Damp and Mould in Rental Properties: Your Obligations as a Landlord

When a tenant reports damp or mould, the days of blaming "lifestyle choices" and telling them to open a window are over. The legal landscape has shifted significantly — particularly since Awaab's Law came into force in October 2025 — and landlords who don't act quickly face serious consequences.

Here's what you're actually required to do.

The legal framework

Your obligations around damp and mould come from multiple sources. Knowing which one applies determines your response timeline and your liability.

1. Landlord and Tenant Act 1985, Section 11

This is the foundation. Section 11 of the Landlord and Tenant Act 1985 places a statutory duty on landlords to keep in repair the structure and exterior of the dwelling, plus installations for water, gas, electricity, sanitation, and heating.

Damp caused by structural issues — a leaking roof, failed damp-proof course, cracked render, blocked guttering — is your responsibility under Section 11. This applies to all private landlords in England and Wales, regardless of what the tenancy agreement says. You cannot contract out of Section 11.

2. Homes (Fitness for Human Habitation) Act 2018

Since March 2019, the Homes Act 2018 requires that all private rented properties are fit for human habitation at the start of and throughout the tenancy. Fitness is assessed against 29 factors from the Housing Health and Safety Rating System (HHSRS), which includes:

Damp and mould growth (Category 1 hazard if severe)
Excess cold (linked to condensation damp)

If a property is unfit because of damp or mould, the tenant can take you to court directly — without needing the local authority to act first. The court can order repairs and award compensation.

3. Awaab's Law (Social Housing Regulation Act 2023)

Awaab's Law came into force on 27 October 2025. It was named after Awaab Ishak, a two-year-old who died in December 2020 after exposure to mould in his family's Rochdale housing association flat.

Currently, Awaab's Law applies directly to social housing landlords, with mandatory response timescales:

Hazard type	Investigation deadline	Make-safe deadline
Emergency (imminent risk of harm)	24 hours	24 hours
Non-emergency damp/mould	10 working days	5 working days after investigation

For private landlords: The Renters' Rights Act 2025 gives the government power to extend Awaab's Law to the private rented sector. The government has confirmed it intends to consult on this extension — timing and details are expected in 2026.

Even before formal extension, the direction of travel is clear. Tribunals and courts are already applying the principle that damp and mould must be dealt with promptly. A private landlord who takes weeks to respond to a mould report is increasingly exposed.

What counts as a landlord's responsibility

Not all damp is your fault, but the burden of proof has shifted. Here's how responsibility typically breaks down:

Type of damp	Cause	Who's responsible
Rising damp	Failed or absent damp-proof course	Landlord (structural)
Penetrating damp	Roof leak, cracked walls, failed pointing, blocked gutters	Landlord (structural)
Condensation damp caused by building defects	Poor ventilation design, single glazing, no extractor fans, insufficient insulation	Landlord (structural/design deficiency)
Condensation damp caused by tenant behaviour	Drying clothes indoors with windows shut, blocking ventilation, keeping heating off	Tenant — but only if the building provides adequate ventilation and heating

The critical distinction: if the property lacks adequate ventilation or insulation, and condensation forms as a result, that's a building defect — not tenant lifestyle. Awaab's Law explicitly states it is "unacceptable for social landlords to assume that the cause of a hazard, such as damp and mould, is due to the tenant's lifestyle." Private tribunals are following the same reasoning.

What to do when a tenant reports mould

Step 1: Respond quickly (within 48 hours)

Acknowledge the report in writing. Even if you can't inspect immediately, responding quickly matters — it demonstrates you took the complaint seriously.

Step 2: Inspect or arrange inspection (within 14 days)

Determine the cause. Is it structural (penetrating damp, rising damp, ventilation defect) or condensation from tenant behaviour?

For anything beyond obvious surface condensation, get a damp survey from a qualified surveyor — not a damp-proofing company (they'll always recommend their own products). A RICS-qualified surveyor costs £200–£400 and provides an independent assessment.

Step 3: Fix structural causes (as soon as practicable)

If the damp is caused by a structural issue:

Leaking roof: Repair within 28 days (sooner if water is actively entering the property)
Failed pointing/render: Schedule repair
No extractor fans: Install mechanical extraction in bathroom and kitchen
Inadequate insulation: Address where practicable
Blocked gutters/downpipes: Clear immediately

Document every action: date, what was done, who did it, cost. This is your evidence if the tenant escalates.

Step 4: Address mould itself

Removing the cause isn't enough if mould is already present:

Surface mould on walls: Professional mould treatment, then redecorate with anti-mould paint
Mould in grout/sealant: Replace affected sealant
Mould behind plasterboard: Remove affected plasterboard, treat, replace
Extensive mould (structural penetration): Specialist remediation — get quotes from certified mould remediation companies

Do not just paint over it. Mould that returns after cosmetic treatment strengthens the tenant's case that you haven't addressed the root cause.

Step 5: Document everything

Keep records of:

The tenant's initial report (date and content)
Your response and timeline
Inspection findings (photos, surveyor report)
Remedial work carried out (invoices, before/after photos)
Any advice given to the tenant about ventilation

What happens if you don't act

Local authority enforcement (HHSRS)

If a tenant contacts their local authority, an Environmental Health Officer can inspect the property under the Housing Act 2004. If they find a Category 1 hazard (serious damp/mould), the council must take enforcement action:

Improvement notice — requiring specific repairs within a set timeframe
Prohibition order — preventing use of part or all of the property
Emergency remedial action — the council does the work and bills you
Civil penalty — up to £30,000 per offence

Tenant court action (Homes Act 2018)

Since March 2019, tenants can take you to county court directly:

Court can order repairs
Court can award compensation for discomfort, inconvenience, and damage to belongings
Awards typically range from £1,000–£10,000 depending on severity and duration
In severe cases involving health impacts, awards can be higher

Rent Repayment Orders

If the property is so bad it constitutes a Category 1 hazard and you've been prosecuted or issued a civil penalty, the tenant can apply for a Rent Repayment Order — up to 12 months' rent.

Prevention is cheaper than remediation

Preventive action	Cost	What it prevents
Extractor fan (bathroom)	£150–£300 installed	Condensation mould in bathrooms
Extractor fan (kitchen)	£150–£300 installed	Kitchen condensation and grease mould
Loft insulation (270mm)	£300–£600	Condensation on cold surfaces
Gutter clearing	£75–£150	Penetrating damp from overflow
Damp survey	£200–£400	Identifies root cause before it spreads

Compare these to a £30,000 civil penalty, £10,000 compensation award, or 12 months' rent repayment.

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