Handling mould complaints professionally

Why it matters

Failing to address mould complaints effectively can lead to severe health risks for tenants, potential legal action under the Homes (Fitness for Human Habitation) Act 2018, and reputational damage. Local authorities can issue improvement notices or even prosecute, while courts may order compensation payments. Early intervention is often less costly and disruptive than resolving long-standing issues or legal disputes.

Legal requirements

• Landlords must ensure their rented properties are fit for human habitation at the start and throughout the tenancy, as stipulated by the Homes (Fitness for Human Habitation) Act 2018.
• The property must be free from hazards, including excess damp and mould, as categorised under the Housing Health and Safety Rating System HHSRS.
• Landlords are generally responsible for repairs to the structure and exterior of the property, including preventing water ingress that could lead to mould, under the Landlord and Tenant Act 1985.
• Where mould results from a structural defect or poor insulation, the landlord typically holds the primary responsibility for remedial works.
• Landlords must cooperate with local authority investigations into housing conditions, providing access and information as requested.
• In HMOs, specific management regulations may impose additional duties regarding property maintenance and health and safety.
• Landlords must provide adequate ventilation and heating systems to help prevent condensation, although tenants also have a role in their use.
• Any repairs or remedial works must be carried out by suitably qualified professionals and completed within a reasonable timeframe.
• Under the Renters' Rights Act 2025, tenants have enhanced rights regarding property standards and the ability to report issues without fear of retaliatory eviction.
• If a property becomes uninhabitable due to mould, the landlord may be liable for rehousing costs or rent refunds.

Common mistakes

• Dismissing tenant complaints about mould as solely due to 'lifestyle' without proper investigation.
• Delaying a site visit or professional inspection after receiving a mould complaint.
• Applying superficial remedies, such as simply painting over mould, without addressing the underlying cause.
• Failing to communicate clearly and empathetically with the tenant throughout the process.
• Not documenting every stage of the complaint, investigation, and remediation process.
• Ignoring the potential health implications of mould exposure for vulnerable tenants.
• Failing to engage qualified professionals for complex mould issues or structural repairs.
• Attributing all mould issues to tenant behaviour without first ruling out structural or maintenance defects.

Practical guidance

• Acknowledge the tenant's complaint promptly and confirm receipt, ideally within 24-48 hours.
• Schedule a visit to the property as soon as possible, with the tenant's agreement, to assess the mould yourself.
• Attempt to identify the source of the mould during your visit; differentiate between condensation and penetrating/rising damp.
• If the cause is unclear or complex, arrange for a qualified damp and mould specialist to conduct a professional survey.
• Communicate findings to the tenant clearly and explain the proposed remediation plan and timeline.
• Implement immediate temporary measures if necessary to protect tenant health or prevent further spread.
• Arrange for professional mould remediation, ensuring the underlying cause is addressed, not just the visible mould.
• Provide tenants with advice on ventilation and heating to help prevent future condensation-related mould, if appropriate.
• Follow up with the tenant after remediation to ensure the problem has been resolved and no recurrence is evident.
• Keep detailed records of all communication, inspections, reports, and works completed.

Initial Response and Assessment

Upon receiving a mould complaint, your immediate response sets the tone. Acknowledge the tenant's report promptly, ideally within one working day. Schedule a property visit at the earliest convenience, always with the tenant's consent and appropriate notice. During this visit, conduct an initial assessment. Look for visible mould growth, check for signs of dampness, water leaks, or poor ventilation. Take photographs and make detailed notes. Engage in open communication with your tenant, asking about their observations, ventilation habits, and heating patterns. It is essential to differentiate between condensation damp, which often appears as surface mould in corners, behind furniture, or on windowsills, and penetrating or rising damp, which usually indicates a structural issue. Do not jump to conclusions about tenant behaviour; a thorough investigation is paramount. Should the cause not be immediately apparent, or if the issue seems significant, consider instructing a professional damp and mould surveyor.

Identifying the Cause: Landlord vs. Tenant Responsibility

Accurately identifying the cause of mould is critical for assigning responsibility and ensuring effective remediation. Landlords are generally responsible for structural repairs, issues arising from disrepair in the exterior of the property, faulty plumbing, or inadequate insulation, all of which can lead to penetrating or rising damp. Refer to our article 'Landlord repairing obligations: what you must fix' for more detail. If the mould is due to a structural defect or a failure in the property's services that the landlord is responsible for, then the landlord must remediate. If the mould is primarily due to condensation, which is often exacerbated by tenant lifestyle choices such as inadequate ventilation, drying clothes indoors without ventilation, or insufficient heating, the situation becomes more nuanced. Even in these cases, landlords have a duty to ensure the property has adequate ventilation and heating systems. The Homes (Fitness for Human Habitation) Act 2018 means landlords must provide a property that is fit for human habitation, making it less likely that all responsibility can be shifted solely to the tenant, even for condensation issues, if the property itself contributes to the problem.

Remediation and Prevention Strategies

Once the cause is identified, a clear remediation plan must be put in place. For structural issues, engage qualified contractors to carry out repairs to roofs, walls, plumbing, or damp-proofing. For surface mould, professional cleaning and treatment are necessary; merely painting over mould will not resolve the underlying issue. Ensure the affected area is thoroughly dried and treated with fungicidal wash before redecoration. For condensation related mould, consider installing extractor fans in kitchens and bathrooms or upgrading insulation. Provide tenants with clear, actionable advice on how to minimise condensation through proper ventilation, heating, and managing moisture-producing activities. This might include using extractor fans, opening windows, keeping heating on low consistently, and avoiding drying clothes on radiators. Document all advice provided and any improvements made to the property. Regular property inspections can also help identify potential issues early on, as discussed in 'Damp and mould: landlord responsibilities explained'.

Communication and Documentation

Maintaining excellent communication with your tenant throughout the mould remediation process is paramount. Keep them informed of each step, including survey dates, repair schedules, and expected completion times. Be empathetic and address any concerns they may have about their health or the property's condition. Document everything meticulously: the initial complaint, your response, site visit notes, photographs, surveyor reports, contractor quotes, invoices for work done, and all correspondence with the tenant. This comprehensive record is invaluable for demonstrating your compliance with legal obligations and can be crucial evidence if a dispute arises or if the local authority becomes involved. Ensure all communications are in writing or confirmed in writing. A transparent and well-documented approach protects both you and your tenant.

Legal Framework and Regional Variations (UK)

Across the UK, the core principle is that landlords must provide safe and habitable homes. In England, the Homes (Fitness for Human Habitation) Act 2018 is central, along with the Housing Health and Safety Rating System HHSRS. The Renters' Rights Act 2025 further strengthens tenant protections. In Scotland, the Housing (Scotland) Act 2006 establishes the Repairing Standard, which requires properties to be wind and watertight, with satisfactory provision for ventilation and free from damp and condensation. The Scottish Housing Quality Standard also sets out minimum requirements. In Wales, the Renting Homes (Wales) Act 2016 (fully implemented December 2022) places a duty on landlords to ensure the dwelling is fit for human habitation, including being free from damp and mould. Northern Ireland's legislation includes the Private Tenancies (Northern Ireland) Order 2006, which implies a term of fitness for human habitation. While the specific statutory instruments vary, the underlying obligation to address damp and mould remains consistent across all UK regions. Local authorities in all regions have powers to intervene where properties are found to be substandard.