Damp, Mould and Condensation: Landlord Responsibilities

If a tenant reports damp or mould, you now have strict legal duties and time limits, and "it is just condensation" will not save you if the property itself is prone to damp.

"This guide provides general information about UK landlord tax obligations. It is not financial or legal advice. Tax treatment depends on your individual circumstances and may change. Consider consulting a qualified accountant or solicitor for advice specific to your situation."

1. Law: why damp and mould are now a big legal risk

Key legislation

• Landlord and Tenant Act 1985 s11: you must keep the structure and exterior in repair and keep heating, hot water, water and sanitation in proper working order.
• Housing Act 2004 Part 1 -- HHSRS: councils use the Housing Health and Safety Rating System to rate hazards. Serious damp and mould can be a Category 1 hazard, which triggers a duty to act.
• Homes (Fitness for Human Habitation) Act 2018 -- s9A LTA 1985: every qualifying tenancy has an implied term that the home must be fit for human habitation, including no serious damp or mould.

If your property has serious damp/mould:

• The tenant can sue you directly for breach of fitness, for repairs and damages.
• The council can serve improvement notices, emergency remedial action or civil penalties if they rate it as a Category 1 hazard.

2. Types of damp and who pays

You need to distinguish the cause:

Rising damp

• Moisture rising from the ground due to missing / failed damp proof course or defective floors.
• Almost always your responsibility: it affects the structure and exterior, and will usually be disrepair under s11 and a hazard under HHSRS.

Penetrating damp

• Water getting in from outside: leaking gutters, downpipes, roof defects, cracked render, failed pointing, defective seals around windows/doors.
• Again, your responsibility: it is structural or exterior disrepair and a HHSRS hazard if it affects health.

Condensation damp / mould

• Moisture from everyday living (cooking, bathing, drying clothes) condensing on cold surfaces, often leading to mould growth.
• The historic landlord line is "lifestyle", but the current legal position is harder on you:
• You are responsible for ensuring the property is not inherently prone to condensation.
• That means adequate heating, ventilation and insulation.
• Shelter and government guidance are now explicit:
• If damp/mould is caused or worsened by poor insulation, lack of or inadequate ventilation, or inadequate heating provision, it is your problem even if tenant behaviour contributes.
• You carry the burden of proof that the property is not inherently prone to condensation.

3. Awaab's Law and the new PRS timelines

Awaab's Law started with social housing after the death of Awaab Ishak, then got extended in principle to the PRS through the Renters' Rights Act 2025.

For social landlords (from 27 October 2025)

• Must investigate significant damp and mould hazards within about 10 working days of a complaint.
• Must make safe remedial works within 5 working days of inspection for serious damp/mould hazards.
• Emergency hazards must be made safe within 24 hours of being reported.
• Must confirm findings and actions to the tenant in writing within 3 working days of inspection.

Expected position for PRS in 2026 (based on government and legal commentary)

• You must acknowledge and investigate damp/mould reports within about 14 days.
• Where there is a serious hazard, you must start repairs within 7 days of investigation, and deal with emergency hazards within 24 hours.
• You must document what you did: inspection, photos, contractor instructions, and give the tenant written updates.

If you ignore these standards and there is serious harm, you are on the hook under:

• Fitness for habitation (s9A).
• HHSRS enforcement.
• Potential negligence / personal injury claims if the mould harms health.

4. Enforcement, Category 1 hazards and tenant claims

When is mould a Category 1 hazard?

Government guidance: damp and mould are one of 29 HHSRS hazards. If assessed at the most dangerous level, they are Category 1.

In practice, this is usually:

• Widespread mould in bedrooms or main living areas.
• Vulnerable occupants (children, elderly, respiratory issues).
• Longstanding problems where previous "treatments" were just re-painting.

If the council finds a Category 1 hazard, it has a duty to take enforcement action

• Improvement notice (most common): sets out works and compliance dates.
• Hazard awareness notice (for lower-end cases).
• Emergency remedial action or emergency prohibition order where there is an imminent risk of serious harm.
• Since 2016, they can issue civil penalties up to GBP 30,000 instead of prosecution for certain offences.

Tenant claims

Under s9A fitness, the tenant can sue you directly for:

• An order for specific performance (do the works).
• Damages for distress, inconvenience, loss of amenity, and sometimes for property damage.
• If they can link health issues (asthma, respiratory problems) to your failure to deal with mould, they may pursue a separate personal injury claim, often using HHSRS Category 1 status and medical evidence as support.

Typical landlord costs to fix

• Investigative survey: GBP 200-600 (damp specialist).
• Basic repairs (improved extraction fans, trickle vents, minor plaster repairs, anti-mould treatment): GBP 500-2,000 for a standard 2-bed.
• More serious cases (DPC injection, floor replacement, external pointing/render, re-roofing sections): GBP 3,000-15,000+ depending on property and location.

Those numbers are still cheaper than a serious claim plus legal costs.

5. "Lifestyle condensation" and what forums get wrong

The old landlord script was "open your windows more and stop drying clothes indoors". That will not wash any more.

Current legal and guidance line

It is your responsibility to provide:

• Adequate fixed heating that can reasonably heat the property.
• Effective ventilation in kitchens and bathrooms (mechanical extract that actually works and is used).
• Decent insulation and draught-proofing, so surfaces are not freezing cold.

You can give sensible advice on using heating/ventilation, but you cannot refuse to act on serious mould because "they dry clothes on radiators".

Forums are often wrong on

"If it is condensation, it is always the tenant's fault." Wrong. If the property is cold and under-ventilated because of your design and equipment, you are responsible. You must show the property is not inherently prone to condensation.

"Just repaint with anti-mould and it is sorted." Councils and courts see through this. Painting over without tackling the cause is not compliance and can still leave you with a fitness breach or HHSRS hazard.

"Awaab's Law is only for councils and housing associations." It started there, but the government has already committed to extend Awaab's Law principles to the PRS through the Renters' Rights Act and Decent Homes reforms.

"If the tenant never reports it, I am safe." Fitness and HHSRS duties do not vanish because nobody emails you. If a hazard exists and you should have known (for example via mid-term inspections), you can still be on the hook.

Practical approach that keeps you out of trouble

• Do regular inspections with photos in winter.
• When anything is reported:
• Acknowledge in writing.
• Inspect within 14 days.
• If serious, get works started within 7 days of inspection, and deal with any genuine emergency in 24 hours.
• Keep a paper trail: contractor quotes, invoices, before/after photos.

Legislation tracker, budget coverage, new tools. Free, no spam.

Didn't find what you were looking for?