Black mould and damp around windows of a house

How to Stop Damp Around Windows?

Key Takeaways

Identify the Cause: Conduct a damp survey to identify the root cause of damp around windows, which can be condensation, rising damp, or penetrating damp. Addressing Condensation: Use pan lids and an extractor hood while cooking to reduce moisture. Close kitchen and bathroom doors during activities that release moisture. Activate extractor fans during showers and ensure proper ventilation while using appliances like washing machines. Enhancing Ventilation: Install energy-efficient extractor fans or consider whole-house ventilation systems. Capitalize on warmer weather by opening windows for increased airflow. Maintaining Moisture Control: Wipe down cold surfaces after cooking or bathing to control moisture. Ensure adequate heating and energy efficiency to raise interior surface temperatures. Dealing with Black Mould: Black mould thrives in high humidity; poor ventilation can contribute to its growth. Ageing or improperly installed windows may be susceptible to future mould growth; uPVC and synthetic materials are more resistant.   Damp can occur anywhere. Walls, ceilings, skirtboards, floors, and even windows. But today we are just talking about damp that arises around the windows. There can be plenty of reasons why windows in your house are incurring damp. Maybe there's some leakage in the pipes that are running around the windows, or perhaps the rainwater is falling directly on the wooden window frames themselves. The cause can be any, and if you want to stop damp around windows, you must find out why it is happening in the first place. To find that out, a damp survey can help. Once you know what's been causing the damp around the windows, there are some steps that you can take to get rid of it. Let's talk about what these steps are. Appearance of mould near a window  

Why Damp Occurs Around Windows?

When you see damp near your window and feel overwhelmed about how to solve damp-related problems, it is critical to investigate the many different aspects of the problem. Several complicated factors might potentially contribute to the existence of moisture near your home's windows, and each of these complexities requires careful thought. Disregarding any of these criteria may have consequences, including challenges to the integrity and operation of your windows. Thus, a complete and broad examination of the numerous aspects involved in damp-related issues is required to guarantee a complete and successful rehabilitation approach. Staying in context, let's have a look at why there might be damp around the windows of your house:

There Might Be Condensation

Condensation usually causes wetness near windows, which is a common concern in homes. This phenomenon arises when residents do activities such as washing, showering, or cooking, resulting in warm air saturated with moisture. The collection of wet air adds to the formation of damp conditions in the living area. When warmer, humid air comes into contact with more excellent surfaces, it undergoes a phase shift, causing the moisture in the air to convert from gaseous to liquid. Condensation is a common occurrence on windows, mainly single or thin double-glazed ones. Because these windows have lower surface temperatures than the surrounding environment, they are particularly susceptible to condensation. Condensation may form around windows when there is a temperature difference between the window area and well-insulated areas of your home. While a well-insulated home typically alleviates this worry, any compromise in the window's integrity may result in a progressive worsening of condensation on and around the window over time. If your window has troubles, such as a compromised seal, a deteriorating frame, or a faulty lintel, it might cause a cascade of problems. Ignoring these concerns may hasten the progression of damage, perhaps resulting in the development of penetrating damp or even more severe consequences well before the visible manifestation of condensation occurs. A woman cleaning the windows in her house

Rising Damp Can Also Cause Damp Around Windows

Rising damp, a type of moisture, occurs when groundwater infiltrates the walls of your house by capillary action. If your house has windows at the ground level, it may be vulnerable to rising damp, a phenomenon that usually grows only a meter above the ground. To address this situation, it is recommended that you use the services of a skilled damp proofing professional to investigate the possibility of implementing or correcting a damp proof course to prevent the recurrence of damp troubles. Black mold window frames

Penetrating Damp As the Cause Behind Damp Around Windows

Penetrating damp occurs when water enters a home owing to structural or damp-proofing flaws. This can happen if drains get clogged, causing excess to seep into the walls, or if a property's pointing fails, allowing rain and moisture to pool within the walls. Windows, which essentially act as openings in the property's walls, can become a potential source of damp if not correctly maintained. Professional care is required to avoid such problems and maintain resistance against the unpredictable conditions of the outdoors. Your window might fail due to a variety of circumstances. It's possible that the seal that holds the window to the wall has failed, leaving a visible space through which air infiltration is possible. Alternatively, the window sill itself may have degraded or malfunctioned, jeopardizing the structural integrity of the wooden window frame itself. This not only increases vulnerability to moisture penetration but also jeopardizes the structural stability of the wall above the window, potentially leading to damp-related concerns and collapse if left neglected. You may not be able to detect the scenario. The intrusion of wetness may occur gradually, especially if your window fails during the summer. Instead, you may become aware of issues like drafts, noise disruptions, heat dissipation, and other everyday annoyances. These indicators provide trustworthy signs indicating the need for a complete check of your windows. Black mould appearing near the window frames  

How to Stop Damp and Mould Around Windows?

