What Does Mould Smell Like? Identifying Hidden Mould in Your Home

You can’t see it, but you can smell it — that persistent musty, earthy odour that seems strongest in certain rooms or corners of your home. If you’re catching whiffs of something damp and stale in your Adelaide home, you may have hidden mould.

The Telltale Mould Smell

Mould produces volatile organic compounds (MVOCs) as it grows and digests organic materials. These compounds create the distinctive “musty” smell most people associate with old basements or damp buildings. The smell is often strongest in:

• Bathrooms and laundries with poor ventilation
• Bedrooms near exterior walls (especially south-facing)
• Wardrobes against cold walls
• Subfloor spaces and crawl spaces
• Behind large furniture that restricts airflow

Why Hidden Mould Is More Dangerous

Mould growing inside wall cavities, under flooring, or behind cabinetry is releasing spores into your living space without any visible warning. The smell is your body’s early detection system — don’t ignore it. Mould exposure health risks can be significant, especially with prolonged hidden exposure.

Where to Check in Adelaide Homes

Adelaide’s older housing stock is particularly prone to hidden mould. Check behind wardrobes on external walls, in roof cavities above bathrooms, inside subfloor spaces, and around windows where condensation collects. Homes in Adelaide Hills and Mitcham should pay special attention to subfloors due to higher ground moisture.

If you smell mould but can’t find it, professional mould testing with air quality sampling can confirm the presence and type of mould spores in your home.