Damp and mould: from a tenant complaint to a documented response

For years the standard response to a report of mould was to attribute it to condensation, advise the tenant to ventilate and heat the property, and close the case. That position has collapsed, both in law and in public expectation, and landlords and agents still operating it are exposed in a way they often have not registered.

The shift has been driven by coroners' findings, by the Housing Ombudsman's severe maladministration determinations, and by legislation extending and sharpening obligations around hazards in rented homes. The direction is consistent even where the detail differs between tenures: damp and mould are a hazard to be investigated and remedied, and the burden of explaining is on the landlord rather than the tenant.

The legal backdrop, briefly and with a caveat

Several regimes overlap. Fitness for human habitation obligations, the hazard rating system used by local authorities, repairing covenants implied into most tenancies, and — in social housing — specific statutory timescales for investigating and remedying damp and mould introduced by recent legislation. Proposals to extend equivalent timescales to the private rented sector have been consulted on and legislated for in stages.

Because commencement dates, applicable timescales and the tenures covered have moved more than once, this is precisely the area to check against current government and Ombudsman guidance rather than relying on a summary. What is not in doubt is the direction, and a landlord who waits for the final detail before changing how they respond is likely to be caught by the interim.

Why 'it's condensation' fails even when it is condensation

Condensation is a real mechanism and often part of the picture. The problem with reaching for it first is that it is an explanation, not an investigation, and it places the cause with the occupant before anybody has looked. Where there is also a failed extractor fan, a cold bridge at a lintel, inadequate insulation, a blocked airbrick or a slow leak behind a bath panel, attributing the mould to drying washing indoors is simply wrong.

Even where occupant behaviour genuinely contributes, the modern expectation is that the landlord addresses what the building contributes. A property that cannot be heated affordably or ventilated effectively is producing the condition it is blaming the tenant for, and that argument has stopped working in front of ombudsmen and courts.

What a defensible response looks like

The pattern that holds up is unremarkable and consistently absent: acknowledge the report quickly and in writing; inspect within a defined period and record what was found, including photographs and, where relevant, moisture readings; identify the probable cause rather than the category; set out the remedial works with dates; carry them out; and go back afterwards to confirm the problem has resolved rather than closing the job when the operative leaves.

That final step is the one most often skipped and the one that most often turns a complaint into a determination. Mould wiped off and painted over returns within weeks if the cause is untouched, and a tenant who reports it a second time into a system that logs it as a new, unrelated job is a tenant who will eventually go to the Ombudsman with a timeline the landlord cannot match.

Repeat reports are the signal, not the nuisance

Operationally, the single highest-value change most portfolios can make is to link repeat reports on the same property. Where each report opens an independent job, a property with a chronic defect looks like a series of minor complaints, and nobody sees the pattern until it is formal.

A property-level history — every report, inspection, work order and outcome against the address rather than against the ticket — surfaces the chronic cases automatically. It also answers the question an Ombudsman asks first, which is what the landlord knew and when, and is almost impossible to reconstruct afterwards from an email archive.

Vulnerability changes the urgency

The same mould in two properties does not carry the same risk. Respiratory conditions, very young children, elderly or immunosuppressed occupants all raise both the severity and the expected speed of response, and the expectation is that the landlord knows enough about the household to make that judgement and records the basis for it.

This sits uncomfortably with data minimisation instincts, and the resolution is proportionality rather than avoidance. Recording that a household includes a resident with a respiratory condition relevant to prioritising repairs is a legitimate and defensible purpose; the failure mode that attracts criticism is knowing and not acting, not knowing at all.

Agents, landlords and the gap between them

On managed portfolios the recurring failure is authorisation. The agent inspects, identifies works, and waits for the landlord to approve expenditure. Where the landlord is slow, unreachable or disputes the need, the clock keeps running and the tenant is living with the hazard throughout.

Management agreements that set a spend threshold for hazard remediation which the agent may authorise without prior approval remove most of this delay, and the agent should record every attempt to reach the landlord where the threshold is exceeded. A documented chain of unanswered approval requests is a materially better position than a gap in the record.

The underlying shift is simple to state and harder to operationalise: damp and mould are now treated as a hazard the landlord must find and fix, not a dispute between landlord and tenant about who caused it. The portfolios that will handle the tightening comfortably are the ones already recording what they were told, what they found, what they did, and whether it worked.

Finding it before the tenant reports it

Every process described above begins with a report, which means it begins late. Tenants frequently do not report damp until it is extensive, for reasons that are entirely predictable: a belief they will be blamed, a fear of rent increase or eviction, or simply a sense that it is their fault for drying washing indoors.

Routine property inspections are where a portfolio finds the problem earlier, and they only work if the inspector is looking for it specifically. A general condition check does not reliably surface early mould behind furniture, in wardrobes against external walls, or around window reveals. A short standing checklist covering the known locations, with photographs taken each visit, produces a comparable record over time.

Comparability is the valuable part. Two photographs of the same reveal six months apart answer a question that no amount of narrative does, and they also protect the landlord where a condition genuinely has not worsened.

Fabric measures and the ones that backfire

Where investigation identifies a building cause, the remedy is usually a fabric measure: improving extraction, addressing a cold bridge, correcting failed insulation, clearing blocked ventilation, or repairing a defect letting water in. These cost more than a mould wash and are the only things that resolve the problem.

It is worth being alert to measures that make matters worse. Replacement windows fitted without trickle vents into a property with no mechanical ventilation reduce air changes and can turn an intermittent problem into a persistent one. Insulation applied to part of a wall can move the cold surface rather than remove it. Sealing an unused chimney without ventilating the flue is a recurring cause of damp in older stock.

Recording the diagnosis alongside the works matters here. Where a later report arrives, the file showing what was found, what was done and on what reasoning allows the next person to build on it rather than starting again — and distinguishes a landlord managing a building from one responding to complaints.