How to replace the glass in a uPVC window?

It’s not too difficult to replace the glass in a uPVC window, so if you’re a confident DIYer you could have a go at this yourself. We’ll go through the main steps on how to replace the sealed unit in a uPVC double glazed window: Using a rubber mallet and a strong pallet knife, remove the beading around the window. You might think they’re part of the frame, but they’re actually separate on the inside of the frame and can be taken out by using pallet knife to prize them out. Start with one of the longest beads first and leave the top bead until last. Give the glass a little tap to loosen it if it doesn’t come out straight away, then the whole unit should slide out easily. Just make sure it falls towards you and not back out onto the ground below! Clear any debris that has found its way into the frame with a brush. Add spacers at the bottom of the frame – these could be pieces of plastic. Get your new sealed unit (make sure you measure the glass before you buy one so you know which size to get) and carefully take it out of the packaging. Look for the British Standard mark – that shows you the bottom of the glass. Lift the glass into the frame, starting with the bottom first, and make sure that it fits square in the frame before taking the spacers out. Use a little washing up liquid to spread along the beads to make it easier when you slide them back into the frame. If they simply push and clip back in, you can use something like a block of wood to help you push them in correctly. Put them back in reverse order to how you took them out. And there you go! If you’re feeling confident you can have a go at replacing the glass in your uPVC window yourself. But if you’ve got any worries, leave it to a window installer who will be able to do it in less than an hour.

Replacement Glass (Glazing) in London

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Replacement Glass (Glazing) in London

Are you trying to find Glaziers in London? Our network of glaziers can assist with your job. All of our Window Installer in London are inspected so you can see local customer reviews, when the business was established, reviews, approval and price permitting you to make the ideal decision on who to hire. Allow us take the inconvenience out of finding as much as 4 pros for your Glaziers project.

Glaziers reduced, shape as well as mount glass for a selection of factors including windows, showers and mirrors. It's a extremely specialist profession and shouldn't be attempted by an amateur.

Glaziers can be required for both residential as well as business glass installations and also whatever your glazing requires; you'll be able to find help from these certified tradesmen.

Why would I require a glazier?

Among one of the most prominent reasons for requiring a glazier would certainly be to replace a smashed window pane. Glaziers will have the ability to reduce and also form the pane quickly as well as successfully to boost your residence's safety and security and also reduce your mind.

We will provide up to four Glaziers pros in your area, who will offer quotes for the job you want done. You'll obtain a home visit from professionals in London who'll help you to pick the right Glaziers for your house prior to carrying out the installment. Enter your postcode to start browsing now.

Average Glaziers cost in London

The regular cost of Glaziers is £75. Costs alter based on the materials and the business picked. The upper price range can be as high as £86.25. The material costs are in most cases approximately £18.75

Average price per Glaziers job in 2026

Avg. price low	Avg. price low £57
Avg. price	Avg. price £75
Avg. price high	Avg. price high £87

£200

£150

£100

£50

£0

Prices based on actual Glaziers costs for London, as reported by local LeadsDoWork members.

Glaziers installation cost in London 2026

	Labour cost	£53
	Material cost	£19
	Waste removal	£4

Time frame: 1 day

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No. of estimated projects Estimates by cities and towns

Glaziers Projects in London in May 2026

262,017

Requests for quotations in London in May 2026

0

Requests for Glaziers quotations in London in May 2026. 0% change from April 2026.

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Requests for Glaziers quotations in London County in May 2026. 0% change from April 2026.

Source: Numbers calculated based on the search volumes in major search engines

Glaziers searches in cities and towns near London May 2026

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London is the capital city of England and it's still caught in the inspiration of the 2012 Olympic Games which brightened the city. The multimillion pound venture helped to produce a range of new jobs across the city and saw a number of housing developments especially in the Stratford region. London remains the most popular tourist city in Britain with attractions such as Buckingham Palace, Big Ben, Madame Tussauds and the Thames River. Homes are varied as well, going back to Tudor, Georgian and Victorians eras.

