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myWindow Glass Replacement Cost
At a Glance
- The average cost of replacing blown windows is around £70.
- Double glazing glass replacement typically takes an hour to finish.
- A breakdown of how much misted window repair costs for different-sized units.
- An overview of what the job entails and expert advice from tradespeople on MyJobQuote.
- How to find and hire a local window specialist.
Struggling with misted or blown double glazing? Need to know how much window glass replacement costs in 2025?
Repairing a blown double glazed window is a common and affordable job that window fitters deal with. The average window glass replacement cost is between £55 and £195. The exact price you're quoted will mainly depend on the size of the window.
This guide includes everything you need to know about window glass replacement prices in the UK. From repairing uPVC windows and fixing misted panes to replacing blown double glazing, this guide has you covered.
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£70
Table of Contents
How Much to Replace Double Glazing Glass?
Let's get started...
Replacing blown double glazed windows can often seem like an expense you could well do without.
However...
If the problem is simply misted up or cloudy double glazing, then you don't have to replace the entire window, just the double glazed unit itself.
If you want brand new double glazing for all your windows, then read our new double glazing cost guide.
Can you repair a blown window yourself?
You can do this yourself as a DIY project. But if you do, you'll have to be very precise with the measuring. Most people will simply get a local joiner or window fitter to do the job.
Would you rather a professional do it? How do you find one?
A great way to find a reliable local window fitter is through recommendations from friends, family or neighbours.
But if this is not possible, then we provide a free and easy-to-use service on MyJobQuote. You can simply enter brief details about the job, then you can have up to 3 local tradespeople get in touch with you to provide written quotations.
How much does it cost to replace blown double-glazed units in a typical two-bedroom terraced house?
"It depends on the size of the unit, but a normal sized window costs about £50."
Window Glass Replacement Prices
In the table below, you'll find an overview of how much misted window repair costs for different-sized double glazed windows.
| Window Size | Material Cost | Labour Cost | Total Cost |
|---|---|---|---|
| 200mm x 400mm unit | £25 | £30 | £55 |
| 500mm x 700mm unit | £34 | £40 | £74 |
| 800mm x 1000mm unit | £72 | £45 | £117 |
| 900mm x 1200mm unit | £95 | £50 | £145 |
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How Long Does Window Glass Replacement Take?
The table below provides an estimate for how long it typically takes a specialist to make double glazing repairs like this.
In short? It should not take an experienced tradesperson more than about an hour to correctly replace the glass in a double glazed window.
| Window Size | Estimated Duration |
|---|---|
| 200mm x 400mm unit | 30 mins |
| 500mm x 700mm unit | 40 mins |
| 800mm x 1000mm unit | 45 mins |
| 900mm x 1200mm unit | 50 mins |
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Things to Consider with Blown Double Glazed Units
How do glazed windows become blown?
The main reason why double glazed units become misty is that the seal between the two panes of glass has failed.
How long do you expect double glazing to last before problems occur?
5 years or less
4 votes - 17%17% of votes
6 – 10 years
4 votes - 17%17% of votes
11 – 15 years
5 votes - 22%22% of votes
16 – 20 years
5 votes - 22%22% of votes
More than 20 years
5 votes - 22%22% of votes
23 votes
See results
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What's the process of repairing it?
If this happens, then you do not need to replace the entire window including the frame.
You can, in fact, simply replace the double glazed unit itself. Alternatively, there are specialist companies that can repair the double glazed units by removing any moisture and resealing the window.
My mum’s bungalow has four double glazed windows with condensation between the panes. Is there a way to remove the condensation, or do the windows need to be replaced?
"The glass units have blown. It’s only a small job to replace the glass — there’s no need to replace the entire window. Replacing four units should take around an hour.
Is replacing a glazed unit complicated?
Replacing a double glazed unit is fairly straightforward and in fact, any local handyman or DIY enthusiast should be able to do it.
However, the difficult part and the part which can often lead to expensive mistakes is the initial measuring of the window before placing an order with a manufacturer.
Any mistakes in these initial measurements can result in a brand-new double glazed unit which simply will not fit properly into the existing window frame.
Can You Replace Window Glass in Double Glazing Yourself?
Removing blown double glazed units and replacing a double glazed window is normally quite straightforward. However, some modern double glazed windows are fitted with special anti-theft blocks which can complicate things.
The double glazed units themselves can be held in place using pressure gaskets or double sided tape — but in either case, can be removed relatively easily.
Before ordering the replacement double glazed unit you will not only have to be very precise with the measurements, you will also need to know the thickness of the glass panes, whether the glass is toughened, and the type of glass for example is the glass tinted or standard.
With the right skills and tools, DIY replacement of a double glazed unit is certainly possible.
The top pane in my window is blown but the lower one looks fine. Do I need to replace the whole lot?
"No you don't need to replace the lot, just the one that has blown.
Only the glass will need to be replaced. It's worth taking a look at your other windows just in case — but unless it's really noticeable, it's not necessary."
Only the glass will need to be replaced. It's worth taking a look at your other windows just in case — but unless it's really noticeable, it's not necessary."
But you also have to consider that this is not a terribly expensive job and if you get a professional in then the job won't take as long, or be as messy, and will be much less hassle and frustration, and you can avoid a potentially shoddy job being done and then having to hire a professional in anyway!
Blown Double Glazing Checklist
- Blown double glazing is much less energy-efficient so will cost you money
- With blown double glazing you do not have to replace the entire window
- Misted up double glazing units can also be repaired in some cases
- Replacing a double glazing unit is fairly straightforward
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FAQs
How much does it cost to replace a blown double glazed window?
Normally, this would simply involve replacing the double glazed unit itself rather than the entire window. So this, in most cases, will be a relatively cheap job, with the bulk of the costs actually being the labour.
How much does replacement sealed double glazing unit cost supply only?
You can buy double glazed units in standard sizes from as little as around £20.
How long should my windows last before they start misting up?
This really depends on the quality of the windows. Many customers report no problems with double glazing after 15 years or more. On the other hand, there are instances of blown double glazing happening within five years of installation.
What causes condensation between the panes of a double glazed window?
In most cases, this is caused by the seal around the window feeling and allowing moisture to get in between the panes. Although, there can be other reasons which mainly relate to any building work going on in the immediate vicinity of the window.
Is replacement the only option with blown double glazing?
No, you can also have double glazed windows repaired in some situations by specialist companies. However, this is not always possible and depends on the type of glass used in the window frame.
Sources
https://www.staywarmenergy.co.uk/blown-double-glazing/
https://www.mrmisty.co.uk/double-glazing-repairs-blog/658/mind-the-gap-why-replacing-a-misted-window-pane-saves-£££s
