Condensation on windows is a problem. For many of us, it is an all too common one.

Do you wake up in the morning to find your bedroom windows dripping with water? The pools of water on the windowsills and black mould around the window frame are everyday annoyances but could soon lead to a more serious damp problem. 

Where is all this water coming from? Is it bad for my health? How do I get rid of condensation?

We aim to answer these questions in this guide.

Getting rid of condensation on windows is easier than you might think. We explain what causes condensation on windows and give you some options for getting rid of it.


Window condensation

Window condensation is a common issue in the UK. There are a number of causes of condensation on the inside of windows. First, we must look at what exactly condensation is and what causes it.   

condensation on bedroom window close up


What causes condensation on windows?

Condensation on windows occurs because water vapour in the air deposits itself on surfaces that are at lower temperatures.

When moist air comes into contact with the cold impermeable surface of your windows, it releases some of this moisture onto the glass as water droplets. This is condensation.

Moisture gets into the air in our homes through everyday activities like cooking, washing, showering and drying clothes. With modern insulation and double-glazing, this moist air has no way of escaping your property. 

Window condensation is usually a bigger issue in colder months. This is because the warm air in your home holds more moisture than cold air. The surface temperature of your windows is also much lower. Together this means more moisture is deposited onto cold surfaces like windows and exterior walls. At Permagard, we receive hundreds of calls from people wanting to know how to stop condensation on their windows in winter.


Stopping condensation on windows

To stop condensation on windows, you have several options. These range from small practical changes to reduce condensation that you can start doing right away to installing a vent or a whole house ventilation system. 

Practical Changes

Some basic things you can do to reduce the amount of moisture in your home include covering pans when cooking, taking quicker showers and avoiding drying your clothes indoors, particularly on radiators. If you have an extractor fan in the kitchen, you should always use it when cooking.

You can also increase ventilation by opening windows, in particular at opposite sides of the house to allow for cross ventilation.  

How to stop condensation on bedroom windows

Bedroom windows can be prone to condensation because this is the room that you will want to keep warm at night. You will also create additional moisture in the air from breathing. 

If you have condensation problems in your bathroom then read our guide to avoiding condensation and treating mould in your bathroom.


Ventilation Systems – Your Options

The best option for getting rid of condensation permanently is a ventilation system.

Below we briefly highlight the systems available to help get rid of condensation. You can read about how to effectively ventilate your house in much more detail in our how to guide.


Passive ventilation

Passive ventilation uses natural forces to encourage airflow through your property. These vents contain no moving parts, making them very affordable and easy to maintain. Our Permavent is just £16.50 excluding VAT. They are easy and quick to install yourself and will get to work right away in problem areas.

permanent passive vent

Heat recovery systems

Heat Recovery ventilation systems work by replacing the moist air in your home with filtered, fresh air from outside. They include a heat exchange unit. This unit captures the heat from the warm air in your home as it leaves and uses it to warm the incoming fresh air. This significantly reduces the amount of heat wasted and reduces your energy bills.

The Kair Heat Recovery Ventilation Unit recovers up to 86% of heat, making it a highly effective solution to condensation in a single problem room.


Positive input ventilation

Positive input ventilation or PIV systems work by continuously replacing the moist air in your home with fresh, filtered air from outside. They are installed in your loft and will provide whole house ventilation. Window condensation in your home should be eradicated. 

The Nuaire Drimaster Eco PIV system is a highly effective and energy efficient version that gets rid of condensation and improves air quality in your home.


Remember you can also get rid of any black mould using our mould wash. 


Permagard – 30 Years' Experience in Condensation Control

If you have any questions about the ventilation systems or how to get rid of condensation on windows give our team a call. We can advise you on the best methods for your situation. You can also browse our condensation control products. The NHS also has a page on preventing condensation and mould.