How to prevent mould in rented properties (for tenants and landlords)

Mould is one of the most common complaints in rented homes across the UK. It not only looks unpleasant, but it can also cause health issues and ongoing disputes between tenants and landlords. Whether you’re renting a flat or managing multiple properties, knowing how to handle mould in rented property is crucial for protecting health, preventing damage, and staying on the right side of the law.

In this guide, we’ll break down the causes of mould in rental properties, who’s responsible for dealing with it, and what both tenants and landlords can do to prevent it long-term.

What causes mould in rented homes?
The majority of mould problems in rental properties are caused by excess moisture, usually from condensation, damp, or poor ventilation. Everyday activities like cooking, drying clothes indoors, or showering without an extractor fan can increase humidity levels, especially in smaller or older homes with limited airflow.

Sometimes, though, mould points to deeper structural issues like rising damp, water ingress from leaking roofs or windows, or insufficient insulation. That’s why it’s so important to identify the root cause before treating the problem.

Is mould dangerous?
Yes, especially black mould. The NHS warns that exposure to mould spores can lead to respiratory issues, allergies, and worsening symptoms in people with asthma or weakened immune systems. It’s particularly harmful for babies, young children, and the elderly. Even in mild cases, mould can trigger sneezing, coughing, and eye irritation. That’s why quick action is essential, not just to protect the property, but to safeguard health too.

Who’s responsible for mould in a rental property?
In the UK, responsibility for mould in rented accommodation is shared - but it depends on the cause.

Landlord responsibilities:
Landlords are responsible for:

• Ensuring the property is fit to live in, including being free from damp and mould caused by structural issues.
• Addressing any issues with leaking pipes, windows, roofs or rising damp.
• Installing and maintaining ventilation systems, like extractor fans in kitchens and bathrooms.
• Providing adequate heating and insulation.

If mould is caused by a repair issue or poor property condition, it’s the landlord’s legal duty to fix it under the Homes (Fitness for Human Habitation) Act 2018 and Section 11 of the Landlord and Tenant Act 1985.

Tenant responsibilities:
Tenants are expected to:

• Report mould problems early to the landlord or letting agent.
• Maintain reasonable cleanliness and use heating and ventilation systems properly.
• Avoid creating excess moisture (e.g., drying clothes indoors without ventilation).
• Regularly open windows to let air flow.

If mould results from lifestyle habits and there’s no structural issue, the tenant may be responsible for managing it.

Tips to prevent mould – For tenants

• Always use extractor fans when cooking or showering.
• Open windows regularly to improve airflow, even in winter.
• Keep furniture slightly away from external walls to allow air circulation.
• Wipe down windows and sills if condensation builds up.
• Dry clothes outside or in a well-ventilated room when possible.
• Let your landlord know immediately if you spot signs of damp or leaks.

Tips to prevent mould – For landlords

• Ensure the property is well-insulated and draught-proofed.
• Install good-quality ventilation, especially in kitchens and bathrooms.
• Use mould-resistant paint in high-risk areas.
• Check for leaks, broken seals or damp patches during inspections.
• Consider installing a positive input ventilation (PIV) system in problem homes.
• Educate tenants with a welcome pack that includes moisture control advice.

Being proactive can prevent costly repairs and disputes down the line, and help you stay compliant with rental regulations.

What to do if mould keeps coming back
If you’ve cleaned the mould but it keeps returning, it’s likely due to a deeper issue that needs professional attention. Simply painting over mould or wiping it away won’t fix it long-term. Persistent mould often points to hidden leaks, poor insulation, or inadequate airflow.

At Dwelling Doctors, we offer mould inspections and treatment plans specifically for rented properties. Whether you’re a landlord needing peace of mind or a tenant seeking support, we’ll help identify the source, treat the issue safely, and prevent it from coming back.

Article Author

Scott Evans

Scott Evans is the founder and CEO of Dwelling Doctors