Use Some Enhanced Cooking Practices with Pan Lids

Use pan covers while cooking to reduce the amount of moisture released into the air, especially while boiling water. Use an extractor hood to further decrease moisture. Leaving the extractor fan on for a further 10-15 minutes after cooking helps to remove leftover humidity, especially with sophisticated humidity sensors.

Do Regular Maintenance of Bathroom Doors and Closed Kitchen

Close the kitchen and bathroom doors when boiling, cooking, or showering to avoid condensation forming on the windows. This method prevents moisture created in these locations from seeping into more relaxed spaces, where it might cause condensation. Condensation issue with a window

Optimize Clothes Drying

When possible, dry garments outside to prevent extra moisture accumulation. If outside drying is not feasible, leave damp items in a closed bathroom with windows open until completely dry.

Activate Extractor Fan during Showers

To quickly rid steam and moisture when bathing, switch on the extractor fan, just like you would in the kitchen. This procedure is essential in low-temperature conditions since it efficiently reduces bathroom condensation. Condensation on windows in a house

Use Proper Ventilation While Using Washing Machines

To avoid extra moisture from being emitted into the air, ensure that washing machines have proper ventilation. Proper venting is essential in kitchens where cooking causes moisture.

Maintain Furniture Clearance from Walls

Position furniture at least 50mm away from external walls to improve ventilation and reduce damp and mould growth. Place wardrobes against interior walls to limit the probability of cold surfaces generating moisture difficulties. Damp and mould attacking the walls and windows

Use Adequate Ventilation Solutions

Install energy-efficient extractor fans in the kitchen and bathroom to enhance humidity and prevent condensation. Alternatively, consider whole-house ventilation systems, which provide a complete solution.

Capitalize on Warmer Weather with Open Windows

Crack open windows in frequently used rooms during moderate weather to increase airflow. This eliminates breathing-related condensation and promotes a well-ventilated living environment.

Wipe Down Cold Surfaces for Moisture Control

In the absence of an extractor fan, wipe off cool surfaces after cooking or bathing to remove any accumulated moisture. This prophylactic method prevents mould growth on surfaces.

Ensure Adequate Heating and Energy Efficiency

Maintain adequate warmth to raise interior surface temperatures and reduce condensation concerns. Insulation, double-glazed windows, and draft-proofing can help prevent heat loss. Fungus and mould near windows in a house

Eliminate Moisture from Portable Heaters

Remove the usage of portable gas and paraffin heaters to reduce excess moisture and hazardous emissions. Comply with safety standards and tenancy agreements.

Invest in Insulation for Windows and Walls

Install double glazing, loft insulation, and draft-proofing to reduce heat loss. These techniques raise interior surface temperatures, lowering condensation risk and increasing energy efficiency.

Manage Moisture from Pets and Plants

Cover aquariums and fish tanks to keep excess moisture out. If wetness develops around home plants, try moving them outside. Maintain a moisture-conscious atmosphere to promote general health.  

What About Black Mould Around Windows?

Black mould, like many fungi, thrives in settings with high humidity and moisture levels. It begins as a delicate, virtually transparent presence and gradually matures into a thicker, darker shape as it stretches its reach. Excess moisture is the primary promoter of mould growth, particularly near windows and wet corners. This moisture comes from both internal and external sources, and ordinary activities like bathing, cooking, and even respiration contribute to increased indoor humidity. Externally, the entry of moisture is impacted by weather conditions, such as heavy rainfall and high humidity, creating an excellent environment for mould growth.

Black Mould Might Occur Due to Poor Ventilation

Inadequate ventilation in residential rooms restricts wet air, which promotes condensation, especially on colder surfaces like windows. Black mould is commonly seen on window sills that act as horizontal shelves, gathering moisture, especially when left uncleaned or exposed to open windows during damp weather conditions. The horizontal placement of window sills, along with precipitation or moisture, provides an ideal breeding environment for mould. Furthermore, certain materials used in the building of window sills contribute organic matter, making them more susceptible to mould growth.

Also, the Aging of Windows Might Cause Mould to Appear

Windows that are old or improperly placed may have diminished efficiency in insulating against external moisture and avoiding condensation. In contrast, adequately installed A+ double or triple-glazed windows are substantially more resistant to mould development. It's worth noting that some materials, including uPVC and other synthetic choices, have intrinsic mould-repelling characteristics. Mould susceptibility rises when there are broken sealants, fractures, or holes in the window construction, which allow for increased moisture infiltration. It is critical to handle black mould on uPVC window sealant as soon as possible to reduce the chance of it infiltrating surrounding structures. Paintwork getting peeled near windows due to damp  

Getting Rid of Mould Around Windows

Mould removal from windows may be accomplished quickly and effectively, especially when tackled early on. Cleaning and maintaining windows on a regular basis, with a focus on wooden frames, helps to prevent mould formation. While basic home cleansers may work for mild mould problems, there are several purpose-formulated mould-cleaning solutions available, some of which are specifically designed to tackle the renowned black mould. To ensure a thorough removal procedure, carefully follow the small steps outlined in the lengthy instructions for removing window mould, from your windows.

