Blog>Cost Guides>Blown window repair: Cost breakdown 2025
Last updated: 4 July 2025
Blown window repair: Cost breakdown 2025
Suffering from blown windows in your home? Getting them repaired can be a lot more straightforward than you might think. Here, we’ll explore how much blown window repair typically costs.
If you’ve noticed mist or condensation between the panes of your double glazed windows, it’s likely a blown window. This is a common issue that can affect both the appearance and energy efficiency of your home.
Fast Facts
Blown window repair costs start at around £55 for a single pane
If your whole window is affected, costs will be in the region of £150 to £600 per window
Prices will vary depending on the extent of the problem and the size of your windows
Blown window repair usually involves replacing the double glazed unit rather than the whole window
Read on to learn more about the price of repairing a blown window and the factors that influence the cost.
How much does blown window repair cost in 2025?
Blown window repair cost typically ranges from £55 to £600.
To help you plan your budget, below are some estimated average costs for blown window repair.
Single pane blown window repair cost
| Window pane size | Average cost |
|---|---|
| 200mm x 400mm | £55 |
| 500mm x 700mm | £74 |
| 800mm x 1000mm | £117 |
| 900mm x 1200mm | £145 |
| Remove existing window pane and dispose (per m2) | £45 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |
Depending on the extent of the damage, you may be able to replace just a single pane of glass – which generally costs somewhere around £55- £145 per pane.
Whole blown window repair cost
| Size of window | Range - Low | Range - High | Average cost |
|---|---|---|---|
| Small | £100 | £200 | £150 |
| Standard | £200 | £325 | £270 |
| Large | £350 | £850 | £600 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |||
If you need to replace the glazing for a whole window, costs range from £100 for a small window up to around £850 for a large bay window.
Blown window repair costs in the UK
The type of window will affect how much blow window repair costs. Below are some average costs per window type.
Misted window repair cost for a single pane
Replacing a single pane is the most cost-effective option – but it’s only possible if the damage isn’t far-reaching.
| Window pane size | Average cost |
|---|---|
| 200mm x 400mm | £55 |
| 500mm x 700mm | £74 |
| 800mm x 1000mm | £117 |
| 900mm x 1200mm | £145 |
| Remove existing window pane and dispose (per m2) | £45 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |
Replacing a 200mm x 400mm pane of glass costs around £55
For a 500mm x 700mm blown window pane, the cost is about £74
You’re looking at a cost of about £117 to replace a pane of 800mm x 1,000mm
For a 900mm x 1,200mm pane of glass, the cost will be around £145 per pane
Whole window blown double glazing repair cost
If your whole window is affected, your costs will be higher. The main factor that will impact how much you pay is the size of your window.
| Size of window | Range - Low | Range - High | Average cost |
|---|---|---|---|
| Small | £100 | £200 | £150 |
| Standard | £200 | £325 | £270 |
| Large | £350 | £850 | £600 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |||
Replacing the double glazed unit in a small blown window will cost around £100 to £200
If it’s a standard-sized window, costs range from around £200 to £325
To repair a large blown window you’re looking at a price tag of £350 to £850
Blown repair cost: Job estimator tool
Use our job estimator tool below to calculate the cost of blown window repair in your area.
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What does it mean if a window is blown?
A blown window occurs when a gap appears between the panes of your double (or triple) glazed windows – often due to damaged sealant or damage to one of the panes of glass itself.
This allows moisture to get into the window unit, which can then cause it to mist up or take on a cloudy appearance.
Not only can blown windows make it hard to see out, but they can also lead to damp, reduce your home’s energy efficiency and even let in more noise from outside.
What causes blown windows?
Some common causes of blown windows are:
Windows that were installed poorly
Damaged window seals due to wear and tear or accidental damage
Old windows that have deteriorated over time
Using harsh chemicals to clean windows
A blown window can also be a sign that the glass has weakened, which could pose a security risk for your home.
Factors affecting blown window repair costs
Here are some of the most common factors that can affect the price you pay for repairing blown windows:
Size and style of window – Larger windows and those with more panes, such as bay windows, typically cost more to repair
Extent of damage – If only a small area is affected, you may only need to replace a single pane but multiple panes or a damaged window frame will increase costs
Type of glazing – Different types of glazing, such as toughened, frosted, or self-cleaning, vary in price, with triple glazing costing more than double glazing
Additional work and materials – If additional prep work, structural repairs, or extra materials are needed, they will add to the overall repair cost
Accessibility – Poor access can often make the job more complex, increase labour time, and add to the total cost
Where you live – Labour costs can vary across the UK, with higher rates typically found in the south and cities like London
It’s important to consider all of these factors when budgeting for the job.
Hidden costs to watch out for
Occasionally, you’ll face additional costs when getting your blown window repaired. Below are some other costs you may need to factor into your budget:
| Item | Range - Low | Range - High | Average cost |
|---|---|---|---|
| New window frame | £250 | £1,500 | £600 |
| Finishing trims (per m²) | £6 | £26 | £16 |
| New window handle | £5 | £20 | £15 |
| Sealant (per 100 ml) | £1 | £6 | £5 |
| Removal of blown window | £140 | £400 | £275 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |||
If you’re looking to replace all of the double glazing in your home, check out our double glazing cost guide.
