How to Adjust UPVC Windows

Having trouble opening or closing your uPVC windows? Don’t worry—this common issue usually just means they need a quick adjustment! Our easy-to-follow guide explains why uPVC windows sometimes need adjusting and walks you through the simple steps you can take to get them back to working as normal again.

How to adjust uPVC windows

Adjusting your window hinges

1. Carefully unscrew the hinges along the uPVC frame and lift out the sash. 
2. Steadily and firmly replace the old hinges with new ones and screw them in nice and tightly.
3. Open and close the window a few times to check for any gaps and ensure the window functions smoothly.

Adjusting dropped uPVC sash windows

1. First, tentatively remove the glass from your uPVC window. You can use dedicated bead removal tools to do this.
2. Close the window and realign the sash so that it sits nice and tightly. 
3. Reinsert the glass into the frame this time filling in air gaps with plastic packers so that there is no movement.

How to adjust top hung uPVC windows​

1. Inspect the bottom of your sash to see if it fits in the frame – You can do this by opening and closing the window a few times and seeing if the sash slides smoothly into the window frame. If the sash rests 0.16cm above the window frame, the window height will need to be lowered.
2. Open the window completely – This gives you access to the small screws you will need to loosen to alter the height of the window. Adjusting your window can take between 15 and 20 minutes so doing it on a rain-free day is advised. 
3. Locate the 4 screws holding the uPVC casement to the left-hand side of the frame and loosen them – These 4 screws will be holding a metal strip to the window frame. You should loosen them with a screw in one full turn. It’s important to note that you SHOULD NOT loosen the screws holding the hinges to the frame.
4. Locate the screws holding the uPVC casement on the right-hand side of the frame and loosen them  – Loosen them with one full turn of your screwdriver, as you did on the left-hand side.
5. Press or lift the window sash to adjust the window’s height – If your window hasn’t been closing fully you should move the window down ever so slightly and if it has been sticking to the frame when closed you should move it slightly upwards. 
6. Tighten the screws on the left and right-hand sides once the window is at the right height – You should close the window a few times to make sure it shuts properly.

Adjusting the lock position to improve the seal of your window

1. Open your window and find the lock-adjustment head  – If your style of window opens outward rather than upwards you can move the lock on the sash forwards or backward. Adjusting the lock will help your window seal properly helping to prevent draughts.
2. Insert an Allen wrench into the lock head  – uPVC windows tend to use an Allen wrench when adjusting the lock head.
3. Turn the wrench clockwise or anticlockwise to move the lock head forward or backward – If your window hasn’t been locking properly you should move the Allen wrench anticlockwise to relieve pressure on the window. If you want to improve the seal of the window you should move it clockwise to add pressure to the window.  

How to adjust the opening of your window

1. Check that your window hinges are functioning properly – Your windows will either come with friction hinges (these allow controlled opening and closing of your windows) and egress hinges (these open your windows to a full 90 degrees and tend to be used for emergencies). 
2. Adjust your hinges – You can tighten or loosen the screws in your hinges to change how far your windows open. 
3. Test how far your windows open – You should check that your windows are adjusted how you like and aren’t catching when you close them.

Signs you need new uPVC windows

uPVC windows tend to be made with pretty strong and enduring materials. However, they won’t always last their full predicted lifespan of 35 years. 

The best metric for deciding whether or not it’s time for a new installation is to pay attention to the condition of the window frames. Is there evidence of rotting, warping, or general damage? 

You should also take a moment to assess the health of the glass. Have you noticed any condensation between the panes of glazing that don’t seem to disappear? If so, this is also a sign that you need new uPVC windows.

Refresh your windows with Framemaster 

Framemaster has over 25 years of experience building the finest bespoke conservatories, orangeries, garden studios, verandas, extensions, doors, and windows across the West Midlands. With customer needs and wishes leading the way, Framemaster tailors their expertise toward helping you realise your dream home. 

We use only the most robust materials and stay up to date with the latest technology to ensure your home is kept warm and safe without compromising on aesthetic appeal. Visit our brochures to have a glimpse at the magic we do within our home improvement projects, or contact us today to begin drafting the plans to upgrade your home. 

FAQs

How long do uPVC windows last?

UPVC windows tend to last between 10 and 35 years depending on how well they are fitted and maintained. However, on average they usually last around 20 years. The life span of a UPVC window can also depend on the following factors:

• The quality of the UPVC – Cheap UPVC windows can warp and discolour over time.
• How they’re fitted – If windows are fitted incorrectly they’re likely to become damaged quickly, leading to them needing to be replaced. 
• Whether the windows are maintained – Without proper maintenance the lifespan of a window can decrease dramatically.

How to stop draughts from uPVC windows​

• Check and seal your gaps – You should find any gaps in the window frame, and seal them using silicone designed for UPVC windows, install weather stripping around the window frames and consider replacing the window gasket if you notice a gap between the glass panes. 
• Insulate your window frames – You can apply self-adhesive tape around the edge of your window frames and install draught excluders along the bottom of the window to improve their insulation. 
• Upgrade your window glass – Upgrading your window glass to double or triple glazing can help prevent draughts in your home. 
• Keep on top of maintenance – Maintaining and replacing your window components such as seals, hinges and handles can optimise your windows and prevent draughts. 

What happens when a uPVC window drops?

When a uPVC window doesn’t close snugly against its frame seal, it’s not just a small inconvenience—it’s letting valuable heat escape your home, driving up energy bills and leaving rooms chilly when warmth is needed most. In the summer months, these gaps can become an entryway for insects and allow moisture to seep in, leading to condensation and even mould growth on nearby walls. Worst of all, if you’re forcing a misaligned window shut you’re only risking more wear and tear.

By regularly checking and adjusting uPVC windows you’re keeping them efficient, helping you avoid these issues and save money in the long run.