Who is responsible for black mold in bathroom grout?« Back to Previous Page

Black grout in a bathroom is almost certainly microbial growth, and in Dubai's high-humidity climate, it's a common issue. The responsibility for its repair depends on whether it's superficial or indicates a deeper problem.

Typically, a tenant's responsibility is for routine cleaning and upkeep. A landlord's responsibility is for structural repairs and issues stemming from building defects. If the black grout is purely surface mold caused by daily shower steam and inadequate ventilation—something regular cleaning should manage—it often falls to the tenant.

However, if scrubbing with bleach only provides a temporary fix, it suggests a persistent moisture problem beyond surface humidity. The issue could be leaking pipes within the walls, failed waterproofing behind the tiles, or poor sealing allowing water to seep underneath. These are structural defects and are unequivocally the landlord's responsibility to investigate and repair under standard tenancy laws.

Your first step is to formally notify your landlord in writing, detailing the issue and your failed attempts to clean it. Request they send a professional to assess the source of the moisture. Merely regrouting will not solve the problem if there is a leak or waterproofing failure; the underlying cause must be addressed. For a definitive answer, a professional inspection can identify if the moisture is condensation or a leak, which clarifies responsibility. In many cases, resolving this requires a contractor to remove tiles, repair the membrane, and re-tile, which is a major repair a landlord must authorize.