Sash windows are a great choice for all types of modern windows. It can add natural light, control airflow, and is a stylish addition to any building. However, it’s possible for these types of windows to get scratched or damaged over time. For example, the glass may get broken during a hailstorm. When damage does occur, you should take action to repair the sash windows. Let’s look at some of the best ways you will be able to do this.

Fixing Broken Glass

One of the most serious problems that you might encounter with your windows is that the glass can get scratched or broken. Depending on the level of damage, this can represent a safety hazard. When this occurs, you need to take action as quickly as possible. When replacing glass, you might want to contact a modern sash windows repair company. Repairing glass can often be a difficult job. For example, you need to cut the glass into the right shape and size. Then, you need to insert it into the window.

Cracked Paint

Another common problem that people might notice is that their sash windows have cracked paint. This is most common in environments that have temperature extremes. As the paint expands and contracts, it will become more likely to develop cracks. This can reduce the amount of protection on the frame, making it easier for mould to get established. It can also look unsightly. Thankfully, this is an easy problem for you to solve.

First, you will need to remove the window from the wall. Once down, you will need to go over the area with sandpaper. This will remove the layer of old paint and stain. Then, you will be able to apply a new layer of paint, in the chosen colour. Make sure to finish with a layer of stain, adding extra protection. Finally, you need to re-hang the window. By doing this, you will be able to see instant improvements in the window’s appearance. Often, a new paint job can make the whole thing look years younger.

You might also want to check out: Two common sash window issues you can repair on your own

Adjusting the Springs

In some cases, you might notice that the window doesn’t open or close the way it used to. This could be because the spring mechanism needs to be adjusted. Thankfully, this is a fairly simple process, which you should be able to complete in a few minutes.

First, you need to open the windows around 4 to 6 inches. Once done, you will need to release the sash from the window jamb. The exact method to do this will vary, depending on the type of window that you installed. Often, the instruction manual will contain details on how you can do this. After it’s been removed, you will be able to see the springs that operate the window. You should also see the adjustment spring. This will allow you to adjust how much tension is placed on the spring. Using a flathead screwdriver, either loosen or increase the tension in the spring. To test the window, put the sash back on and open and close the window. If necessary, repeat this procedure several times until you’ve found a comfortable amount of tension.

Swollen or Rotting Frame

In some cases, you might notice the wood around the frame has become swollen or started to rot. This can be a serious issue, affecting the whole structure. This is more common in older homes, where there might be less protection from water damage. If you notice this, you should make sure to get in contact with a modern sash windows repair company. This will allow them to send someone to the property to inspect the problem. They will be able to look at the window and decide the best course of action. If caught early, you might only have to replace one part of the frame. However, in some cases, you might need to replace the whole window. You might also need to get someone in to look at the surrounding wall, to make sure that it hasn’t been damaged.

Worn Out Rubber Seal

You may also notice that the rubber seal on your windows has worn out. This can make the windows less effective at insulating your property. Thankfully, there are a few ways that you can replace the seal. First, you might want to check the warranty on the windows. In some cases, you might be entitled to have the window replaced. Alternatively, you might want to call in a modern sash windows repair company. They will be able to look at the damaged seal. This will give you a better understanding of how serious it is. In some cases, you might even be able to repair the seal yourself.


By maintaining your sash windows, you will be able to prevent some of these problems from occurring. You will also be able to keep the windows looking great while extending their lifespan. First, you might want to make sure that the glass is kept clean. This will help prevent scratches, as well as allowing you to see the outside world more clearly. You should create a cleaning solution by mixing together hot water and vinegar. Then, dampen a sponge and wash the windows gently.

After you’ve washed the windows, you will need to use a squeegee to remove any excess moisture. Then, rinse the windows with water and use a sponge to dry the window. You should also regularly inspect your windows. This will allow you to spot the first signs of rot, taking quick action. In addition, you might want to make sure to oil the windows. This will ensure that they operate smoothly.


Sash windows remain a very popular choice. They can add timeless beauty to your building while helping you lower your electricity bill. Hopefully, you now know some of the problems which you might encounter when you own this type of window. Perform some of these repairs today to keep your window looking great.

This article was written on behalf of Fix a Sash by Pieter Boyce. Pieter has an intense passion for English Architectural history and has been specialising in the conservation of original wooden windows and doors for decades. His exceptional knowledge of timber windows and doors, both listed or non-listed, is attributed to his hands-on approach to learning all aspects of the complete restoration of original features as well as having personally surveyed thousands of items throughout his long tenure as a head surveyor for one of the largest window and door restoration companies in the UK. He now runs a boutique wooden window and door consultancy and fervently champions the retention of original windows and doors. To learn more of Pieter’s services, visit his website at