Mould is a common issue in Australian homes during winter—but who’s responsible when it appears in a rental? Understanding your rights and responsibilities as a tenant or landlord is crucial to prevent mould-related disputes.
Key Takeaways
- Mould in rentals during winter is often caused by excess moisture and poor ventilation.
- Landlords are responsible for structural defects and necessary repairs that contribute to mould.
- Tenants are responsible for day-to-day ventilation and cleaning to help prevent mould growth.
Table of Contents
Why Mould Is a Problem in Winter
Mould thrives in moist, poorly ventilated environments—conditions that are all too common during the colder months. Condensation from heating, closed windows, and limited airflow can create the perfect breeding ground for mould, particularly on walls, ceilings, and window frames.
Not only is mould unsightly, but it can also cause health issues like asthma, respiratory irritation, and allergies. Left unchecked, it can even damage the property’s structure and reduce its value.
Prevention Tips: How to Keep Mould Out of Your Home
Whether you’re a tenant or an owner, mould prevention is a shared responsibility. Here are some simple ways to stop mould from developing:
- Ventilate your home daily. Open windows, even for 15 minutes a day, especially in bedrooms and bathrooms.
- Use exhaust fans when cooking or showering.
- Keep indoor temperatures consistent. Avoid big fluctuations that lead to condensation.
- Dry clothes outside or use a vented dryer.
- Wipe down wet surfaces, like bathroom tiles and windowsills, to remove moisture before mould can form.
- Invest in a dehumidifier if the home tends to be damp.
By building these habits into your routine, you can reduce the conditions that encourage mould growth—even in winter.
Who Is Responsible for Mould in a Rental?
Responsibility for mould in rental properties depends on the cause. In general, landlords must provide and maintain a safe, habitable property, while tenants are expected to keep the property clean and well-aired.
Here’s a breakdown:
| Mould Cause | Who’s Responsible? | Example |
| Leaking pipes, rising damp, roof leaks | Landlord | Mould caused by a leaking roof needs landlord action |
| Poor property design or lack of ventilation | Landlord | No exhaust fan in bathroom contributes to mould |
| Infrequent cleaning or airing of rooms | Tenant | Mould on bathroom tiles from not using exhaust fan |
| Drying clothes inside without ventilation | Tenant | Tenant uses heater + drying rack without airflow |
When the Landlord Is Responsible
- Structural issues, like a leaking roof or rising damp
- Plumbing leaks or flooding due to faulty infrastructure
- Lack of ventilation due to poor property design
- Providing a home that is not fit for habitation at the start of the tenancy
When the Tenant Is Responsible
- Failing to ventilate the home by opening windows or using fans
- Drying clothes indoors without proper airflow
- Not reporting leaks or signs of damp in a timely manner
- General neglect or poor cleanliness leading to mould
The key is to determine whether the mould is due to a maintenance issue or tenant behaviour.
When to Contact Your Property Manager
Mould is not something to ignore—it can get worse quickly. If you notice mould in your rental:
- Document it: Take photos and note where and when it appeared.
- Identify the likely cause: If it’s a leak or structural issue, the landlord must act.
- Contact your property manager immediately if:
- There’s water damage or leaks involved
- You’ve tried cleaning but mould returns
- The home has poor ventilation with no exhaust fans
- You’re unsure of the cause
Your property manager acts as the go-between for landlords and tenants. The sooner you get them involved, the better the outcome—for everyone.
Final Thoughts
Winter mould in rentals can often be avoided with some simple ventilation and cleaning strategies. But when mould stems from property defects or lack of maintenance, the responsibility falls squarely on the landlord’s shoulders. Clear communication and early action are key. Tenants and landlords both have a role to play—so don’t wait for a small mould patch to become a big problem.