Functional restoration

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Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

Functional restoration of timber sash windows

Have you realized that the casement window or timber box sash in your house is stuck or simply not opening? If yes then that is a clear indication that they need functional restoration. This means that virtually every aspect of your sash windows including spring balances, hinges, weights, stops, restrictions, sash window locks, sash window cords, and closing and opening mechanism needs to be checked.

What Exactly Does Functional Restoration Mean?

Functional restoration simply means any type of restoration on your windows that aims to improve their function. A good example of functional restoration is securing the closure of a hinged casement window or counterweights rebalancing in a sash window. In other words, functional restoration helps to improve your experience when operating the window as opposed to making the window look stylish.

However, in most cases, functional restoration is usually done alongside rotten timber repair and double glazing retrofitting to improve both the function and look of the window. At Sash Window Refurbish, we always ensure that all windows that we restore for our clients are both functional and well-protected.

However, it is important to note that we only offer functional restoration services when undertaking window frame restoration projects. As such, we don’t provide services for broken sash window cords.

However, it is important to note that we only offer functional restoration services when undertaking window frame restoration projects. As such, we don’t provide services for broken sash window cords.

Functional Window Restoration Services Include:

  • Broken sash cord replacement
  • Sash window weights rebalancing
  • Unblocking stuck or painted sash windows that have shut
  • Repair of sash window spring balance
  • Installation of sash window restrictors
  • Replacement of weights and pulleys
  • Elimination of excess rattles and play
  • Installation of sash window locks
  • Replacement of hinge in French door or casement windows


What exactly are Sash window restrictors?

A sash window restrictor is a device that prevents the window from opening. It has small bolts that sit on the frame on both sides of the window. Their main function is to prevent children from opening the window. That is why they are usually installed at a height where kids cannot access them. Sash window restrictors are also common in period hotels.

How do sash window restrictors function?

Now that you know what sash restrictors are, you may be wondering how they work. The way window restrictors work is simple. They have threaded inserts that are screwed into the window frame to protect the wood.

Sash window restrictors have a bar that protrudes outside which helps to prevent the window from opening. The window can only open when you remove the restrictor with the help of the key that it comes with. This is a great security feature especially if you have kids. This device will keep them safe by ensuring that they don’t open the window.

What are sash cords made of?

Sash cords are made of natural jute which is sometimes coated in wax to prevent it from rotting.

How does the sash cord work?

The sash cord is a crucial component that plays a very important role in a sash window. The main role of this device is to hold weights that balance your slides. It usually runs across the pulley wheel to maintain weight correctly. If your window has a sash cord, you will have an easy time opening it because of the counterbalance that it is equipped with.

How much does it cost to replace a sash cord?

The cost of replacing a sash cord varies depending on many factors such as the company that you use and your location. For instance, replacing sash cords in the UK is more expensive than in Romania. However, the average cost of replacing sash cords ranges anywhere between £180 and £250. But in some cases, the replacement cost may be higher, especially if something else needs to be fixed.

What is a sash cord screw pulley?

As its name suggests, a sash cord screw pulley is the device that helps to make the process of opening the window simple and stress-free. It is a part of the opening mechanism and the sash cord runs via it to aid in opening the window.

What is a sash cord with a core?

A sash cord with a core is a sash cord that has a higher breaking point because of its internal section and the highly resistant material that it is made of. The fact that it has a high breaking strain means that it is much more effective and long-lasting. A sash cord with a core is very similar to a normal sash cord and will not change the look or style of your window.

Why did my sash window cord snap?

The most likely reason why your sash window cord snapped is because of friction. As mentioned earlier, the sash cord moves every time you open or close the window. Frequent rubbing of window frame parts increases friction which causes the sash cord to eventually snap. To prevent this problem, it is advised that you install sash cords with a core because it is sturdier and thus less likely to break due to friction.

Cord or chain, which one lasts longer for a sash?

The answer is a chain. A chain is by far much stronger and will last for a longer period than a cord. However, it is recommended that you stick to what your sash window has. This means that if your window has a cord then you should stick to it and vice versa. Additionally, a well-installed and maintained sash cord can last for more than 60 years.

How can I open a painted-shut sash window?

Opening a shut sash window is simple. All you need to do is slide a putty knife to open the paint. You can also use the knife to open large areas of the paint. You just need to be gentle and it will open.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.