How to stop condensation on windows (and what causes it)
Condensation on windows is an inconvenience in colder months, but if left untreated it can lead to serious problems and shouldn’t be ignored.

Condensation on windows is the accumulation of water droplets or moisture on the interior or exterior surface of a window. This phenomenon occurs when warm, moist air comes into contact with a cooler surface, causing the water vapor to condense and form visible water droplets.
Condensation can be a nuisance, as it can lead to various problems if left unchecked.
How to Stop Condensation on Windows
Dealing with window condensation can be a frustrating issue, but there are several effective ways to address it. In this article, we’ll explore the causes of condensation, the potential damage it can cause, and provide practical solutions to help you stop condensation on your windows.
The only method to eliminate condensation from developing on windows and walls inside your house is to identify the true root of the issue. Finding the source of your home’s excessive moisture is the first step.
Continue reading and we’ll tell you about:
- What causes condensation
- Why condensation is bad for health
- How to stop condensation
What causes condensation on windows
Excess moisture in the air causes condensation to develop on chilly surfaces. when it’s cooler outside than inside, usually on windows.
Condensation on windows is typically caused by a combination of factors, including:
Excess Moisture: When there is too much moisture in the air, it can lead to condensation on windows. This can be due to activities like cooking, showering, or even just breathing.
Temperature Differences: When warm, moist air comes into contact with a cooler surface, like a window, the water vapor in the air condenses and forms water droplets.
Poor Ventilation: Inadequate airflow and ventilation can contribute to the buildup of moisture, leading to condensation on windows.
Single-Glazed Windows: Windows with a single pane of glass are more prone to condensation, as they have a lower insulation value compared to double-glazed windows.
- Condensation on a mirror after a shower
- A kitchen window steamed up when cooking
- Moisture on windows when drying clothes indoors
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How can condensation damage windows?
Water that sits on surfaces, even ones that are impervious, can ultimately cause damage to those surfaces. Consider mold and limescale accumulation.
Despite the fact that uPVC windows are waterproof, persistent expansion and contraction can cause overly damp seals to dry out and shatter when exposed to intense direct sunlight.

Mold and Mildew Growth: The presence of moisture can create an environment that is conducive to the growth of mold and mildew, which can be a health hazard.
Damage to Window Frames: Prolonged exposure to moisture can cause the window frames to deteriorate, leading to warping, rotting, or even structural damage.
The biggest causes of excess moisture that causes condensation
- Cooking, boiling pans and kettles
- Showers and hot taps
- Washing machines and tumble dryers
- Drying clothing on radiators or indoor airers
- Large houseplants
- Wet logs stored for wood burners
- Unfound water leaks in cavities or under floors
- Rising damp in basements and ground-level buildings

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Condensation and Black Mould
Condensation on windows can also contribute to the growth of black mold, which is a serious health concern. Black mold thrives in damp, humid environments and can release spores into the air,
which can be harmful if inhaled. Addressing condensation is crucial to preventing black mold from taking hold in your home.
How to Stop Condensation on Windows
There was a time when homes featured drafty windows, doors, chimneys, and air vents that let air circulate.
Over the past thirty years, homes have gotten much more energy-efficient, which has led to many of them being sealed units that retain moisture within the building.
Now that we’ve explored the causes and potential consequences of window condensation, let’s dive into the solutions to help you stop this issue:
- Improving ventilation
- Reducing moisture
- Installing double or triple glazed windows
How to Improve Ventilation to Reduce Condensation
Improving the ventilation in your home is one of the most effective ways to reduce condensation on windows. This can be achieved by:
Ensuring adequate airflow in high-moisture areas, such as bathrooms and kitchens, by using exhaust fans or opening windows during and after use.
Installing or upgrading your home’s ventilation system, such as adding mechanical ventilation or improving the efficiency of your existing system.
Ensuring that vents and air ducts are not blocked or obstructed, allowing for proper airflow throughout the home.
Reducing Moisture to Reduce Condensation
Reducing the overall moisture levels in your home can also help to alleviate condensation on windows. Some strategies to achieve this include:
Using a dehumidifier to remove excess moisture from the air, especially in damp or humid areas.
Fixing any leaks or sources of water intrusion, such as plumbing issues or roof leaks.
Limiting activities that generate a lot of moisture, such as cooking, showering, and drying clothes indoors.
Improving insulation in your home to maintain a more consistent temperature and reduce the risk of condensation.
Install Double Glazing to Reduce Condensation
Upgrading to double-glazed windows can be a highly effective solution for reducing condensation. Double-glazed windows have two panes of glass with a sealed air gap in between, which provides better insulation and reduces the temperature difference between the indoor and outdoor surfaces of the glass.
By installing double-glazed windows, you can:
- Improve the overall insulation of your home, helping to maintain a more consistent indoor temperature.
- Reduce the risk of condensation forming on the interior surface of the windows.
- Enhance the energy efficiency of your home, potentially leading to lower heating and cooling costs.

Do Dehumidifiers Stop Condensation on Windows?
Dehumidifiers can be a valuable tool in the fight against window condensation. By removing excess moisture from the air, dehumidifiers can help to:
- Reduce the overall humidity levels in your home, making it less likely for condensation to form on windows.
- Prevent the growth of mold and mildew, which can be exacerbated by high humidity levels.
- Improve the comfort and air quality of your living spaces.
However, it’s important to note that dehumidifiers alone may not be a complete solution for window condensation, as other factors, such as ventilation and insulation, also play a role. For best results, consider using a dehumidifier in conjunction with other strategies to address the root causes of the problem.
Common Misconceptions About Condensation on Windows
There are several common misconceptions about condensation on windows that are worth addressing:
Condensation is a sign of poor-quality windows: While single-glazed windows are more prone to condensation, even high-quality double-glazed windows can experience some degree of condensation under certain conditions.
Condensation only occurs on the outside of windows: Condensation can form on both the interior and exterior surfaces of windows, depending on the temperature and humidity levels.
Condensation is a problem that can’t be solved: With the right strategies and solutions, it is possible to effectively reduce or even eliminate condensation on your windows.
Dehumidifiers are the only solution: While dehumidifiers can be helpful, they are not a standalone solution for window condensation and should be used in conjunction with other strategies, such as improved ventilation and insulation.
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