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myDouble Glazing Condensation Repair Cost
At a Glance
- The average cost of dealing with window condensation is around £500
- The job will take approximately 1 day to complete
- A complete pricing breakdown which includes what you need to consider, along with what such a task usually involves
- How long the job should approximately take and a general overview of what types of services can be performed
- How to find and hire a window specialist
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Got misted or blown double glazing? Condensation between the panes usually means the window seal has failed, a common issue that reduces energy efficiency and visibility.
The average double glazing repair cost in 2025 is around £500, depending on the size and type of unit.
You can use MyJobQuote to find window specialists near you and get free, no-obligation quotes.
Prefer to learn more first? This guide explains what causes condensation inside double glazing, when you can repair it, and how much replacement typically costs.
£500
Table of Contents
- How Much Does It Cost to Remove Condensation From Windows?
- Where Is the Condensation? (Inside, Outside, or Between the Glass)
- Double Glazing: Repair vs Replacement
- Additional Condensation Removal Costs
- Factors That Impact Double Glazing Repair Costs
- What Causes Condensation in Double Glazing
- Things to Consider With Double Glazed Units
- Doing it Yourself
- Double Glazing Repair Checklist
How Much Does It Cost to Remove Condensation From Windows?
Removing condensation from double glazed windows typically costs around £300 for materials and £200 in labour for an average three-bed semi-detached home.
When the seals on double glazed units fail, moisture can enter between the panes, creating misted or foggy windows. In the past, the only fix was to replace the entire unit, but today some specialists can repair and reseal blown windows without removing the frame. This modern method can be up to 50% cheaper than full replacement.
Resealing or replacing double glazing isn’t a DIY job, the units are made to precise measurements, and resealing requires specialist equipment.
If your windows have condensation inside the glass, it’s best to contact a local double glazing repair company. The easiest way to get quotes from reputable tradesmen in your area is to use the free "Post a Job" service on this website.
Hi, I’ve noticed a lot of condensation buildup on my internal windows. It looks as though some of the beading/strip where the glass panel meets the frame is worn. I have already sealed around the window frames but now think I may need advice on how to fix the issue on the panel?
"You could try and get a new bead for the window and get the window resealed but for condensation can also come from the heat in the house or you could get a more up to date glass that will stop it"
Where Is the Condensation? (Inside, Outside, or Between the Glass)
Before deciding whether your double glazing needs repair, it helps to understand where the condensation is forming, as this reveals what the real problem is.
Condensation on the Outside
If you notice moisture on the outside of your windows, don’t worry, this is normal. It tends to appear in the morning when the outer glass is colder than the air. In fact, this shows your double glazing is working efficiently, preventing indoor heat from escaping to warm the outer pane.
Condensation on the Inside
Condensation forming on the inside of the window means your home has high humidity. Everyday activities such as cooking, showering, or drying clothes indoors can release moisture into the air. This is a ventilation issue, not a fault with your double glazing. Try opening trickle vents, using extractor fans, or running a dehumidifier.
Condensation Between the Panes
Condensation between the panes is the one to watch out for. This happens when the seal around the glass fails, allowing moist air to enter the gap and causing the insulating gas to escape. The unit has effectively “blown”, losing its energy efficiency. Repair or replacement by a professional is required.
This cost guide focuses on the solution for condensation between the panes.
If your windows are misted up on the inside of the unit, the following sections break down all the costs to get them repaired or replaced.
Double Glazing: Repair vs Replacement
Deciding whether to repair or replace a window often comes down to the condition of the frame and the specific problem you're facing. A professional repair can solve many common issues for a fraction of the cost of a full replacement.
Blown & Misted Double Glazing Repair Costs
For a blown or misted window, a repair is almost always the most sensible and cost-effective option, as long as the window frame itself is in good condition.
The replacement of a single unit is a relatively simple process, which for a standard unit can be completed within the hour. In the event you are replacing all your windows, this is usually considered a whole days work.
| Job Description | Material Cost | Labour Cost |
|---|---|---|
| Replace double glazed unit (standard glass) | £80–£120 | £60–£100 |
| Replace double glazed unit (low-e or toughened glass) | £100–£150 | £60–£100 |
| Replace all double glazed units in 3-bed semi-detached house | £800–£1,500 | £600–£1,000 |
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A professional repair does not mean trying to "fix" the old, misted unit. It means replacing the entire sealed glass unit (known as an IGU) with a brand-new one. The new unit is measured and custom-ordered to fit your existing frame perfectly.
Choose repair if:
- The window frame (uPVC, wood, or aluminium) is structurally sound, free of cracks, warping, or rot.
- The only problem is the misting or cloudiness between the panes.
- You are happy with the style and operation of the window.
This approach is far cheaper and less disruptive than a full replacement, as it requires no structural work or re-decoration.
Full Window Replacement Costs
A full replacement involves removing the entire window frame and installing a brand-new unit. This is a more significant and expensive job, but it is the correct solution in certain situations.
