Mould After a Leak or Flood: What to Do in the First 48 Hours

After a leak, flood, roof failure, or burst pipe, mould can begin developing quickly if building materials stay wet. The first 48 hours are important for reducing damage, odour, staining, and future contamination.

The priority is to stop the water source, make the area safe, remove standing water, dry affected materials, and assess whether plasterboard, timber, flooring, insulation, or contents have absorbed moisture. If drying is incomplete, mould may appear days or weeks later.

Immediate steps after water damage

• Turn off the water source or arrange urgent repair if the leak is ongoing.

• Ventilate safely, but avoid spreading contaminated dust if mould is already visible.

• Photograph damage for insurance or property records before disposal or cleaning.

• Use professional drying, moisture testing, and decontamination for larger incidents.

• Check hidden areas such as skirting, under flooring, behind cabinets, and ceiling voids.

Homes and businesses across London, Kent, and Surrey often need mould checks after storm leaks, bathroom escapes, appliance failures, and flood events. A specialist can confirm whether materials are dry enough and whether mould remediation is required.

Do not simply paint over staining after a leak. Confirm the structure is dry, treat any contamination, and fix the source before reinstatement.