Black grout and damp smell: professional cost and DIY fix?« Back to Previous Page

Black grout and a persistent damp smell in a Dubai villa suggest active mould growth, likely due to the high humidity and condensation from showers and air conditioning. This is a common issue here. The spread behind fixtures indicates it's more than surface-level; the mould has probably penetrated the porous grout and may be growing on the wall substrate behind the tiles.

For a minor, surface-only patch, a DIY approach with a dedicated mould-removing product and rigorous scrubbing can work. However, given the smell and spread you describe, a DIY fix will likely only provide a temporary solution. The root cause is persistent moisture, and the mould is almost certainly deeper than you can reach. Improper cleaning can aerosolize spores and spread the problem.

A professional assessment is necessary to determine the extent of the damage behind the tiles. The cost for professional remediation is not fixed; it depends entirely on the square footage affected and the depth of the infestation. Treating a small, contained area is a straightforward job, while addressing mould that has spread into the wall cavity behind the tiles is a more involved project that requires containment, removal of affected materials, and addressing the moisture source.

The critical first step is a proper diagnosis to understand the scope. A reputable company will use moisture meters and possibly borescope cameras to inspect behind walls without unnecessary demolition. They should provide a clear scope of work and cost estimate based on that assessment, not a generic package price. Always request that they identify and rectify the source of the moisture, as simply cleaning without doing this guarantees the mould will return.