Condensation Mould – Who is Responsible?

What is Condensation Mould? 

Condensation mould is a common issue in rental properties, often appearing as black mould on internal walls. It can range from small patches to covering an entire wall, and it’s frequently noted during property visits or raised by tenants as a maintenance concern.

There is often confusion between landlords and tenants regarding who is responsible for addressing condensation mould. Tenants often assume it’s the landlord’s responsibility, but this is not always the case.

How Does Condensation Mould Form? 

Condensation mould develops when warm air comes into contact with a cold surface, typically an external wall or window, causing moisture in the air to condense into water droplets. An average household of four can release around 14 litres of water into the air daily through activities like showering, cooking, and even breathing. During sleep, a person can release up to 1 litre of moisture in 8 hours!

Who is Responsible for Tackling Condensation Mould?

The Landlord's Responsibilities: 

Landlords must ensure that the property is in good condition to prevent condensation mould from forming. This includes:

Fixing maintenance issues, such as leaks, in a timely manner.

Providing an adequate heating system.

Ensuring proper ventilation through extractor fans, windows, or trickle vents.

Ensuring the property is properly insulated to avoid “cold spots.”

The Tenant's Responsibilities: 

Tenants are responsible for taking reasonable steps to minimise condensation and prevent mould growth, including:

Adequately heating the property, especially during colder months, mornings, and nights.

Ventilating the home by opening windows, using trickle vents, and operating extractor fans in kitchens and bathrooms.

Avoiding drying clothes on radiators or indoor airers, as this adds moisture to the air.

Leaving small gaps between furniture and walls to promote airflow.

Dealing with Mould 

If condensation mould does form, tenants are generally expected to wipe down and clean the affected surfaces regularly to prevent damage to furnishings, window frames, walls, and ceilings.