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02 Mar

Windows | Glazing

London - W3

Enquiry from: Nicky H

Start Date: Immediate

Customer is interested in getting 9 windows resealed. Call back anytime. Type of window / door: Windows Glass replacement only: No Number of windows requiring repair: 9 Number of doors requir...

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21 Feb

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London - NW3

Enquiry from: Adam G

Start Date: Immediate

Hello, have a smaller single pane (lower) sash window that's been broken. Frame fine. Can I please get pricing to replace?

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24 Nov

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what best describes your living situation? - -. how many windows are you considering replacing? - -. what material do you require, upvc? - -. what colour do you want them to be? - -. do you require do...

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31 Oct

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Enquiry from: Clifford S

Start Date: Immediate

call back anytime. type of window / door: windows glass replacement only: yes number of windows requiring repair: 13 number of doors requiring repair: 0 other repair required: no quote req...

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27 Oct

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are you the property owner: owner of the property property type: terrace what level of service do you require: repair/glass only do you require doors: none i am looking for quotes for 4+ windows how...

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10 Oct

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customer made an online enquiry for replacement windows via one of our websites. confirmed via . 2+ windows supply and install please call to arrange an appointment to quote. are you the property owne...

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30 Sep

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are you the property owner: owner of the property do you require doors: 375, 375 property type: semi detached what level of service do you require: repair/glass only i am looking for quotes for 1 win...

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12 Aug

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London - N1

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repair of broken glass make secure are you the property owner: owner of the property property type: commercial are you looking for glaziers: yes how many units do you do you require: 1 window what lev...

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Customer is interested in repairs to a sliding patio door. Call back anytime. Type of window / door: Doors Glass replacement only: No Number of windows requiring repair: 0 Number of doors requi...

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11 Jul

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London - E1

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Customer wants to replace the glass in two windows and one door. Call any time. Type of window / door: Windows and door Glass replacement only: Yes Number of windows requiring repair: 2 Number...

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06 Jul

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London - E17

Enquiry from: Riffat A

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are you the property owner: owner of the property what level of service do you require: repair/glass only how many windows do you need: 4+ windows do you require doors: 375, 375

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29 May

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London - E6

Enquiry from: Aati A

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03 Apr

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London - E17

Enquiry from: Gholam B

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Customer has 2 windows that cannot be locked. Call back anytime. Type of window / door: Windows Glass replacement only: No Number of windows requiring repair: 2 Number of doors requiring repair...

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24 Mar

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21 Feb

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07 Feb

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Call back anytime. Type of window / door: Door Glass replacement only: Yes Number of windows requiring repair: 0 Number of doors requiring repair: 1 Other repair required: no Quote requested ...

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04 Feb

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Customer is looking for secondary glazing for seven windows in his property. Call any time. Type of window / door: Window Glass replacement only: Yes Number of windows requiring repair: 7 Numb...

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20 Jan

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31 Oct

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FAQs

It’s not too difficult to replace the glass in a uPVC window, so if you’re a confident DIYer you could have a go at this yourself. We’ll go through the main steps on how to replace the sealed unit in a uPVC double glazed window:

Using a rubber mallet and a strong pallet knife, remove the beading around the window. You might think they’re part of the frame, but they’re actually separate on the inside of the frame and can be taken out by using pallet knife to prize them out. Start with one of the longest beads first and leave the top bead until last.
Give the glass a little tap to loosen it if it doesn’t come out straight away, then the whole unit should slide out easily. Just make sure it falls towards you and not back out onto the ground below!
Clear any debris that has found its way into the frame with a brush. Add spacers at the bottom of the frame – these could be pieces of plastic.
Get your new sealed unit (make sure you measure the glass before you buy one so you know which size to get) and carefully take it out of the packaging. Look for the British Standard mark – that shows you the bottom of the glass.
Lift the glass into the frame, starting with the bottom first, and make sure that it fits square in the frame before taking the spacers out.
Use a little washing up liquid to spread along the beads to make it easier when you slide them back into the frame. If they simply push and clip back in, you can use something like a block of wood to help you push them in correctly. Put them back in reverse order to how you took them out.

