1. Musty Odours That Won’t Go Away

A persistent, earthy smell – especially in bathrooms, kitchens, or near windows – is one of the first signs of mould growth. Even if you can’t see it, mould spores may be hiding behind tiles, drywall, or cupboards.

2. Unexplained Allergies or Respiratory Issues

It’s possible that mould is the source of your family’s sinus issues: sneezing or persistent coughs that get worse indoors. These symptoms are frequently confused with seasonal allergies or colds in the winter.

3. Peeling Paint or Wallpaper

Bubbling, cracking, or peeling paint can signal excess moisture behind walls – an ideal condition for mould growth. This is especially common in areas with poor ventilation, or where water ingress is occurring and may not be visible.

4. Condensation on Windows

Although condensation may not seem harmful, it is a powerful sign of high indoor humidity which is one of the main causes of mould.

Frequent damp or moisture on glass surfaces or walls is a warning sign for home and business owners to take quick action.

5. Dark Patches or Discolouration

Mould doesn’t always appear black. Different types of mould can be identified by green brown grey or even white discoloration on walls ceilings or textiles.