Mould, Damp, and the Fitness for Human Habitation Standard

Since 20 March 2019 every rented home in England has had to be fit for human habitation when let, and to remain fit throughout the tenancy. The duty is set out in section 9A of the Landlord and Tenant Act 1985, inserted by the Homes (Fitness for Human Habitation) Act 2018.

Section 10 of the 1985 Act lists the matters that are taken into account in deciding whether a dwelling is fit. Since the 2018 reforms these explicitly include:

• Damp in any form (rising, penetrating, condensation);
• Internal arrangement — including ventilation, which is the proximate cause of most condensation mould;
• Natural lighting;
• Water supply, drainage, and sanitary conveniences;
• Facilities for preparation and cooking of food and disposal of waste;
• Freedom from any serious hazard defined by reference to the Housing Health and Safety Rating System (HHSRS) under Housing Act 2004 Part 1. Category 1 hazards under HHSRS — which severe mould often is — automatically engage the local authority's duty to act.

This is a tenant-facing duty: the tenant can sue the landlord directly in the county court for breach. The landlord cannot contract out of it (s.9A(3)).

The duty does not apply where the cause is the tenant's own breach of an express term of the tenancy (e.g. blocking ventilation, never opening windows, ignoring obvious leaks). But in most damp/mould cases the cause is a building defect — and condensation caused only by household activity in a property without adequate ventilation is still the landlord's responsibility under modern case law (Quick v Taff-Ely BC [1986]).

After the coroner found in 2022 that two-year-old Awaab Ishak died from prolonged exposure to mould in his social-housing flat in Rochdale, Parliament passed the Social Housing (Regulation) Act 2023. Its implementing regulations — the Hazards in Social Housing (Prescribed Requirements) (England) Regulations 2025 — set hard statutory deadlines for social landlords to investigate and act on hazards.

The key timescales are:

• Emergency hazards (life-threatening or category 1 with imminent risk): investigate and start emergency remedial action within 24 hours of becoming aware.
• Significant hazards (other category 1 or serious category 2): investigate within 14 days; complete repairs within an additional period set in the regulations (currently 7 days for emergency completion, longer for non-emergency).
• Written report to the tenant within 3 working days of investigation, summarising findings and the action plan.

Awaab's Law applies to social landlords only (registered providers of social housing — local authorities, housing associations, ALMOs). It does not apply directly to private landlords yet. Breach is an actionable matter for the Regulator of Social Housing and can be a defence/counterclaim against a possession claim. The tenant can also sue under s.9A LTA 1985 in parallel.

The Renters' Rights Act 2025 extends similar (but not identical) duties to the private rented sector once implementing regulations are made — expected during 2026–2027. Until then, private tenants rely on s.9A, HHSRS, and council enforcement.

If you rent privately and have mould or damp the landlord is ignoring, you have four parallel routes:

1. Written complaint to the landlord or agent. Put it in writing (email is fine). Include photographs with dates, a description of the affected rooms, and any medical impact (asthma, persistent cough, sleeping difficulty). Ask for inspection within 14 days and remedial action within a reasonable period thereafter. Keep copies of everything.
2. Complain to Environmental Health at your local council. Under the Housing Health and Safety Rating System (Housing Act 2004 Part 1), an officer will inspect and rate the hazard. If they find a Category 1 hazard they have a duty to take enforcement action — typically an improvement notice on the landlord. A Category 2 hazard is at the council's discretion. Once a council enforcement notice is in force, the landlord cannot serve a Section 21 notice for the next 6 months (the "retaliatory eviction" rules in the Deregulation Act 2015 s.33).
3. Sue under s.9A LTA 1985 for breach of the fitness-for-habitation duty. You can ask the county court for: (a) an injunction requiring repairs by a specified date; (b) damages for the period the property was unfit; (c) costs. Damages are typically calculated as a percentage of rent (30–50% for serious mould affecting living/sleeping areas), often plus additional damages for any medical injury caused. Get free advice from Shelter, a housing solicitor, or a tenants' union before issuing.
4. Withhold rent only after taking specific legal advice. The general rule is that you must continue paying rent or risk possession proceedings for arrears. There are narrow procedures (set-off, deductions) that allow tenants to spend on emergency repairs and deduct from rent, but they require strict notice and evidence. Do not stop paying rent without confirming the procedure with a solicitor.

Whether you are escalating to the council, suing under s.9A, or building a defence to possession proceedings, the evidence pack determines the outcome:

• Photographs dated by the camera EXIF, taken in normal daylight and with a known reference object for scale. Photograph mould on walls, ceilings, behind furniture, around windows, in cupboards, and in bathrooms. Re-photograph monthly to show progression.
• Hygrometer readings — a £10 humidity meter recording over 65% relative humidity for prolonged periods is strong evidence of inadequate ventilation. Take readings in different rooms at different times of day.
• Medical evidence — visits to your GP about respiratory symptoms with mention of the housing conditions in the consultation note. Ask for a copy of the relevant entries in your medical record. Keep a log of asthma medication use, hospital visits, days off work or school.
• Correspondence — every written or recorded report to the landlord or agent, with the date sent and any reply (or absence of reply). For phone calls, follow up in writing afterwards.
• Tenancy and inventory documents showing the property's condition at move-in. A clean check-in inventory makes it harder for the landlord to blame you.
• Expert reports — if your case is going to court or the council is uncertain, commission a damp and mould survey from a member of the Property Care Association or a chartered building surveyor. Costs are typically £400–£1,200 and recoverable as costs if you win.

Time limits to be aware of:

• S.9A claims are subject to the Limitation Act 1980 — 6 years from the breach. Each day the property remains unfit is a fresh breach.
• Council enforcement has no fixed deadline but officers must act on Category 1 hazards "as soon as reasonably practicable".
• Awaab's Law deadlines run from when the landlord becomes aware. Recording the date of your written complaint is essential.
• Section 21 retaliatory-eviction protection lasts 6 months from the date of the council enforcement notice. Plan accordingly if your tenancy might be ended.

The legal landscape for mould and damp is moving fast:

• 2023 — Social Housing (Regulation) Act 2023 enacted. Created the framework for Awaab's Law.
• 2024 — DLUHC published the Decent Homes Standard 2024 consultation, signalling extension to PRS.
• 2025 — Awaab's Law implementing regulations made for social housing. Phased commencement begins.
• 2025 — Renters' Rights Act 2025 enacted, including extension of the Decent Homes Standard to the private rented sector (commencement expected late 2026 / 2027 by SI).
• 2026–2027 — Phased commencement of the PRS Decent Homes Standard and of the Renters' Rights Act provisions on hazards. Watch GOV.UK and the FCA Handbook for SI numbers as they are made.

If you are a landlord or letting agent, build mould inspection into your pre-tenancy and mid-tenancy checks now. Once Awaab's-style duties extend to PRS, ignoring a written complaint will be hard to defend.