How to Get Rid of Mould on Walls

Mouldy interior wall

How to prevent and remove mould on walls

Mould on walls is more than just an ugly spot in your home – it’s a big health concern too. Mould spores and damp patches can develop on your walls for a variety of reasons, but a lack of ventilation and proper airflow is usually the main culprit. In fact, everyday activities like cooking and showering can produce up to 0.5 litres of moisture, which can then linger in a room’s atmosphere if you haven’t got proper ventilation, causing dampness and mould growth on walls.

If you’re struggling to stop mould from appearing on your walls, it might indicate deeper issues causing its recurrence. In this health and safety guide, we’ll explore the reasons why mould spores may be appearing on your interior walls and offer tips on how to prevent mould and dampness on walls effectively.


  • Types of mould typically found on walls
  • What causes mould on walls?
  • How to remove mould from walls
  • Effective ways to prevent mould from coming back on your walls
  • Why removing mould from your house’s walls is important
  • Getting rid of mouldy walls for good

Types of mould typically found on walls

Mould found on internal walls often varies in type (there’s over 100,000 species of mould). 

Commonly, Cladosporium appears as a black or green substance on walls, thriving in both warm and cold conditions. Another type, Penicillium, typically blue or green, grows rapidly and is known for its musty odour. Alternaria, usually dark green or brown, is common in damp areas like bathroom walls or under leaky sinks.

What causes mould on walls?

While various factors contribute to interior wall condensation and mould growth, the main culprit is usually insufficient ventilation, especially with excess moisture around. In the UK, the trend towards better-insulated homes with draught excluders and multiple glazed windows traps humidity during daily activities, which then leads to excess moisture. This trapped moisture can create musty and unhealthy conditions in areas like bathrooms, bedrooms, kitchens, and living rooms.

Typical causes of mould on walls

  • Poor ventilation
  • Building faults
  • Condensation
  • Drying clothes
  • Inadequate heating
  • Cooking
  • Showering and bathing

How to remove mould from walls

When cleaning mould from walls, it’s important to understand that this process only removes the visible mould and does not kill the mycelium roots, the underlying structure of the mould. Therefore, while the surface may appear clean, the roots remain and will grow back.

Based on this information, we wouldn’t advise on ‘cleaning’ your mouldy walls, as you won’t be tackling the root cause of the problem. If you’re seeking ways to permanently remove mould from your walls, keep reading for some DIY tips, or get in touch with one of our mould specialists.

Mould on wall

Effective ways to prevent mould from coming back on your walls

As discussed in the previous paragraph, cleaning mould from walls is only a temporary fix and does not address the root cause of mould growth. To effectively prevent mould appearing on your interior walls, it’s essential to tackle the underlying issues, primarily excess moisture.

4 measures you can implement at home

Opening windows

Fresh air helps to reduce indoor humidity levels, making it harder for mould to thrive on your walls. This is especially important in areas like kitchens and bathrooms where moisture is frequently generated.

Drying clothes outdoors

Whenever possible, dry clothes outside instead of indoors. Drying clothes inside can significantly increase indoor humidity levels, creating ideal conditions for mould growth.

Ventilation systems

Design, install and use ventilation systems, particularly in high-moisture areas like bathrooms and kitchens. These systems help to expel humid air from your home and bring in drier air, reducing overall moisture levels.

Using extractor fans

In rooms where windows are not sufficient for proper ventilation, use extractor fans (hotels use them for a reason!) These are particularly useful in kitchens and bathrooms to quickly remove steam and humid air generated from cooking, washing, or bathing.

Why removing mould from your house’s walls is important

The presence of mould exposure on your walls poses a serious health risk to occupants. Types of mould, such as black mould, emit allergens and mycotoxins that can cause health problems like nasal blockages, coughs, skin rashes, and eye irritation.

Beyond health risks, mould can also weaken and disfigure your walls, reducing your property’s lifespan and leading to higher maintenance costs. Whether you’re a landlord, part of a housing association, or a homeowner, Cornerstone offers extensive solutions to safeguard your property and prevent mould growth on walls.


Getting rid of mouldy walls for good

Throughout the UK, tenants are frequently left to cope with poor living conditions, such as dampness and serious mould issues, with little help from landlords or agents. If you see dampness, condensation, or mould growth on your walls, it’s vital you investigate it as soon as possible.
Leveraging SMART knowledge, our industry experts use state-of-the-art technology to tackle penetrating damp, black mould, and condensation problems throughout commercial and domestic properties. We assist both public sector professionals managing social housing under the Homes (Fitness for Human Habitation) Act 2018, and private landlords legally required to protect tenants from internal atmospheric issues, ensuring effective mould removal.

About the Author

David Bly

David Bly

Managing Director

David has an Engineering and Management background having been involved with the property damage management industry sector for the last 20 years encompassing the management and dissemination of key reporting protocols. His field-based experience aligns to the creation and production of unique reporting systems that serve to uphold professionalism and transparency of data interpretation for the industries Cornerstone serve.

In addition, his experience aligns to the understanding of damp, condensation and mould related issues in properties combining all industry approved surveying techniques to deliver a bespoke service clients demand.

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