Damp and Mould in London Rental Properties: Landlord Duties Under Awaab Law

What Awaab Law Requires of Private Landlords in London

The provisions commonly referred to as Awaab Law were originally introduced into social housing regulation through the Social Housing (Regulation) Act 2023 in response to the death of two-year-old Awaab Ishak in a Rochdale housing association property where persistent mould growth had been reported repeatedly to the landlord without adequate response. The Renters Rights Act 2024 extends equivalent provisions to the private rented sector, meaning that private landlords in London are now subject to the same statutory hazard remediation timeframes that apply to social housing providers.

Under the Awaab Law provisions, a landlord who receives a report of a hazard in their property must investigate the reported hazard and provide the tenant with a written explanation of the findings within twenty-eight days. If the investigation confirms the presence of a damp or mould hazard, the landlord must provide a written remediation plan within a further period set by regulations and must commence and complete the remediation works within the timeframes specified. For hazards that pose an urgent risk to health, including severe mould growth that is causing or is likely to cause respiratory harm, the investigation and remediation must begin within a much shorter timeframe, with regulations specifying periods as short as twenty-four hours for emergency hazards.

Distinguishing Condensation Mould from Structural Damp in London Properties

One of the most significant practical challenges for London landlords responding to damp and mould complaints is distinguishing between condensation mould, which arises from inadequate heating and ventilation in the property, and structural damp arising from defects in the building fabric. This distinction matters because the remediation approaches and, in some cases, the allocation of responsibility differ. Condensation mould is caused by water vapour in the air condensing on cold surfaces, which happens when the property is inadequately heated, when ventilation is insufficient to remove moisture generated by cooking and washing, or when the building fabric provides cold bridges that create localised cold spots on the internal surfaces.

Structural damp, by contrast, arises from water penetrating the building fabric from outside, from rising damp through the ground floor structure, or from plumbing defects such as leaking pipes or overflowing gutters. In London properties, all three types of structural damp are common: the age of the building stock means that damp-proof courses are often defective or absent, external rendering is frequently cracked or eroded, and gutters and downpipes are often in poor condition. The distinction between condensation and structural damp is not always obvious from a visual inspection, and a proper investigation may require a qualified surveyor or engineer to identify the moisture source.

Plumbing Causes of Damp in London Rental Properties and How to Address Them

A significant proportion of damp complaints in London rental properties arise from plumbing defects rather than from building fabric failure or condensation. A slow leak from a compression fitting under a kitchen or bathroom floor can saturate the sub-floor and migrate to adjacent walls before becoming visible as damp staining or mould growth. A leaking soil pipe joint in a concealed location can produce persistent dampness that is difficult to trace without specialist leak detection equipment. An overflowing or blocked gutter, which is a common occurrence in London properties with mature trees nearby, can allow water to saturate external masonry and penetrate through to the internal surfaces.

Prestige Engineers carry out damp investigation and plumbing leak detection in London rental properties, using moisture meters, thermal imaging cameras, and acoustic detection equipment to identify the source of moisture where it is not immediately apparent from a visual inspection. Where the source of damp is a plumbing defect, we carry out the necessary repair works and provide a written report documenting the cause of the damp, the works carried out, and the expected outcome. This documentation is important for London landlords who need to demonstrate compliance with the Awaab Law investigation and reporting requirements and to defend any subsequent claim by the tenant that the landlord failed to investigate and address the hazard within the required timeframes.