Landlord blaming tenant for mould

Short answer

No, a landlord cannot automatically escape responsibility for mould simply by labelling it “condensation” caused by your “lifestyle” as students. Whether that argument works depends on the underlying cause. If the mould is genuinely and mainly caused by how the property is used (never opening windows, drying washing indoors with no ventilation, never heating the rooms), the landlord may have a defence. But if the mould is mainly caused by a defect that is the landlord’s responsibility, such as inadequate insulation, defective or absent extractor fans, poor ventilation design, penetrating or rising damp, leaks, or cold bridging, then blaming your lifestyle will not defeat a claim. The label “condensation” is often used as a shield, but the law looks at the real cause.

The legal framework

The main duty is in section 9A of the Landlord and Tenant Act 1985, inserted by the Homes (Fitness for Human Habitation) Act 2018. This implies a term into most residential tenancies that the property must be fit for human habitation at the start of the tenancy and throughout it. Damp and mould are expressly recognised as matters that can make a home unfit. If the property is unfit, the tenant can sue the landlord to force repairs and claim compensation, without having to wait for the local council to act.

There is also the older repairing obligation under section 11 of the Landlord and Tenant Act 1985, which requires the landlord to keep the structure and exterior in repair and to keep installations for heating, water and sanitation working. Section 11 is narrower because it generally requires some disrepair (physical damage to the structure or installations) rather than a mere design defect, so mould from pure condensation with no underlying disrepair can sometimes fall outside section 11. Section 9A is broader and is often the stronger route for condensation-related mould.

The key point on the “lifestyle” defence

Recent guidance on section 9A makes the position clear. Condensation mould that is wholly or mainly the result of the tenant’s own failure to ventilate or heat the property can defeat a fitness claim. But the same mould, if mainly attributable to a defect that is the landlord’s responsibility, such as inadequate insulation or the absence of effective ventilation, will not defeat the claim, even where the tenant’s use of the property has played some part in it.

Importantly, the threshold for the landlord’s “tenant’s fault” defence is a high one. Tenant behaviour that is only a real but secondary cause of the mould is not enough. The landlord has to show that the unfitness is wholly or mainly attributable to how you used the home. So a landlord cannot simply assert “students cause condensation” and leave it there. They would have to prove that your conduct, rather than any defect in the building, is the dominant cause.

What actually causes the mould matters

The dispute usually turns on facts, so it helps to think about which explanation fits your situation.

Signs pointing to a landlord-responsibility problem include mould that appears even where rooms are heated and ventilated, mould behind furniture on cold external walls (cold bridging and poor insulation), extractor fans that are missing, broken or ineffective in the kitchen and bathroom, windows that will not open or have no trickle vents, damp that comes up from the floor (rising damp) or in from the outside (penetrating damp), staining around leaking pipes, gutters or roofs, and mould that was present or recurring before your tenancy or across successive tenants.

Signs that might support the landlord’s argument include mould confined to areas where moisture is generated, combined with clear evidence that windows are never opened, trickle vents are taped over, washing is routinely dried on radiators without ventilation, extractor fans are switched off, and the heating is rarely used. Even then, if the property has no adequate means of ventilation or heating in the first place, the “lifestyle” argument tends to collapse, because the tenant cannot be blamed for failing to use ventilation or heating that the property does not adequately provide.

A landlord can legitimately point to ordinary, non-culpable explanations, and not every damp problem is the landlord’s legal responsibility. That is why identifying the dominant cause is central.

Awaab’s Law and the direction of travel

Following the death of Awaab Ishak, government policy has moved firmly against landlords dismissing damp and mould as a tenant “lifestyle” issue. Awaab’s Law introduces strict legal timescales for social landlords in England to investigate and fix damp and mould hazards, and the Renters’ Rights framework is extending decent-homes and hazard standards, with plans to apply Awaab’s Law principles to the private rented sector in stages. The exact commencement dates and the precise scope for private landlords are being phased in, so the detailed timescales that bind a private student landlord may not yet be in force. The clear regulatory message, however, is that reflexively blaming the occupier is not an acceptable substitute for investigating and remedying the cause.

If your landlord is a university, a purpose-built student accommodation provider, or a housing association, additional codes may apply (for example the ANUK/Unipol codes for student housing and the Housing Ombudsman scheme for social landlords), which reinforce the duty to investigate rather than blame.

Evidence to gather now

Because the outcome depends heavily on cause, build a clear record.

1. Photograph and date all affected areas, including behind furniture and around windows, and repeat over time to show recurrence.

2. Note where the mould is, whether it returns after cleaning, and whether it appears in rooms you do heat and ventilate.

3. Check and record whether there are working extractor fans in the kitchen and bathroom, whether windows open, and whether there are trickle vents.

4. Keep a simple log of how you use the property (heating on, windows opened, use of fans, where you dry washing) to counter a lifestyle allegation.

5. Keep all correspondence with the landlord or agent in writing, and report the problem clearly and promptly, describing symptoms and asking them to investigate the cause.

6. If you can, obtain an independent damp and mould survey or a surveyor’s report identifying the cause, as this is often decisive. Photographs of damp meter readings or thermal imaging can help distinguish condensation from penetrating or rising damp.

7. Keep any evidence of health effects, GP letters, or damaged belongings.

Practical steps in a sensible order

Start by reporting the problem in writing and asking the landlord to inspect and identify the cause, rather than accepting a blanket “it’s condensation from your lifestyle” response. Ask them specifically what ventilation and heating the property provides and whether the extractor fans and insulation are adequate. A reasonable landlord should investigate.

If they refuse to act, you can ask your local council’s environmental health team to inspect under the Housing Health and Safety Rating System. Damp and mould is a recognised hazard, and if the council finds a serious (category 1) hazard it can require the landlord to carry out works. This route is free and can be very effective. Be aware that in an assured shorthold tenancy there are limited protections against a retaliatory eviction, and complaining to the council can, in defined circumstances, trigger protection against a section 21 notice, so keep the paper trail.

Informal resolution and, where relevant, a formal written complaint through any accreditation scheme, letting agent complaints process, or (for social/PBSA landlords) the relevant ombudsman should generally come before court.

As a last resort, you can bring a claim under section 9A and/or section 11 for an order requiring repairs and for compensation for the reduced value of living in a mouldy home and for damaged possessions. Litigation carries cost, delay and evidential risk, so it is usually worth exhausting the council and complaint routes first, and getting an independent survey to prove cause.

How the facts could change the answer

If an independent inspection shows missing or broken extractor fans, no trickle vents, single glazing with cold walls, or any leak or structural damp, the “student lifestyle” defence is very unlikely to succeed and the landlord will generally be responsible. If, by contrast, the property has adequate heating and ventilation that you have simply not used, and the mould is confined to areas of moisture generation, the landlord’s argument becomes much stronger, though they would still need to show your conduct is the main cause. In practice most student condensation cases involve a mixture, and the law comes down in the tenant’s favour unless the landlord can show that tenant behaviour is the dominant cause rather than merely a contributing factor.

Bottom line

The landlord cannot lawfully dodge responsibility just by attaching the word “condensation” to the problem and blaming students. The decisive question is the main cause. Ask them to investigate and fix the cause, gather evidence (ideally an independent survey), use the council’s environmental health powers if they stall, and keep court as a backstop.