Mold Resources — Everything You Need to Know About Mold in Dubai

Visual Signs

Dark spots or patches on walls, ceilings, or around window frames — often black, green, grey, or white. Paint bubbling, peeling, or blistering on walls and ceilings. Discolouration around AC vents, bathroom grout, or under sinks. Warped or swollen skirting boards and window sills. Any visible growth on soft furnishings, carpet edges, or inside wardrobes.

Smell

A persistent musty, earthy, or damp odour — often described as "wet basement" or "old books." The smell is caused by microbial volatile organic compounds (MVOCs) released by active mold colonies. If the smell intensifies when AC is running, the source is likely inside the HVAC system. If it is localised to one room, the source is typically within the walls, ceiling, or under flooring of that room.

Hidden Mold Indicators

Not all mold is visible. Hidden mold grows inside wall cavities, behind tiles, under flooring, inside AC ductwork, and in ceiling voids — producing spores and MVOCs without any visible evidence. Warning signs of hidden mold include: persistent allergy-like symptoms that worsen indoors, unexplained humidity spikes in specific rooms, condensation on windows or cold surfaces, and recurring musty odours with no visible source. Professional thermal imaging and air quality testing are the definitive methods for confirming hidden mold.

When to Call a Professional

If visible mold covers an area larger than 30 cm × 30 cm, if mold keeps returning after cleaning, if you suspect hidden mold behind walls or in HVAC systems, if occupants are experiencing health symptoms, or if the property has had a water leak or flooding event — professional assessment is recommended. DIY cleaning treats the surface but does not address the moisture source, which means mold will return.