Battling Winter Mould in Sydney: A Practical Guide for Your Home

Sydney’s winters might be mild, but they bring a hidden challenge that most of us face: Mould.

Cool temperatures, rainy days, and reduced airflow create the perfect environment for mould to thrive—especially in older homes or poorly ventilated spaces. Beyond being unsightly, mould can cause allergies, respiratory issues, and even structural damage if left unchecked.

In this blog, we’ll explore why mould becomes a problem in Sydney’s winter, how to prevent it, and what to do if it shows up in your home.

Why Mould Thrives in Sydney During Winter

When homes are closed up to keep the heat in, indoor humidity levels rise—particularly in areas like bathrooms, kitchens, and laundry rooms.

Common places mould grows:

• Bathroom ceilings and tile grout

• Window frames and sills and window coverings

• Inside wardrobes and cupboards

• Behind furniture against cold walls

• Ceilings and corners

If your home feels “damp” or smells musty, mould is likely on its way.

1. Ventilation Is Key

To stop mould before it starts, focus on airflow:

• Open windows for at least 10–15 minutes daily, even in winter.

• Use exhaust fans in bathrooms and kitchens.

• Consider a dehumidifier in bedrooms or living areas.

• Avoid drying clothes indoors—or run a fan or open a window if you do.

• Leave wardrobes and cupboard doors slightly open to let air circulate.

2. Keep Humidity in Check

The goal is to keep your indoor humidity below 60%. Sources of moisture in winter include:

• Steamy showers

• Indoor clothes drying

• Condensation on windows

• Leaks

Simple solutions:

• Wipe down wet surfaces daily

• Use moisture absorbers like DampRid or charcoal bags

• Use dehumidifier’s

3. Smart Heating Helps

Cold surfaces attract condensation. The solution? Keep your rooms consistently warm, but use the right kind of heating:

• Avoid unflued gas heaters—they release water vapor.

• Choose electric panel heaters or reverse-cycle air conditioners where available

4. How to Clean Mould Safely

If you spot mould, you need to act quickly.

For hard surfaces:

• Spray with undiluted white vinegar

• Let it sit for 1 hour

• Wipe clean with a cloth

• Repeat weekly if needed

Avoid using bleach—it often masks mould rather than killing it.

For fabrics:

• Wash with hot water and detergent

• Dry in full sunlight

• For delicate items, spot clean with diluted vinegar

We are always here to help so please feel free to give us a call to further discuss.