3 Possible Reasons Your uPVC Sash Window Isn’t Staying Up (and What To Do About It)

uPVC sash windows are a popular choice for homeowners.  Not only do they look wonderful, they’re also a great solution if you’re looking to replace your old timber sash windows for something more energy efficient, lower maintenance and sympathetic to the original design.


uPVC sliding sash window in white woodgrain

There are of course cases in which these windows fail.  When it comes to sash windows failing, it’s usually in one of two ways; either your sash window isn’t staying up or your sash window is stuck.  Both can be frustrating and inconvenient, but it doesn’t always mean the end of your window or an expensive replacement job.

In this blog post, we’re giving you step-by-step instructions on what to do when your sash window won’t stay up, including how to get a better idea of what the problem is and why it’s really important to get it fixed promptly.

Diagnosing the Problem

When your uPVC sash window won’t stay up, it’s important to try and identify the underlying cause before attempting any sash window repairs and will really help the window company you contact if you have as much information as possible to hand . 

Here are some common reasons why sash windows may fail to stay in the open position:

1. Faulty sash window balance mechanism.

 uPVC sash windows use a spring operated balance mechanism that works in tandem with the window sash to keep it in place. If the balance mechanism is faulty or broken, the window sash may not stay in the open position.

To check for this issue, the sash needs to be removed to inspect the balance mechanism for any signs of wear, damage, or misalignment.  Unless you have experience in this area, this is something best left to the professionals.

2. Worn or damaged window hardware.

 Just like with traditional sash windows, the window hardware – meaning the catches and stays – can wear out or become damaged over time.  If the hardware is worn or damaged, it will struggle to keep the window sash in place. 

This is an easy one to figure out as you’ll be able to see just by looking.  Inspect the hardware for any signs of wear, rust, or damage that may affect its functionality.

3. Imbalanced or misaligned sashes.

If the sashes are not properly aligned, it can cause the window to tilt and prevent it from staying up. You can check for imbalanced or misaligned sashes by visually inspecting the window frame and sashes for any noticeable gaps or misalignments.

Once you’ve diagnosed the issue, you’ve got an easier job of figuring out who you need to contact to repair or replace it.  

Top tip: Remember to consult your guarantee as it may cover the repair, depending on how long you’ve had the window for.  If you are unable to take this route for your repair, then seek out a double glazing repair company rather than a window company.

The Importance of Getting It Fixed

A uPVC sash window that won\’t stay open may seem like a minor inconvenience, but it can have significant implications for your home. Here are some reasons why it\’s essential to address this issue promptly:

1. A sash window that doesn’t stay up isn’t safe.

A window that won\’t stay open poses a safety risk, especially if you have young children or pets in your home. It can unexpectedly slam shut, causing a nasty injury or damage to anything on your window sill. 

Additionally, a window that won\’t stay up may not provide proper ventilation, which can affect indoor air quality and comfort, especially during hot summers.

2. A broken sash window affects its energy efficiency.

A poorly functioning window can compromise the energy efficiency of your home. A window that won\’t stay up may not seal properly when closed, allowing drafts and air leakage, which can result in increased energy bills and reduced comfort.

3. The sooner you repair your sash window, the longer it will last overall. 

Ignoring a window that won\’t stay up can cause further damage to the window components, potentially shortening the lifespan of the window. Fixing the issue promptly can prevent further wear and tear and extend the overall lifespan of the window.

uPVC sash windows are a popular and practical choice; they’re energy-efficient and a low-maintenance alternative to timber sash windows and you’ll be hard pushed to tell the difference between the two by looking at them.

However, like all windows, they can encounter problems over time.  When your sash window won\’t stay up, it\’s important to understand what the underlying issue is and see to it ASAP. 

Not only can a faulty window pose safety risks, but it can also compromise the energy efficiency of your home…and a window being propped up by whatever you’ve got lying around just isn’t a good look!

By following the step-by-step instructions provided in this blog post, you can identify the problem and determine the next steps to getting your uPVC sash window fixed.

Addressing the issue sooner rather than later can help you enjoy the benefits of your uPVC sash windows for many years to come.

We supply and install some beautiful Residence Collection sash windows  – get in touch for a quote if you’re local to Guildford, Surrey.

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