Overview

Damp and mould are serious health hazards under the Housing Health and Safety Rating System (HHSRS) and are subject to strict timescales under Awaab's Law (Renters Rights Act). This guide covers all three types of damp, your legal obligations, and practical prevention steps — including guidance you can share with tenants at move-in.

The Three Types of Damp

• Condensation — the most common type. Caused by moisture in the air meeting cold surfaces. Usually a combination of tenant behaviour and inadequate heating or ventilation. Appears as black mould on walls, ceilings, and window frames.
• Penetrating damp — water ingress through walls, roof, windows, or doors. A structural issue requiring repair. Appears as damp patches after rain, often on external walls or ceilings.
• Rising damp — ground moisture travelling up through walls via capillary action. Requires a damp-proof course. Appears as tide marks on lower walls, typically below 1 metre.

Awaab's Law — Current Position for Private Landlords

Private landlords are already subject to significant repair and hazard obligations under existing law:

• Section 11, Landlord and Tenant Act 1985 — obligation to keep the structure, exterior, and installations in repair. Repairs must be carried out within a reasonable time of notification.
• Homes (Fitness for Human Habitation) Act 2018 — the property must be fit for human habitation at the start and throughout the tenancy. Tenants can sue directly in court without going through the local authority.
• Housing Health and Safety Rating System (HHSRS) — local authorities can inspect and serve improvement notices or prohibition orders for Category 1 hazards, including serious damp and mould.

In practice, private landlords should treat damp and mould reports as urgent. Prompt investigation and repair is both a legal obligation and the best protection against enforcement action and civil claims.

Preventing Condensation — Landlord Actions

• Ensure adequate ventilation: extractor fans in kitchen and bathroom, trickle vents in windows
• Ensure the heating system can maintain 18°C throughout the property (21°C in living areas)
• Insulate cold walls and loft to reduce cold spots where condensation forms
• Check and clear any blocked air bricks or vents
• Provide a condensation information sheet to tenants at move-in (see section below)
• Repair any structural defects that allow water ingress — leaking roofs, blocked gutters, damaged pointing

Signs to Look For During Inspections

• Water droplets on windows or walls (condensation)
• Black mould on walls, ceilings, window frames, or sealant (condensation)
• Musty smell in rooms, especially bedrooms and bathrooms
• Peeling wallpaper or paint
• Tide marks on lower walls below 1 metre (rising damp)
• Damp patches on walls or ceilings after rain (penetrating damp)
• Mould behind furniture pushed against external walls

Tenant Guidance — Share at Move-In

Provide the following guidance to tenants in writing at the start of every tenancy. This both helps prevent condensation and demonstrates that you have fulfilled your duty to advise tenants on property care.

• Open windows when cooking or showering; use extractor fans and leave them running for at least 15 minutes after use
• Keep heating on a low, consistent temperature rather than switching it off completely — cold properties cause condensation
• Dry clothes outdoors or use a vented tumble dryer — not on radiators or indoors without ventilation
• Leave a gap of at least 50mm between furniture and external walls to allow air circulation
• Report any signs of damp or mould to the landlord immediately — do not leave it to worsen
• Do not block air vents, trickle vents, or extractor fans

Responding to a Damp or Mould Report

1. Acknowledge in writing immediately — confirm you have received the report and will investigate
2. Inspect promptly — investigate as soon as reasonably practicable. Prompt inspection is good practice and demonstrates you are meeting your obligations under Section 11 LTA 1985 and the Homes (Fitness for Human Habitation) Act 2018
3. Identify the type and cause — do not assume it is condensation without checking for structural causes
4. Arrange remedial works — fix the cause, not just the symptom. Painting over mould without fixing the cause is not acceptable
5. Document everything — dates, photos, actions taken, contractors instructed, works completed
6. Follow up — check the works have resolved the issue and the mould has not returned

Penalties for Non-Compliance

• Failure to carry out repairs within a reasonable time: civil claim by tenant under Section 11 LTA 1985 and/or the Homes (Fitness for Human Habitation) Act 2018
• Local authority enforcement notices and improvement orders under HHSRS (for Category 1 hazards including serious damp and mould)
• Civil claims from tenants under the Homes (Fitness for Human Habitation) Act 2018
• Rent repayment orders
• Prosecution in serious cases