Damp and Mould: Complete 2026 Landlord Guide (Awaab's Law)

Damp and mould in rental properties is a serious health hazard and one of the most common causes of landlord–tenant disputes in the UK. Since the introduction of Awaab’s Law — extended to private rentals under the Renters’ Rights Act from May 2026 — landlords face statutory investigation and repair deadlines for the first time. Blaming “tenant lifestyle” is no longer a viable defence if the building fabric is contributing to the problem. Get it wrong and you face rent repayment orders, county court claims, and local authority fines reaching £30,000.

This guide covers the types of damp, your legal duties under each piece of relevant legislation, the Awaab’s Law timelines, how to investigate and fix each damp type correctly, and how to document everything to protect yourself if a dispute arises.

Your Legal Framework for Damp and Mould

Three overlapping pieces of legislation impose duties on you:

Section 11 of the Landlord and Tenant Act 1985 requires you to keep in repair the structure and exterior of the dwelling and all installations for water supply, heating, and sanitation. Penetrating damp caused by a failing roof, blocked gutter, or cracked render is a Section 11 breach. You cannot contract out of this obligation — any tenancy agreement clause purporting to transfer these duties to the tenant is void.

The Homes (Fitness for Human Habitation) Act 2018 amended the Landlord and Tenant Act 1985 to add a duty that the property is fit for human habitation at the start and throughout the tenancy. Fitness is assessed under the Housing Health and Safety Rating System (HHSRS). Damp and mould growth is one of the 29 HHSRS hazard categories. A property rated as posing a Category 1 HHSRS hazard from damp is not fit for habitation. Tenants have a direct private right of action in the county court under the 2018 Act — they do not need to go through the local authority first.

Awaab’s Law — introduced for social housing by the Social Housing (Regulation) Act 2023 and extended to private rentals under the Renters’ Rights Act from May 2026 — imposes fixed response deadlines when an HHSRS hazard is reported. For the first time, private landlords face mandatory investigation and repair timescales enforceable through the courts.

See our landlord maintenance responsibilities guide for the full repair framework including Section 11 duties, access rights, and how courts assess reasonable repair timeframes.

Awaab’s Law: What Private Landlords Must Do and When

From May 2026, when a tenant reports a condition that amounts to a HHSRS hazard — which includes significant damp and mould — you must:

Step	Deadline
Investigate the reported hazard	Within 14 days of the tenant’s report
Begin emergency repairs (immediate risk to life)	Within 24 hours of the report
Complete non-emergency hazard remediation	Within a reasonable period following investigation — enforcement guidance expects 7 days for urgent hazards

These deadlines run from the date you receive the report. The practical implication is straightforward: when a tenant sends you a text, email, or written notice about damp or mould, the clock starts. Acknowledge it in writing with the date, arrange a visit within the 14-day window, and document every step.

Failure to meet these timescales gives the tenant grounds to apply to the First-tier Tribunal (Property Chamber) for a rent repayment order and to bring a civil claim for damages. Local authorities can also take enforcement action under the Housing Act 2004.

The Three Types of Damp — and Who Is Responsible for Each

Damp is not a single problem. Misidentifying the cause leads to failed remediation and continued liability. The three types have different causes, different fixes, and different liability profiles.

Rising Damp

Rising damp occurs when groundwater is drawn up through a wall or floor by capillary action. It is most common in older properties with a failed or absent damp-proof course (DPC). The tell-tale signs are a tide mark on the lower section of a wall (usually no higher than 1 metre), salt deposits or efflorescence, and plaster bubbling or flaking at low level. Rising damp is almost always a structural building fabric problem — this is squarely your responsibility under Section 11.

Fix: A specialist damp surveyor should confirm the diagnosis (do not rely on a salesperson offering “damp treatment” who may recommend expensive and unnecessary chemical injection). The fix may involve installing a new DPC, improving drainage around the property, or replacing damaged plaster with specialist renovation plaster. Temporary surface treatments will not solve a structural DPC failure.

Penetrating Damp

Penetrating damp enters the property through the building fabric: a failed roof, cracked or porous render, faulty pointing, defective guttering or downpipes, or poorly sealed windows and doors. It typically appears as isolated damp patches, often on external walls or ceilings, and worsens during or after rain.

Penetrating damp is entirely a maintenance and repair issue. Under Section 11, you are responsible for the roof, external walls, gutters, downpipes, and window frames. Delayed repairs to a leaking gutter are a common cause of significant damp damage that could have been prevented for the cost of a routine maintenance call.

Fix: Identify the specific entry point — use a damp meter and trace the moisture. Repair the defective element first. Then allow the structure to dry (this can take weeks or months depending on materials), and replaster or redecorate only once the cause is resolved.

Condensation

Condensation is the most common and most misunderstood form of damp. It occurs when warm, moisture-laden air meets a cold surface. The surface temperature drops below the dew point of the air and moisture condenses on the wall or window. Mould then grows in the damp conditions.

The liability for condensation depends on the cause. If the property lacks adequate heating, insulation, or ventilation for normal family use, the building fabric is contributing to the problem — that is your responsibility. Properties with inadequate heating systems (unable to maintain 18°C in living rooms and 21°C in bathrooms, per HHSRS standards), poor loft or wall insulation, no or blocked extractor fans in kitchens and bathrooms, and single-glazed windows in cold climates are all prone to condensation regardless of how the tenant behaves.

