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How to stop a draught from uPVC windows

Draughts from UPVC windows are usually caused by one or two key issues. In most cases, the issue stems from the windows not closing correctly. So to diagnose the root of the problem and find out exactly what is causing the draught from your window there are a few things to look at. We will go through these below and help you diagnose the issue and then stop the draught!

Find what is causing the draught

Look for daylight

The first and easiest step is to look for any daylight coming in around the window frame. This will obviously show you if there are any gaps. While you may think that there is no chance you will have gaps in your window this does happen more often than you may think.

Over time the hinges on your UPVC window may sag causing the whole window to shift position. This can lead to gaps which will obviously cause a draught.

If this is a problem for you then first try to adjust the hinges to bring the window back in line. If this is not possible then look into replacing the hinges altogether.

Check the seals

Rubber deteriorates over time, so it goes without saying that your rubber window seals will not last forever. Degraded seals are a common cause of draught windows. This is a quick easy visual check to carry out, just have a look over all the seals to gauge the general condition of them. Are the cracked, broken in places?

If so then you need to do something about it. Replacing the seal entirely can be a very difficult job so we prefer to use anti draught tape and add this around all the seals.


Check the lock

One cause of draught coming through a UPVC window can be an old or damaged lock. If your window has locks then this is well worth checking to ensure it is not the cause of your issue. The first step is just to give the lock a quick inspection. Does it look rusty or misaligned? Then put the back of your hand in front of the lock and see if you can feel a draught on your hand.

If you think the draught may be coming from the window lock then it may be time to think about getting a new lock, or indeed windows fitted.

Check the frames

If your window frames are incorrectly fitted then this can cause draught issues. Check all the way around the frames visually and then with the back of your hand again to feel for a draught.

If there is one then you need to try and plug any gaps. If the gaps around your frames are large then expanding foam is a good choice for this and should have been done when the windows were originally fitted.

Secondary Glazing

Secondary glazing is where you add another window behind your existing window. This will definitely fix any draught but is quite a drastic step. To begin with, ensure you will be happy with this look as it is very atypical.

You will find this technique used on lots of older buildings where the original windows cannot be changed due to planning laws. I see it often in some of the older pubs around my area.

It will definitely fix any issues you are having with your windows but you need to be happy to stomach the cost and not be bothered about having two windows in one!

Insulated Curtains

A much cheaper and less intrusive way than either adding secondary glazing or getting new windows is to fit insulated curtains. These just look like normal curtains but are thermally insulated, helping to eliminate and draughts and improve the overall energy efficiency of your home.

The one major drawback to this option is that it obviously only works while the curtains are closed!


While you are looking for draughts have you thought about painting your uPVC windows and doors? Find out can you paint a uPVC front door