Or, if you need other work carried out to your windows, head over to our related guides:
Window frame repair costs
Window glass replacement costs
Window fitting costs
Get a quote from checked window service providers
Every project is unique. So, the best way to get an accurate blown window repair cost for your needs is to reach out to checked tradespeople and double glazing services cover covering your local area.
They’ll be able to assess your windows and advise you on the most suitable fix for the problem before providing a bespoke quote for your needs.
See the tradespeople we've checked and recommend for your job
Blown window repair vs full window replacement: which is better?
Most of the time, you won’t need to fully replace a blown window – you can just replace the double glazed unit, which will cost significantly less.
However, in some cases, it might be worth considering a full window replacement.
For instance…
Your window is structurally damaged
Your windows are old (over 15 years)
They’re difficult to open
You don’t like the way they look
Your window frames are soft
If your windows need replacing soon, it may be more cost-effective to replace them now rather than just repairing the blown unit.
How to prevent blown windows
Here are some of the steps you can take to prevent blown windows in your home:
Check the sealant and caulking regularly for gaps and cracks
Caulk around the edges and fill any cracks with silicone sealant (or get a professional to do it for you)
Keep your windows clean by washing them at least every six months
Avoid using harsh cleaning chemicals
If your windows aren’t installed properly, this can lead to gaps forming between the double glazing – and the last thing you want is for your new double glazing to blow!
Hence the importance of hiring a qualified, FENSA-registered expert for the job.
Find checked double glazing services near you
Ready to find a window repair company? Great! You’re in the perfect place.
We can help you find checked tradespeople and window repair services covering your local area.
Enter your postcode in the box below to browse approved tradespeople to contact through Checkatrade
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Blown window repair cost: FAQs
What are the signs of a blown window?
Signs of a blown window can include:
Internal condensation
Cloudy or misty windows
Heating bills that are higher-than-usual heating bills
Increased noise penetration in your home
Increased draughts in your home
How to tell if double glazing is blown?
Signs of blown double glazing, or a failed sealed unit, include:
Condensation between the panes
Draughts around the frame
Cloudy, misty or dull glass
Visible damage, chips, or water leakage
Windows that are stiff and hard to open
An unexpected increase in energy bills
Can you repair windows that are blown?
Yes! Fixing a blown window is usually straightforward and involves replacing the double-glazed unit.
Here are the steps involved:
An initial inspection to identify the extent of the blown windows
Removal of affected double glazed units
Installation of new double glazed units
Final checks to ensure that the new double glazing is fitted and sealed properly
Can you fix blown double glazing?
Yes, you can fix blown double glazed windows. The cost to repair blown double glazing varies between £55 for a small window and £600 for a whole large window.
How much does a blown window cost to repair UK?
On average it costs £55 - £600 to repair a blown window pane in the UK. The exact cost will depend on the window size, glazing type, and your location.
How much does it cost to repair blown double glazing?
Blown double glazing repair in the UK costs between £55 for a small window to £600 for a whole large window.
For an accurate cost estimate, you’ll also need to consider the size of the window, and the age and condition of the window frame. Regional repair rates can vary, so speak to a tradesperson covering your local area to see how much it costs near you.
Can I fix a blown window myself?
While it is technically possible to fix a blown window yourself, it’s not a good idea.
Fixing blown double glazing requires previous knowledge and certain tools for a job done right.
It’s’s a good idea to hire a checked tradesperson to repair a blown window. Do your homework and read reviews from real people to help you find a tradesperson committed to quality.
How long does it take to repair a blown window?
It shouldn’t usually take more than a few hours to replace a single blown double-glazed unit.
However, if you need to repair multiple blown windows, this could take longer.
Is blown double glazing covered by insurance?
Whether blown windows are covered by insurance will depend on your specific policy.
However, often, it will depend on the cause. Most insurance companies won’t pay out if the seal is broken and the glass is intact unless it specifically says so in your policy.
How do I prevent condensation inside double glazing?
To prevent condensation inside double glazing, you should check that your windows are sealed tightly and fill any cracks with silicone sealant.
It’s also helpful to keep your windows clean, but avoid using harsh cleaning chemicals as this can cause blown windows.
Should I repair or replace misted double glazing?
Some companies can repair misted double glazing by removing any moisture and resealing the window.
However, usually, the most effective and cost-efficient way to repair misted double glazing is to replace the double glazed unit (note that this doesn’t normally mean replacing your whole window!).
Can blown windows impact my energy bills?
Yes! Blown windows will impact your home’s energy efficiency, which will cause your energy bills to rise.
An unexpected increase in your energy bills can be one of the signs of a blown window.
Is it worth replacing blown double glazing?
Yes! Blown double glazing doesn’t just look bad. It can also cause problems in the home, from dampness to reduced energy efficiency and even increased noise penetration.
With that in mind, it’s important to replace blown double glazing as soon as you can.
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