The Landlord's Guide to Dealing with Damp and Mould

Damp and mould are the issues that every Middlesbrough landlord will face at some point. The combination of older housing stock, the north-east climate, and the physics of moisture in enclosed spaces makes it virtually inevitable. How you respond when it is reported — and what you do to prevent it — will determine whether the problem costs you a few hundred pounds or develops into something far more serious and expensive.

The regulatory and legal landscape around damp and mould in rental properties has shifted significantly in recent years. Following a series of high-profile cases nationally, the government, local councils, and the courts have all taken a harder line on landlords who fail to address these issues. Understanding your responsibilities and acting on them promptly is no longer optional.

Understanding the Three Types of Damp

Not all damp is the same, and the correct response depends on identifying the cause accurately.

Condensation damp is by far the most common type in Middlesbrough rental properties. It occurs when warm, moist air meets cold surfaces — typically external walls and windows — and the moisture in the air condenses into water. This creates the conditions for black mould growth, particularly in corners, behind furniture, and around windows.

Condensation is influenced by both the building and the occupants. Poorly insulated walls, single-glazed windows, and inadequate ventilation all contribute. So does the moisture generated by cooking, bathing, drying clothes indoors, and simply breathing. In a typical occupied house, residents generate several litres of moisture per day.

Rising damp occurs when moisture from the ground travels upward through walls by capillary action, typically where the damp-proof course has failed or does not exist. It presents as a tide mark on lower walls, often with salt deposits, and can affect plaster and decoration. Rising damp is less common than condensation but more structural in nature.

Penetrating damp is caused by water entering the building from outside — through damaged roofing, cracked render, defective pointing, leaking gutters, or damaged window seals. It presents as damp patches that worsen during or after rain and can appear at any height on the wall.

Your Legal Responsibilities

Under the Landlord and Tenant Act 1985 (Section 11), you are responsible for keeping the structure and exterior of the property in repair, and for maintaining installations for heating, hot water, and sanitation. Damp caused by structural defects — rising damp, penetrating damp from a leaking roof or damaged walls — falls squarely within this obligation.

The Homes (Fitness for Human Habitation) Act 2018 goes further. Since March 2019, tenants can take their landlord to court if the property is unfit for habitation due to damp and mould. The court can order repairs, award compensation to the tenant, and require the landlord to pay legal costs. There is no minimum severity threshold — if the damp or mould makes the property unfit, you are liable.

Awaab's Law — named after the tragic death of a two-year-old in a mould-affected housing association property in Rochdale — has introduced specific timeframes for addressing hazards in social housing. While the statutory requirements currently apply only to social landlords, the direction of travel is clear. Private landlords in Middlesbrough should expect similar requirements to apply to them in the coming years, and acting as though they already do is both ethically and legally prudent.

What to Do When a Tenant Reports Damp or Mould

The first and most important step is to take the report seriously and respond quickly. Do not dismiss it as a lifestyle issue before investigating. While condensation can be influenced by tenant behaviour, assuming the tenant is at fault without evidence is a position that will not hold up if challenged.

Step one: Inspect the property. Visit the property promptly and assess the extent and location of the damp or mould. Take photographs and note which rooms are affected, which walls (internal or external), and whether the problem is localised or widespread.

Step two: Identify the cause. Is the mould around windows and in corners of external walls? That suggests condensation. Is there a damp tide mark on ground-floor walls? That could be rising damp. Are there damp patches on ceilings or upper walls that worsen after rain? That points to penetrating damp.

If the cause is not obvious, commission a professional damp survey. A qualified surveyor can use moisture meters and thermal imaging to identify the source accurately. In Middlesbrough, a standard damp survey costs between £200 and £400 — money well spent if it prevents you from treating the wrong problem.

Step three: Carry out repairs. Once the cause is identified, address it. For penetrating damp, this means repairing the roof, guttering, pointing, or render that is allowing water in. For rising damp, it may mean installing or replacing the damp-proof course. For condensation, the solutions are typically a combination of improved ventilation, better insulation, and ensuring the heating system is adequate.

Addressing Condensation Specifically

Because condensation is the most common issue in Middlesbrough properties — particularly in the Victorian and Edwardian terraces common in TS1, TS3, and TS5 — it deserves focused attention.

Improve ventilation. Ensure extractor fans are installed and working in the kitchen and bathroom. Trickle vents on windows should be open. Consider installing a positive input ventilation (PIV) system, which gently introduces filtered air into the property and pushes moist air out. PIV systems cost £300 to £500 to install and are one of the most effective single interventions for condensation in older properties.

Improve insulation. Cold surfaces cause condensation. If external walls are uninsulated, consider cavity wall insulation or internal wall insulation. Ensure the loft is insulated to current standards (at least 270mm). These improvements also boost the EPC rating, which has its own regulatory benefits.

Ensure adequate heating. A property that is consistently underheated is more prone to condensation. The heating system must be capable of maintaining a reasonable temperature throughout the property. If the boiler is old, inefficient, or undersized, replacement may be necessary.

Treat existing mould. Mould should be treated with a fungicidal wash — not simply painted over. For minor cases, a mould-removing spray applied to affected areas is sufficient. For more extensive growth, professional mould remediation may be needed. After treatment, allow surfaces to dry completely before redecorating with anti-mould paint.

The Tenant's Role

While the landlord is responsible for the structural causes of damp and for providing adequate ventilation and heating, tenants also have a role in managing condensation. Using extractor fans when cooking and bathing, opening windows for ventilation when weather permits, not blocking trickle vents, and avoiding drying large amounts of laundry on radiators all help reduce moisture levels.

However — and this is crucial — you cannot simply hand a tenant a leaflet about condensation and consider the problem addressed. If the property has inadequate ventilation, poor insulation, or an insufficient heating system, tenant behaviour will not solve the problem. The landlord must fix the building first, and then tenants can do their part to maintain it.

The Cost of Inaction

Ignoring damp and mould does not make it go away. It makes it worse. Untreated mould spreads, damages decorations and furnishings, and creates health risks — particularly respiratory issues for children, elderly tenants, and those with existing conditions like asthma.

The financial costs of inaction are also significant. A tenant who takes their landlord to court under the Homes Act can receive compensation running into thousands of pounds. Middlesbrough Council can serve improvement notices that require remediation within specific timeframes, with civil penalties of up to £30,000 for non-compliance. And a property that develops a reputation for damp issues will struggle to attract and retain good tenants.

Addressing damp properly when it first appears costs a fraction of dealing with it after years of neglect.

Getting Professional Help

At Ascot Knight, damp and mould management is a core part of our property management service. We conduct regular property inspections that identify early signs of damp before they become serious problems. When issues arise, we arrange professional assessments, commission appropriate remediation, and work with tenants to ensure the property is maintained correctly.

If you are a Middlesbrough landlord dealing with a damp or mould issue — or if you want to ensure your property is properly protected — contact our team. We will help you understand your obligations, identify the right solution, and protect both your tenants and your investment.