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The harsh winter in Britain almost always raises the same question for homeowners: why am I windows Suddenly water started dripping? As the temperature outside falls and the temperature inside rises, warm, humid indoor air meets the cooler window, and the result is condensation. Although a small amount of moisture is not unusual on a frosty morning, persistent condensation can be a nuisance, damaging the frame and increasing the risk of mildew.
This guide explains why condensation increases in the winter, the effects it has on your windows, and the most effective ways to clear and prevent it.
Do you have condensation on your windows? Might be time to get a replacement
If condensation continues to form on the inside of your windows, it may be a sign that your windows need to be replaced. You can use our comparison tool below to get a range of free quotes from leading UK Window Installer,
What is window condensation and why does it happen in winter?
Condensation forms when warm, moist air comes in contact with a cold surface. The moisture in the air condenses into liquid water, forming droplets on the inside of your windows.
Cold waves make the problem worse. Windows lose heat faster, indoor heating increases humidity levels, and most people keep their homes tightly closed to stay warm. Everyday activities, such as bathing, cooking, boiling the kettle, drying clothes indoors and even breathing, add several liters of moisture to the air.
When your windows are the coldest point in the room, that moisture has to freeze somewhere.
Is condensation bad for your windows?
A small amount of condensation in the morning is quite normal, especially in older homes or rooms with high humidity. But persistent moisture can cause problems:
- Wooden structures can absorb water, causing swelling, peeling paint and long-term decay
- Mold can grow on window frames, surrounding plaster, and behind curtains or blinds.
- Excessive humidity can create an uncomfortable, unhealthy indoor environment
There is also condensation which indicates a deeper problem: trapped moisture. between Double-glazed glass. This usually indicates a failed seal, meaning the insulating gas has escaped. In that case, the affected sealed unit will need to be replaced.
Types of condensation and what they tell you
Not all condensation is the same, and understanding the type you’re dealing with can help you pinpoint the cause and choose the right solution. Some variations are harmless and simply reflect how modern glazing works, while others may be a sign that part of your window system is failing. Here’s how to tell the difference.
condensation inside your windows
This is the most common type and is almost always caused by excess indoor humidity. This can usually be cured with better ventilation and small changes in lifestyle.
Condensation outside your windows
It is visible on modern, energy-efficient double or triple glazing during cool, clear mornings. This is a sign that the window is effectively retaining heat indoors, and it usually clears on its own.
condensation between glass
If you see mist inside the sealed unit, double glazing Probably failed. The only solution is to replace the affected unit, as the seal cannot be repaired.
Quick Solution: How to Get Rid of Condensation Fast
Before diving into the specific techniques, it helps to understand that the following quick solutions for window condensation are all about removing moisture that has already formed and preventing new moisture from forming on your windows. These steps won’t solve underlying moisture problems on their own, but they can make an immediate difference, especially during cold weather.
- wipe your windows every morning: Use a microfiber cloth or window vacuum to quickly remove moisture before it soaks into the frame.
- open the windows for a while: A few minutes of shock ventilation replaces moist indoor air with dry outdoor air.
- Use Extractor Fans Properly: Run bathroom and kitchen fans during and after bathing or cooking, ideally for 15-20 minutes.
- keep interior doors closed: This prevents humid air from expanding into cooler rooms where it will condense rapidly.
- Allow air to flow around furniture: Moving large furniture slightly away from exterior walls helps prevent cold spots where moisture can accumulate.
Long term solution to prevent condensation from returning
While quick solutions deal with the symptoms, long-term solutions deal with the root causes: excess humidity, cold surfaces and poor airflow. These changes are more effective at permanently preventing condensation and can significantly improve the comfort, indoor air quality and lifespan of your windows.
improve ventilation
Keeping the trickle vent open provides a continuous flow of fresh air without creating noticeable drafts, even in winter. Many homeowners close them to conserve heat, but this often traps humid air inside. Improving airflow may also mean opening windows for short periods of time throughout the day or considering a whole-house system such as positive input ventilation (PIV), which gently pushes fresh, filtered air into the property to reduce moisture build-up.
reduce indoor humidity
Reducing the amount of moisture produced inside your home is one of the most effective long-term strategies. Avoid drying clothes indoors where possible, or if necessary ensure the room is well ventilated. A dehumidifier It may also help to manage humidity levels, especially in bedrooms, kitchens and utility spaces where moisture builds up quickly. Keeping your home at a consistent temperature prevents cold surfaces from forming, giving less room for moisture to accumulate.
Upgrade your glazing
Older single-glazed windows are prone to condensation as the inner pane becomes too cold. A-rated double glazing keeps the internal pane warm, reducing condensation. If you already have double glazing, but fog appears between the panes, replacing the sealed unit is the most effective solution.
Improve insulation and air flow
Well-insulated homes maintain more stable temperatures, reducing cold surfaces where moisture can accumulate. But it’s important to combine insulation with adequate ventilation to prevent moisture from accumulating inside the home.
When condensation signals a bigger problem
If you notice black mold around window frames, damp spots on walls or a persistent musty smell, condensation may be part of a broader problem rather than a simple winter nuisance. While everyday condensation is caused by excessive indoor humidity, more serious problems can arise from structural defects that allow moisture to enter or become trapped in your home.
Prolonged moisture can be caused by leaking gutters, cracked render, poorly sealed window frames or damaged points that allow rainwater to enter exterior walls. Older properties with solid walls or inadequate ventilation are particularly vulnerable, as there are fewer ways for moisture to escape. In these cases, simply providing more air may not resolve the underlying problem.
It is also worth separating surface condensation from rising or penetrating moisture. Rising moisture typically appears as tide marks on interior walls, while ingressive moisture appears as distinct patches that become patchy after rain. If you are unsure, a qualified surveyor or damp specialist can assess the source of the problem and recommend the correct treatment.
Continued growth of mold, especially if it comes back after cleaning, is a sign that you may need professional advice. Mold can affect indoor air quality, and in severe cases, some structural elements may need to be repaired or replaced.