Why is there condensation on the outside of my windows?

If temperatures start to drop in the run-up to winter, you may have noticed that condensation is forming in your home.

From a misty bathroom mirror after a hot shower to water droplets on the inside of your bedroom window when you wake up in the morning, condensation inside increases.

It tends to occur during the Autumn and winter months when the outside air is colder, and it may indicate above average humidity or poor ventilation in your home.

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But while you’re probably more used to seeing condensation in your house or car, it can also build up on the outside of your windows.

So what causes fogged windows in the morning and is that bad? Here is everything you need to know.

Why is condensation forming on my windows?

Window condensation can occur both inside and outside.

Condensation forms when there is excessive moisture in the air, as a result of everyday activities such as cooking, showering, or even just breathing.

When an object – such as a window – is cooler than the surrounding air, water molecules floating in the air can group into a thin layer of visible water droplets on its surface.

Is condensation on the outside of my windows bad?

Smears or drips caused by condensation on the outside of your windows can be frustrating, but they’re not really bad.

If your windows are fogged from the outside it means that your double glazing is very energy efficient and your windows are effectively insulating your home and preventing the transmission of heat.

You can simply wipe the condensation off the outside of the windows if you want, but this is not necessary as it will go away during the day anyway.

Condensation inside is more of a problem, as persistent moisture creates ideal conditions for it to form Mold and mildew which can lead to health problems or expensive property damage.

Why is my double glazing fogging up?

If condensation forms between the two panes of glass in your windows, it indicates a major problem as your double glazing is no longer working as it should.

You will likely need to arrange a window repair or replacement if you notice this in your house.

Common reasons for this problem are chemical damage from poor installation or repeated use of solvents or oil-based cleaners that can damage the window sealant.


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