Mould around your windows can be incredibly frustrating.
You clean it off, only for it to come back a few weeks later. The room feels cold. Condensation appears every morning. Before long, you’re scrubbing black mould from the window frame again and wondering what you’re doing wrong.
The truth is, mould around windows is usually a symptom of a bigger problem. The mould itself isn’t the issue. The moisture causing it is.
Why Does Mould Around Windows Happen?
Windows are often one of the coldest surfaces in a property. When warm, moisture-laden air comes into contact with a cold surface, condensation forms.
Over time, that moisture creates the perfect environment for black mould to grow.
Common causes include:
- Poor ventilation
- High humidity levels
- Drying clothes indoors
- Inadequate extractor fans
- Cold spots and thermal bridges
- Heat loss around window reveals
- Insulation defects
Many people assume the windows need replacing, but that’s not always the case. In many properties, the real issue is poor airflow or hidden building performance problems elsewhere.
Why Does The Mould Keep Coming Back?
This is one of the biggest frustrations for homeowners and landlords.
You can wipe away the mould. You can paint over it. You can use specialist cleaning products.
But if the moisture remains, the mould will return.
Think of mould as the warning light on your dashboard. Removing the warning light doesn’t fix the fault.
To stop mould permanently, you need to understand where the moisture is coming from and why it isn’t leaving the building.
Is Black Mould Dangerous?
Black mould doesn’t just affect how your property looks.
It can contribute to respiratory problems, aggravate asthma symptoms, and affect indoor air quality. Children, elderly occupants and people with existing health conditions are often the most vulnerable.
If mould continues to spread despite repeated cleaning, it’s worth investigating the underlying cause before the problem becomes more extensive and expensive to resolve.
Mould In Rental Properties – What Landlords Need To Know
If you’re a landlord dealing with mould in rental property, expectations have changed significantly in recent years.
Damp and mould are increasingly being treated as health and safety issues rather than simple maintenance concerns. Landlords have a responsibility to investigate reports of mould and identify the underlying cause.
Simply advising tenants to open windows or wipe away condensation may not be enough if there are ventilation issues, insulation defects or other building-related problems contributing to the mould growth.
For landlords, recurring mould complaints can lead to unhappy tenants, increased maintenance costs, potential enforcement action and reputational damage.
Technology is also making it easier to spot potential problems before they become serious. Systems such as Switchee can monitor temperature, humidity and occupancy patterns within a property, helping landlords identify conditions that could lead to condensation and mould. This allows issues to be investigated earlier, reducing the risk of complaints, property damage and costly remedial work.
The sooner the root cause is identified, the easier and cheaper it is usually to resolve.
How AVT UK Can Identify the Cause of Mould in Your Property
Every property is different.
In some cases, mould around windows is caused by poor ventilation. In others, heat loss, thermal bridging or insulation defects are creating cold surfaces where moisture can condense.
At AVT UK, we use a range of building performance assessments to identify what’s really happening inside the property.
Depending on the issue, this may include:
- Heat 3D thermal heat loss surveys
- Ventilation assessments
- Air tightness testing
- Building performance evaluations
- Switchee smart monitoring
Rather than treating symptoms, these assessments help identify the underlying cause so you can make informed decisions about the right solution.
Stop Treating the Symptoms Of Mould — Find the Cause
If you’re constantly dealing with mould around your windows, there’s definitely a reason behind it.
Whether you’re a homeowner tired of cleaning the same black mould every few weeks and concerned about your health, or a landlord dealing with ongoing tenant complaints, understanding the cause is the first step towards fixing the problem properly.
AVT UK helps homeowners, landlords and property professionals identify heat loss, ventilation issues and moisture problems before they become bigger and more expensive to resolve.
Ready to find out what’s causing mould around your windows? Contact AVT UK today and we’ll help you identify the problem and tell you the most effective way to fix it.