Hidden mould behind furniture: what tenants need to know

Mould is not always visible at first. It can grow behind wardrobes, under carpets, inside cupboards, and behind large pieces of furniture placed against cold walls. By the time you find it, it may have been present for months. Below, we explain what hidden mould means for tenants and how to handle it.

Key facts

• The 2024 to 2025 English Housing Survey found about 5% of homes in England, around 1.4 million, had a problem with damp, most common in privately rented homes (10%). English Housing Survey 2024-25, GOV.UK
• Official guidance from the UK Health Security Agency and the Department of Health and Social Care links damp and mould in homes in England to around 5,000 cases of asthma and 8,500 lower respiratory infections among children and adults. Health risks of damp and mould, GOV.UK

Why does mould grow behind furniture?

When a cold surface (such as an exterior wall) is covered by furniture that blocks airflow, moisture in the air can condense on that surface and mould will grow in the damp, poorly ventilated space behind. This is particularly common:

• In older properties with solid walls (which conduct cold more than insulated or cavity walls)
• In rooms with poor heating or ventilation
• Where furniture is pushed directly against exterior walls

The presence of mould behind furniture is often blamed on the tenant's behaviour, the way they heat or ventilate the property. However, if the underlying cause is a cold, poorly insulated structure, the landlord may be responsible.

How do I know if the mould is caused by the property or my behaviour?

This can be difficult to assess without a survey, but some indicators that the cause is structural include:

• Mould growing in consistent patterns along cold walls, regardless of ventilation
• Mould appearing in multiple rooms without obvious causes
• Mould growing on structural surfaces (walls, ceilings) rather than just condensation-prone surfaces (windows, tiles)
• The property being cold even when the heating is running, suggesting poor insulation

A surveyor can assess the cause and produce a report on what is responsible.

What should I do if I find hidden mould?

1. Photograph it immediately: note the date and the location. This establishes when you discovered it and its extent.
2. Report it to your landlord in writing: send an email or letter describing what you have found. Keep a copy.
3. Move the furniture away from the wall temporarily to allow the surface to dry, and clean any mould with appropriate products (diluted bleach or proprietary mould cleaner).
4. Ventilate the room: open windows when possible, especially in kitchens and bathrooms.
5. Monitor whether it returns: if the mould comes back despite your efforts to ventilate, this suggests the problem is structural.

Can the landlord blame me for mould behind my furniture?

They may try. Landlords often argue that mould is caused by condensation from the tenant's lifestyle. However, this argument has limits. If the property is cold, poorly insulated, or has structural damp problems, the landlord cannot simply blame the tenant. An independent survey will usually clarify the cause.

If a landlord disputes that the mould is their responsibility, you can escalate to environmental health or consider a housing disrepair claim.

Can I claim compensation for mould that was hidden when I moved in?

If mould was hidden behind furniture when you moved in, you may not have known about it, but your landlord may have. Even if the landlord did not know, their responsibility under the Homes (Fitness for Human Habitation) Act 2018 and section 11 of the Landlord and Tenant Act 1985 begins from the moment the problem could reasonably have been identified and reported.

If the problem was reported and not fixed, or if it should have been identified during a proper inspection, a claim may be possible.

When should I contact Support for Tenants?

If you have discovered mould, hidden or visible, that your landlord has not fixed, call us.

Call us on 0800 030 4669. No upfront cost. You only pay if you win, and the fee comes out of the compensation, not your pocket. If you don't win, you pay nothing.

Sources

• Landlord and Tenant Act 1985, Section 11 (legislation.gov.uk)
• Homes (Fitness for Human Habitation) Act 2018 (legislation.gov.uk)
• Understanding and addressing the health risks of damp and mould in the home (GOV.UK)

Related articles

• Condensation versus damp, what is the difference?