Clean with an Effective Cleaning Solution

Before beginning the work of removing black mould, wear safety gear such as rubber gloves and a face mask to protect against airborne spores generated during the cleaning procedure. While a mix of dishwashing solutions and warm water is relatively helpful in removing black mould, it is critical to realize that more potent options exist. The difficulty arises in the fact that if even a trace number of spores remains, the chance of mould recurrence is significant. Enter hydrogen peroxide, a multipurpose treatment. Combining one part, 3% hydrogen peroxide, and two parts water in a compact spray bottle or container aids in mould breakdown, making it suitable for a variety of surfaces without leaving harmful residues. White vinegar, another powerful and non-toxic alternative, provides versatility. Whether sprayed undiluted or diluted, the strength can be modified according to the degree of the mould infestation. Mould and mildew removers are specific compositions meant to fight these concerns. Also, adherence to the given rules is essential for the best outcomes.

Let Sit the Cleaner for Some Time

Apply the recommended cleaning solution freely to the mould-affected area. Allow at least 10 minutes for the solution to permeate cold surface and disintegrate the mould at a microscopic cellular level, or strictly follow the package directions.

Wipe the Surface

Once the cleanser has completed its absorption process into the mould, use a clean, soft cloth or sponge to remove the mould softly and systematically. Exercise caution since prolonged washing may result in the spread of mould spores into the surrounding air, potentially contaminating other sections of your home.

Dry the Area

Begin by methodically removing both mould and cleaning solution from the targeted surface, followed by thorough rinsing with a wet towel. It is critical to remove any remaining cleaning chemical residue since its presence may cause damage to the surface over time. Following the washing operation, use a separate dry towel to methodically and thoroughly dry the treated area, preventing any further mould growth.

Use Preventative Measures

To efficiently remove any remaining airborne mould spores, use a vacuum cleaner equipped with a high-efficiency particulate air (HEPA) filter. Apply a specialist mould-resistant primer on the window frame to increase the level of protection. This primer acts as an effective sealer, making warm air inside the surface less conducive to mould growth and considerably reducing the possibility of its comeback.

Dispose the Remains

Ensure appropriate disposal of mouldy cleaning products by securely sealing them in a specified plastic containment vessel before discarding them, effectively reducing the possible dispersion and dissemination of mould spores into the environment. Widnows glass getting condensation on it  


In addressing the issue of damp around windows, it is crucial to recognize that damp can manifest in various areas of a dwelling, including walls, ceilings, skirtboards, floors, and windows. However, our focus here is specifically on damp surrounding windows. The origins of this damp are multifaceted; it could stem from pipe leakages near the windows or direct exposure to rainwater on the window frames. Identifying the root cause is imperative for adequate resolution, and conducting a thorough damp survey proves invaluable in this regard. Once the underlying factors are unveiled, a strategic approach can be adopted to mitigate the damp issue.  

Why do you keep getting damp around my windows?

If you consistently notice damp around your windows, it may be attributed to condensation. This occurs when warm, moist air inside your home comes into contact with colder window surfaces, leading to the formation of water droplets. To stop condensation and mitigate this issue, consider improving ventilation within your home by using exhaust fans or opening windows periodically.

How do you stop damp around windows in the winter?

Proper insulation is crucial to prevent damp around windows during winter. Ensure that your windows are adequately sealed in order to avoid drafts and minimize heat loss. Consider using weatherstripping or applying a transparent plastic film to create an additional barrier against the cold.

How do you stop moisture from coming through your windows?

To stop moisture from coming through your windows, focus on enhancing your home's overall moisture control. Ensure proper ventilation by using exhaust fans in areas prone to humidity, such as kitchens and bathrooms. Utilize dehumidifiers to maintain optimal indoor humidity levels. Installing moisture-resistant window treatments and using moisture-absorbing materials, such as silica gel packs, can also contribute to minimizing moisture issues around windows.

Table of Contents

Picture of Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


At Damp Surveyors Ltd, we stand out as your premier choice for damp survey services in the UK. Our commitment to excellence and customer satisfaction sets us apart. Here’s why you should choose us:

  • Exclusive 3 Free Quotes: We offer a one-of-a-kind optional service where you not only get our top-notch damp survey but also receive 3 free quotes from vetted local companies, giving you peace of mind by saving you thousands on getting the most competitive quotes, and also time researching and contacting other reputable companies.
  • Knowledge and Experience: We provide unmatched knowledge to every survey we conduct thanks to our team of seasoned professionals and years of industry experience. This guarantees accurate assessments and practical solutions.
  • Nationwide Coverage: Whether you’re in a bustling city or a rural area, our services extend across the UK, making us accessible wherever your property is located. Choose us for nationwide reliability and excellence.

Choose Damp Surveyors Ltd as your reliable partner for all-inclusive survey needs. Our top concerns are the health and safety of your property, and we are committed to providing outcomes you can trust.

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