Green Mould in Your Home: Causes, Risks, and Removal

Green mould is one of the most common types found in Adelaide homes, yet many homeowners underestimate how quickly it can spread and the health problems it can cause. If you’ve spotted green patches growing on walls, food, or damp surfaces, here’s what you need to know.

What Causes Green Mould?

Green mould is typically Aspergillus, Cladosporium, or Penicillium — all of which thrive in humid environments with temperatures between 15–30°C. Adelaide’s winter months create ideal conditions when homes are sealed up, heating is running, and condensation builds on cold surfaces.

Common locations include bathrooms, kitchens, window frames, and anywhere with poor airflow. In Adelaide’s older homes across Norwood and Unley, green mould frequently appears on exterior walls that don’t get enough sunlight.

Health Risks of Green Mould

While green mould is generally less dangerous than black mould, it can still cause significant health problems — especially for people with allergies, asthma, or weakened immune systems. Symptoms include persistent coughing, sneezing, skin irritation, and eye discomfort. Learn more about mould health risks.

When to Call a Professional

If green mould covers an area larger than one square metre, is growing on porous materials, or keeps returning after cleaning, it’s time for professional assessment. A qualified specialist can identify the species, assess the extent of contamination, and address the underlying moisture source.

Take our mould risk assessment to understand whether your home is at elevated risk.