the standard. A missing or dead bathroom fan is your problem, not the renter's.
- Fix the building, then remediate. Leaks, seals and drainage first, then proper mould remediation.
- Keep the paperwork. Inspection findings, invoices and clearance results protect you at VCAT and with insurers.
Which evidence carries the most weight
| Evidence | Good for | Limits |
|---|---|---|
| Dated photos | Showing extent and how it changed | Don't prove the cause |
| Written notice to the provider | Proving when they were told | Says nothing about who's at fault |
| Inspection report with moisture readings | Naming the cause and the fix | Costs money up front |
| Occupational hygienist assessment | Health risk and disputed claims | Slower and more expensive |
| Medical report | Linking the mould to a health effect | Doesn't identify the building fault |
Benefits of dealing with it early
Smaller job, smaller bill
Caught early, mould is often a clean and a fan, not new plasterboard.
Fewer disputes
A cause named early stops the blame game later.
Healthier home
People with asthma, allergies or weak immunity are most affected.
Bond protected
Clear records show the renter reported it and didn't cause it.
Safety while you wait for repairs
Short answer: clean small surface patches carefully, leave anything bigger to a professional, and keep vulnerable people out.
- Small, hard surfaces only. Under about a square metre on tiles or glass, a detergent wash with gloves and a P2 mask is usually fine.
- No bleach on porous surfaces. It fades the stain and leaves the growth.
- Ventilate and heat evenly. Short bursts of fresh air and steady heat cut condensation.
- Protect vulnerable people. Better Health Channel advises that people with asthma, allergies or weak immunity are most at risk.
For small patches, our step-by-step guide to removing mould yourself 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 Melbourne covers prices and who usually pays.
Why renters and providers call AllAces
35+ years on the tools
Restoration work across three states, including major flood events in Queensland, NSW and Victoria.
IICRC Certified Firm
Inspections and remediation to AS-IICRC S520:2025.
Reports that name the cause
Moisture readings and photos that hold up with providers, agents and VCAT.
Melbourne and Ballarat teams
Local crews across Melbourne, Ballarat and the Central Highlands.
Fix and verify
Containment, removal, drying and a check that it's back to normal.
Insurance-ready paperwork
Scope, readings and clearance in a format insurers accept.
FAQs
Is mould an urgent repair in Victoria?
It can be. Consumer Affairs Victoria says mould or damp caused by the building structure is an urgent repair when it makes the property unsafe to live in.
Who pays for mould removal in a Victorian rental?
It depends on the cause. Building faults like leaks, rising damp or below-standard ventilation sit with the rental provider; mould caused by how the home is used can fall to the renter. If you can’t agree, either side can apply to VCAT.
What counts as mould caused by the building?
Anything traced to the structure: roof or plumbing leaks, failed waterproofing, rising damp, leaking window frames, or wet rooms without ventilation that meets the Building Code.
Do I need a professional report to prove it?
Not always, but it helps when the cause is disputed. For urgent repairs, Consumer Affairs Victoria says you may need proof the mould is dangerous, such as an occupational hygienist’s assessment or a medical report.
The bottom line
In Victoria, the question is always the cause. Document it early, report it in writing, and get the cause named before anyone argues about the bill.
If you need that cause named, book mould inspection and testing with our Melbourne or Ballarat team.
This guide is general information, not legal advice. It’s reviewed every three to six months. Next review due January 2027.
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.
