HHSRS Hazard 1 - Damp & Mould Growth

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If a tenant reports a property to the Council for a HHSRS Hazard 1 - Damp & Mould Growth issue, the Council is legally obligated to inspect the property for all 29 hazards outlined in the Housing Health & Safety Rating System (HHSRS).

If the Council uncovers any Category 1 risks, it is obliged by law to take action against the landlord and any associated agents. This is not just a formality; it is a serious obligation that must be addressed.

Hazard 1 - Damp & Mould Growth

This hazard covers threats to health associated with increased prevalence of house dust mites and mould or fungal growths resulting from dampness and/or high humilities. It includes threats to mental health and social well being which may be caused by living with the presence of damp, damp staining and/or mould growth.

The indications are that house dust mite populations and indoor mould growth have increased over the last century. This is probably because of reduced ventilation levels, increased humidities, and warmer indoor temperatures in winter months caused by changes in dwelling design and adaptations introduced when houses are renovated.

Vulnerable Group: Children 0 - 14 years

Defects & Justifications

Energy efficiency - inadequate heating and insulation of the dwelling.
Background ventilation - lack of controllable background ventilation.
Extract ventilation - lack of safe and accessible means for the extraction of moisture laden air during cooking, bathing or showering.
Clothes drying facilities - lack of facilities ventilated to the external air.
Damp proofing - in disrepair or otherwise inadequate, resulting in rising or penetrating dampness.
Disrepair - floors, walls or roofs allowing water penetration.
Exposed water tanks and pipework - inadequate frost protection.
Water using appliances - inadequately installed and sealed facilities, such as baths, showers, wash hand basins and wc basins which may permit splashing.
Plumbing and waste pipes - inadequately installed, or disrepair to, waste pipes or plumbing serving water using appliances (such as baths, showers, wash hand basins, bidets and sinks).
Rain water goods - inadequate or defective.
Roof and sub-floor spaces - inadequate ventilation.
Small rooms sizes - may result in high occupant density.

Index of HHSRS Hazards

Rectifying the HHSRS Hazard 1 - Damp & Mould Growth: Guidance Checklist

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How can I identify the cause of damp and mould in a property?

Start by checking for common sources such as leaking roofs, rising damp, broken guttering, or poor ventilation. Use a moisture meter to identify damp patches in walls and floors. Condensation build-up on windows and black mould in corners are key visual clues.

What are the most effective ways to reduce condensation?

Improve airflow by installing trickle vents and extractor fans in kitchens and bathrooms. Encourage tenants to keep lids on pans, dry clothes outdoors if possible, and use mechanical ventilation. Consider adding Positive Input Ventilation (PIV) systems in more severe cases.

How do I repair structural causes of damp?

Fix leaking roofs, cracked render, or failed damp-proof courses. Replace damaged pointing or flashing and clear blocked drains and gutters. Rising damp often requires installing or repairing a damp-proof course or membrane.

Should I use anti-mould treatments?

Yes, once the root cause of damp is fixed, treat affected areas with anti-fungal wash and repaint using anti-mould paint. Ensure the area is thoroughly dried before redecorating. For persistent problems, professional treatment may be required.

What longer-term solutions can prevent damp and mould?

Invest in insulation upgrades (e.g. cavity wall or solid wall insulation), ensure all rooms are adequately heated, and maintain good ventilation throughout the year. Regular property inspections help spot issues early before they worsen.