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Published on October 8, 2018 11:06 AM

Sash windows are beautiful and practical. They contribute greatly to the overall atmosphere in the typical English home which is a good enough reason to never go out of style. If you have such windows at your property you already know what we are talking about. There are instances, however, in which you have to replace your sash windows because they are too old, decrepit and do not provide enough insulation for your house or apartment. Replacing sash windows can be tricky but have no fear. We are here to help you.

If you prefer to delegate the task to a valid, trustworthy contractor, Colin’s Sash Windows is your go-to firm for quality sash windows in the UK. In case you are a fan of the DIY approach when it comes to household improvements, you might want to take a look at the guide we have taken the time to compile here.
sash windows replacement

Step one – take the measurements

The most important initial step to take when you are about to replace your sash windows is to correctly take the measurements of the frames. Use a tape measure to take down the height of the window jamb on the left and right sides, as well as at its the centre. Then measure the bottom, middle and top width of the jamb. Both the diagonal measures and the depth are also important. Remember to always measure the entire jamb, not just the distance between the stops.

Step two – take down the old sash windows

Once you have the information about the measures of your sash windows, you can move on to removing the old windows from the walls of your property. First, you need to prepare your workspace – clear off all unnecessary items, and cover the floor, so that you do not damage it while you are working. Then, follow the few simple steps that are necessary for the successful removal of any sash window:
sash windows toolkit

Step three – install the new windows

To finish the job, you will need to fit the new windows. Get your sash window installation kit opened and screw the liner clips you find inside into the jamb. Place them evenly, some 4 inches from the top and from the bottom of each side. Now you can easily snap the new sash liners into place thanks to the clips. Lift the sash lifts some 25 cm above the sill and secure them in place. Once you have done that you can move on to installing the new upper sash. It should go bottom-first into the jamb, so you should tilt it accordingly. Push it very carefully until it snaps into the liners. Take your time, otherwise, you may end up damaging the sash even before you have installed it properly. Slide it down so that it can go into the sash lifts.

Energy EfficiencyUnreliable ventilation
Curb-appealDecrease in energy efficiency due to poor maintenance and age
Easy to cleanHard to repair

You have to repeat more or less the same process to install the second sash. Again, be careful not to scratch the material. Use 4d finish nails to place the new interior stops and voila – you are ready!

Alternatively, you can use the so-called Sash Windows Inserts. You need to make sure that the inserts fit perfectly your windows. If there are any cracks or empty spaces, you will have to measure the width and length again and order new ones. You will also need to purchase polyurethane caulk to apply along the inside of the blind stops. Place the jamb following the instructions that come with the inserts and install the screws halfway in the already existing holes. Now check if the windows are perfectly level and drive the screws all the way in. On the finishing line, you will need 4d finish nails to apply the original interior stops. In any case, read the instruction manual for the inserts carefully – it should be all explained in there in detail.

Colin Greenslade
Written by Colin Greenslade
I'm the founder of Colin's Sash Windows. I disrupted the sash windows market in the UK in 2014 by introducing fixed prices for uPVC sash windows in the UK. Before this they were generally only available at very high prices through window installers. Today our business is one of the market leaders in supply only windows, doors and roofs in the UK.

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