Mould in rented properties is a common issue in the UK. When it appears, many tenants ask the same question: is the landlord responsible?

In most cases, landlords are legally responsible for addressing mould if it is caused by structural issues, poor insulation, leaks, or inadequate ventilation.

Is a Landlord Legally Responsible for Mould?

Under UK law, landlords must ensure a property is:

• Structurally sound
• Free from serious damp hazards
• Safe to live in
• Properly maintained

If mould is caused by:

• Leaking roofs
• Faulty plumbing
• Broken extractor fans
• Poor insulation
• Rising damp
• Structural damp issues

The landlord is usually responsible for fixing it.

When Might a Tenant Be Responsible?

Tenants may be partly responsible if mould is caused by lifestyle factors such as:

• Not ventilating rooms
• Drying clothes indoors without airflow
• Blocking vents
• Failing to report leaks

However, landlords cannot avoid responsibility if the property itself contributes to condensation through poor insulation or ventilation design.

What Does the Law Say?

The Homes (Fitness for Human Habitation) Act 2018 requires landlords to ensure rental properties are free from serious hazards, including damp and mould growth.

Local councils can intervene if a property is deemed unsafe due to damp or mould issues.

What Should Tenants Do?

If mould appears:

1. Inform the landlord in writing
2. Take photographs
3. Keep records of communication
4. Allow access for inspections
5. Contact the local council if the issue is ignored

Written communication is important for evidence.

What Should Landlords Do?

Landlords should:

• Investigate the source of moisture
• Repair leaks promptly
• Improve ventilation where necessary
• Ensure insulation meets standards
• Provide functioning extractor fans

Simply advising tenants to “open windows” is not always sufficient if structural issues exist.

Can Tenants Withhold Rent?

Tenants should not withhold rent without legal advice. Doing so can lead to eviction proceedings.

If the landlord fails to act, tenants should contact their local authority or seek legal guidance.

Final Thoughts

In the UK, landlords are generally responsible for mould caused by structural defects, damp, or inadequate ventilation. Tenants may share responsibility if lifestyle factors contribute, but properties must meet basic living standards.

If mould is persistent, identifying the underlying cause is essential.