The tenant bears responsibility only where the property is otherwise adequate and the behaviour is genuinely exceptional: covering ventilation bricks, never using the extractor fan, drying very large quantities of laundry indoors in a small flat with no ventilation. Even then, the local authority environmental health officer and any court will look carefully at whether the building fabric is also contributing.

Improving your EPC rating — through better insulation, a more efficient heating system, or draught-proofing — reduces the likelihood of condensation forming. See our EPC landlord requirements guide for cost-effective improvements that raise your rating and reduce condensation risk.

Fix: Address ventilation first — install MVHR units, positive input ventilation (PIV), or at minimum ensure extractor fans in wet rooms are working and appropriately sized. Improve insulation to reduce cold bridge surfaces. Ensure the heating system can maintain HHSRS-compliant temperatures. Then remediate the mould itself.

How to Properly Remediate Mould

Surface treatment without fixing the underlying cause is the most common landlord mistake. The mould will return within weeks, and you will still be in breach of the Homes Act.

The correct remediation process:

1. Identify and fix the cause first. No surface treatment works until moisture ingress is stopped or condensation conditions are corrected.

2. Remove the mould properly. Use a mould-killing biocide wash (not bleach alone — it kills surface spores but does not penetrate porous surfaces). For significant mould growth on plaster or drywall, cutting out and replacing the affected sections is often necessary.

3. Dry the area fully. Use dehumidifiers and ensure good airflow. Do not redecorate until moisture readings confirm the substrate has dried — this takes longer than most people expect, especially in masonry.

4. Apply mould-resistant materials. Mould-resistant primer and paint reduce reoccurrence on surfaces but are not a substitute for fixing the underlying cause.

5. Confirm resolution in writing. Follow up with the tenant to confirm the issue is resolved. Retain contractor invoices describing the scope of work — these are your evidence for both tax purposes and any future dispute.

Documenting Damp Issues: Protecting Yourself

Documentation is your primary defence in any rent repayment order application or civil claim. Maintain a clear paper trail for every damp report:

• Log the report immediately: date, time, method of receipt, and the tenant’s exact description
• Acknowledge in writing within 24 hours: even a brief text or email confirming receipt and next steps
• Record your inspection: dated photographs, moisture meter readings, and your written assessment of the cause
• Keep contractor correspondence: quotes describing the diagnosis, invoices confirming the work done, and written confirmation of completion
• Follow-up confirmation: a written check with the tenant that the issue is resolved

Without dated documentation, a dispute becomes your word against the tenant’s. With it, you can demonstrate you received the report, investigated promptly, instructed a contractor, and completed remediation — which is exactly what Awaab’s Law requires.

Consequences of Failing to Act on Damp and Mould

Delaying or refusing to act on a damp report exposes you to multiple enforcement routes simultaneously:

Rent repayment orders: The First-tier Tribunal (Property Chamber) can order repayment of up to 12 months’ rent under the Housing Act 2004 (as extended by the Renters’ Rights Act 2025) where a landlord has committed a housing offence — including failing to comply with an improvement notice issued in relation to damp.

Civil damages: Tenants can bring county court claims for compensation equal to rent paid during the unfit period, damage to belongings from mould, and health impacts. Personal injury claims have a 3-year limitation period. Small claims (under £10,000) are heard in the small claims track without the need for a solicitor.

Local authority enforcement: Environmental health officers can inspect on a tenant complaint and issue improvement notices under Housing Act 2004 s.11–12. Fines under the Housing and Planning Act 2016 reach £30,000. Emergency remedial action — where the council does the work and recharges you — is available for immediate hazards.

Compliance certificate complications: A property with documented damp problems complicates your gas safety and electrical inspection records — surveyors note related structural issues, which can trigger additional enforcement action.

Preventing Damp Before It Becomes a Problem

Proactive management prevents expensive remediation and legal exposure. If you are self-managing, build regular property inspections into your maintenance schedule — at minimum annually. Focus on:

• Gutters and downpipes: clear them in autumn before heavy rain. Blocked gutters cause penetrating damp within months in properties with solid masonry walls.
• Roof: inspect for missing or slipped tiles, deteriorating flashing, and cracked ridge pointing after winter.
• Extractor fans: check they are operational and vented externally (not into the loft space).
• Heating system: service the boiler annually and confirm it can maintain HHSRS temperature thresholds (21°C living rooms, 18°C other rooms). A boiler service is also required for your gas safety certificate. Inadequate heating is a Category 1 hazard under the Decent Homes Standard — see that guide for the full HHSRS framework.
• Insulation: check loft insulation thickness — 270mm is the recommended minimum. Consider cavity wall insulation if absent. Both reduce cold bridge temperatures that cause condensation.

For a comprehensive overview of all maintenance and compliance obligations — including inspection records, safety certificates, and proactive repair strategies — see our landlord maintenance responsibilities guide.

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For a complete guide to your legal obligations as a landlord across all areas — from pre-let compliance and Right to Rent checks through deposit protection and tenancy management — see our how to be a landlord guide.