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Last updated on February 28th, 2024

How much does blown window repair cost?

A common problem for double glazed windows (or doors) is mist or condensation between the panes of glass. This is known as a blown window or failed double glazing. But what does it cost to repair?

Fast Facts

  • You can expect the blown window repair cost for a single pane to be around £55 to £145 per pane
  • For a whole window, replacement blown double glazing costs are in the region of £150 to £600 per window
  • The total blown window repair cost you pay will depend on the extent of the problem and the size of your windows

We understand that niggling feeling when you see condensation in a double-glazed window. If you have that problem, keep reading to find out more about the average blown window repair cost in the UK.

The work to repair blown windows is fairly standard, but it’s best to deal with it sooner rather than later. That way you can keep your home’s double glazing in optimal condition.

In this guide, we’ve put together some of the average prices for the so-called ‘cloudy to clear windows costs’.

How much does blown window repair cost?

The exact cost of replacing blown windows will depend on various factors, including whether you’re replacing a single pane or the whole window.

Replacing a single pane will cost somewhere around £55 to £145 per pane.

If you’re looking to replace the whole window it will be more expensive, with the average costs ranging from £100 for a small window up to around £850 for a large bay window.

cost of replacing blown windows

How much does it cost to replace one pane of double glazing?

If your double glazing is misted in a single pane of glass, the work is relatively affordable.

When it comes to misted double glazing repair cost, here’s what you can expect to pay for a single pane in the UK:

Single pane misted window repair costs

Single pane repair costs
Window pane sizeAverage 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)

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.

For larger blown windows you’re looking at a cost of about £117 to replace a pane of 800mm x 1,000mm.

And if it’s a 900mm x 1,200mm pane of glass, the cost to replace blown windows will be around £145 per pane.

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How much to replace blown double glazing for a whole window?

As you might expect, the blown window repair cost for a whole window is higher than repairing a single pane.

The main factor that will affect how much it costs to replace blown double glazing is the size of your window…

Whole misted window repair costs

Whole window repair costs
Size of windowAverage cost

Replacing a small blown window will cost around £100 to £200.

If it’s a standard size window the average cost is about £200 to £325.

To repair a large blown window you’re looking at a price tag of £350 to £850.

If you’re looking to replace all of the double glazing in your home, check out our double glazing cost guide.

Additional double glazing condensation repair costs

There are several extra costs that you might want to budget for when dealing with blown double glazing in your home.

Additional costs
ItemAverage cost
New window frame£600
Finishing trims£16
New window handle£15
Removal of blown window£275

A new window frame can cost anywhere from £250 to £1,500 each.

Finishing trims for the window will cost £6 to £26 per m².

The sealant is about £5 per 100ml.

New window handles cost in the region of £5 to £20 per handle.

And don’t forget the cost of removing the blown window, which could cost £140 to £400 per window.

Some (or all) of these double glazing condensation repair costs might be included in quotes you get from local double glazing specialists. But it’s always good to check.

Ask for a detailed list of everything that’s included in their quotes. If it’s not on the list, ask them about additional costs to avoid any surprises.

How much does it cost to fix a window in the UK?

Apart from the costs we’ve looked at in this guide, it’s not only double glazing blown repair costs that you might be dealing with.

You may have other needs to fix your windows. If so, here are some useful cost guides that we’ve put together that could be helpful:

cost to replace blown double glazed window

Factors affecting the cost of replacing blown windows

The cost to replace a blown double-glazed window will depend on a variety of factors, including:

  • Size and style of window
  • Extent of damage
  • Type of double glazing
  • Any prep work needed
  • Where you live

For detailed quotes and accurate prices for blown window repair, get in touch with local double glazing specialists.

We recommend getting three quotes to compare.

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What causes blown windows?

A blown window happens when a gap appears between the panes of glass. It allows moisture to get in – leading to misting of the glass.

The gap could come from damaged sealant or damage to one of the panes of glass itself.

Common causes of blown windows

Here are some of the most popular reasons why you have a blown window:

  • 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

Whatever the cause, you need to get the window repaired as soon as possible. Failed double glazing will no longer be as energy-efficient for insulation as it was before.

A blown window can also be a sign that the glass has weakened, which could pose a security risk for your home.

How to fix a blown window yourself

The reality is that fixing blown double glazing is not a DIY job. It requires specialist knowledge and tools to carry out the work safely and efficiently.

That’s why we always recommend hiring a local double glazing expert. An experienced tradesperson will know exactly how to fix a blown window.

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How to fix blown double glazing

Here’s a summary of what an expert will do when it comes to how to fix blown double glazing:

  1. An initial inspection to identify the extent of the blown windows
  2. Removal of either single panes or whole windows, depending on the amount of blown double glazing
  3. Installation of new window replacements
  4. Final checks to ensure that the new double glazing is fitted and sealed properly

Double glazing installation by Checkatrade approved tradespeople

Find the best double glazing experts near you

Fortunately, you’re in the ideal place to find the bed double glazing specialists in your area.

All our members have to pass up to 12 rigorous checks to be on our site – so you can be confident that you’re hiring a skilled person for the job.

Enter your postcode in the box below to browse approved tradespeople near you.


Can you fix blown windows?

Yes, you can. And, thankfully, it’s a fairly common job for double glazing experts. Due to the technical nature of replacing blown double glazing, it’s not a job to try yourself.

Is blown double glazing covered by insurance?

This will depend on the exact insurance policy you have. Some home insurance policies will include double glazing repair sometimes as an add-on that you pay an additional charge for.

It’s best to check with your insurance provider to see the details of your policy coverage.

Useful checklist for blown window repair cost

  • Inspect all your windows to check how many are blown
  • Speak to your local window repair specialists for their professional advice, and ask if they’ll offer a free inspection to check your windows
  • Shop around for fair and competitive quotes, and make sure you ask for a detailed list of what’s included in the price
  • Always hire a tradesperson with relevant experience and ask to see examples of their previous work
  • Choose tradespeople with excellent customer reviews and who are prepared to guarantee the quality of their work
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We check the reviews on Checkatrade are from real people, and that trades meet our high standards.

Working with professional estimators, we collate cost estimates for the common home improvement and repair jobs in the UK.

All the costs are estimates only. For accurate costs for your particular requirements, you are encouraged to reach out to professional tradespeople to receive a quote for your job.

Our estimators are Chartered Members (MRICS) of the Royal Institution of Chartered Surveyors and Members of the Chartered Institute of Building (MCIOB). See full disclaimer.

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Hi Claire, thank you for your comment. I recommend filling in our request a quote form with information about your job. We will then send it to three window fitters near you. I hope this helps.

Claire lacey

I have just bid on a fourth floor flat in a purpose built block, with the intention of buying it. I wonder if you might consider conducting a full review of the windows as each panes seems to have blown and is full of condensation. Happy to send photos if required. I am looking at m moving into the property around July 2022 and the windows will be my first job to complete. Hope you ca help!! Many thanks Happy to discuss on the phone to arrange quotation fee. Many thanks Claire

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