And there you go! If you’re feeling confident you can have a go at replacing the glass in your uPVC window yourself. But if you’ve got any worries, leave it to a window installer who will be able to do it in less than an hour.

Whether you need toughened glass in your windows depends on where the windows are in your home or business. Toughened glass is sometimes referred to as tempered or safety glass, and it just means it’s stronger than the standard glass that’s usually offered with double glazed windows. So how do you know if you need it?

Toughened glass is useful in areas of your home where you might come into contact with the windows if you were to trip and fall. If you put your hands out to steady yourself on standard glass the chances are it would break into large sharp pieces with jagged edges. Of course, this means that you could seriously cut yourself if this were to happen. With toughened glass, the structure of the glass is changed so that if it breaks it shatters into lots of tiny pieces, minimising the risk to you if you were to fall on it.

You might want to use toughened glass in patio doors, low windows or frames next to doors. It just means that you will be safer if the unlikely happens and you or a family member falls through the glass. There are certain requirements through Building Regulations with windows at a certain level, but any reputable window installer should be able to go through these with you if you need to replace your windows with toughened glass. The regulations will only apply to new windows – there's no need to switch your windows to toughened glass early, but when you do come to replace them you’ll need to make sure they meet the standard.

Yes, the glass in a double glazed window can be replaced. The glass in a window, or sealed unit to use its proper name, is not permanently attached to your window frames so if it gets damaged but your frames are still intact, there’s no need to replace the whole window. The glass in your double glazed window might need to be replaced due to:

Impact from a stone or other object smashing the glass in a ‘bullseye’ effect
The result of a break-in
Extreme weather or changes in pressure causing a crack
The sealed unit being ‘blown’, meaning that it’s no longer energy efficient due to air leaking out

A lot of window installers will replace the glass in your double glazing for you, but you might need to get quotes from specialist glaziers too. Glaziers deal purely with the glass in windows rather than installing entire frames. It won’t take a professional very long to replace the glass in your window. They will remove the beading from around the window with a pallet knife or chisel, leaving the top one until last to keep the sealed unit stable. Then, they simply lift out the glass carefully and will discuss with you whether the removal of the old sealed unit is included in their quote. Next, they will brush away any dust and debris that’s made its way into the frame and place spacers at the bottom. They will then lift the new glass into the frame, making sure it’s completely square. When they’re happy, they’ll remove the spacers and replace the beading back in reverse order. You’ll notice the replacement glass in your new window straight away as draughts should be eliminated and you’ll be able to see clearly again!

If the glass in your window has been damaged, you might only need to replace that rather than your whole window frame. Common reasons for needing to replace the glass in your window include:

The glass has smashed from an impact such as a stone hitting it from a lawnmower
You have been broken into and suspects used the window to gain entry
The glass has blown (lost its airtightness) from constant water build-up around the seals, which is common in bathrooms
Extreme weather or pressure changes have caused a crack

If your frames are still intact and there’s nothing wrong with your window’s locks or trims, there’s no reason why you can’t just replace the sealed unit in your window. To help with the quotation process, a window installer may ask you to measure the glass for your window replacement. It’s pretty simple to just measure the sealed unit inside your window. There are just 3 steps you need to take:

Including the beading (the plastic and rubber seals around the windows that can be removed), measure the width of the window frame.
Do the same for the height of the window, making sure you include the beading.
Then, take 10mm off each measurement, and you have the approximate size of your glass.

A reputable window installer will still make their own measurements before confirming the size of the glass in your window and going ahead and ordering the replacement. Make sure you get a range of quotes from local and national installers so you can compare the price and their quotation process.

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