The table below provides estimates for a complete replacement, but for a full picture see our new windows cost guide.
| Job Description | Material Cost | Labour Cost |
|---|---|---|
| Replace one uPVC casement window (full frame) | £250–£500 | £100–£150 |
| Replace one uPVC sash window (full frame) | £400–£500 | £100–£150 |
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Typically you'd choose a full replacement if your windows have issues beyond condensation or misting.
- Damaged Frames: If the frame itself is warped, cracked, or (in the case of timber) rotted, a simple repair won't solve the underlying problem.
- Major Physical Damage: Severe damage to the entire window from an impact or break-in often makes replacement the only viable option.
- Poor Energy Efficiency: If you are upgrading from old single-glazed or very old, inefficient double-glazed windows, a new, modern unit will provide significantly better thermal performance.
- Multiple Failures: If the window has a failed glass unit, broken hinges, or a faulty lock, the combined cost of multiple repairs may start to approach the cost of a new window, making replacement a better long-term investment.
Additional Condensation Removal Costs
If you are experiencing an issue with condensation, there may well be other costs to consider if you require additional work carried out at the same time as resolving the situation.
Mould Removal
Anywhere there's condensation, due to a build-up in moisture, there's also a risk of mould. Especially within the surrounding area of a blown window or along the adjoining wall and as such the area should be well-ventilated.
It is possible to treat small areas yourself with a shop-bought spray, however, for more serious cases then professional mould removal services are also available. On average, this can cost between £400 and £500 depending on the severity of the issue.
Window Repairs
If the root cause of the problem is down to more than just the glass or sealant, then you may need to look at having the complete window repaired (including replacement frames).
The most common and affordable frames are normally uPVC windows costing on average between £250 and £750 per window.
Triple Glazed Windows
Should you find yourself in the situation whereby you've decided to upgrade your current double-glazing, then it's potentially worth considering triple glazed windows instead.
On average the cost of installing triple glazing is around £4,400 although this can depend on the size of property and the number of windows that require replacing.
In some instances the overall saving may be minimal compared to double glazing, especially if you already have a well-insulated home. However, the initial cost also comes with additional benefits such as providing extra sound insulation if you live near a busy road or can help protect against the elements along an exposed coastlines.
Window Cleaners
Whichever decision you make on dealing with the removal of your condensation issue, you will no doubt wish to keep your windows maintained in the future. This will, of course, start with a regular window clean which may cost as little as £40 per session.
Window cleaner costs vary across the UK, with areas such as London and the South East reflective of the higher cost of living. How many windows require washing and the accesibility of your property may also impact the price.
Factors That Impact Double Glazing Repair Costs
While the above prices give you a good indication of how much you can expect pay for condensation removal, there are a number of other cost affecting factors which include:
- Size and style of window
- Number of windows affected
- Extent of the repairwork needed
- Type of glazing
- Location and accessibility
As you can imagine, for example, the more windows you have that need looking at the higher the cost - although having all your windows actioned at once will most likely work out more cost effective in the long run.
What Causes Condensation in Double Glazing
Condensation is caused by a build up of moisture when there is a gap between the glass and the frame, often the result of an issue with the sealant or if the double glazing itself is damaged or cracked.
This creates a build up of mist, which will eventually make the glass harder to see through, and is often referred to as a "blown window". Should this occur, it can also lead to a wider damp issue and should be treated with a degree of urgency.
There are several reasons why condensation and blown double glazing may occur:
- Poorly installed windows
- General wear and tear on the sealant
- Natural deterioration of the frame
- Accidental damage or misuse
- Incorrect use of harsh window cleaner
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Things to Consider With Double Glazed Units
If you are having an issue with condensation, it's worth considering the following points when deciding between repairing or replacing your double glazing:
- Double glazing is an investment – Installing new double glazed windows can increase energy efficiency, lower heating bills, and make your property more appealing to buyers.
- Condensation is a sign of damage – Mist appearing within the glass layers indicates the seal has broken, reducing insulation and leading to heat loss.
- Resealing is a cheaper alternative – If the frame is intact, resealing an existing window can save money, although this isn't possible for toughened glass, Velux windows, or certain wooden frames.
- When replacement is the only option – If the glass is cracked or the frame is damaged, warped, or deteriorating, resealing may not be feasible and a full replacement is required.
Doing it Yourself
Resealing double-glazed windows is not a feasible DIY project, as it requires previous experience and the use of specialist equipment.
You could potentially measure the windows yourself in order to cut out some of the labour costs when applying for a quote, however, the savings would be minimal.
Plus as any measurements have to be precise, the smallest of mistakes can result receiving double glazed windows that don't fit your existing frames.
If this happens, a refund won't be available and the only option would be to remeasure correctly and pay for the windows twice!
Although fitting new double glazed units isn't necessarily a difficult job, nor is it time-consuming, most homeowners will simply hire a local window fitter to action on their behalf to avoid any mistakes.
Double Glazing Repair Checklist
- Double glazed units can be resealed for half the price of a replacement
- Toughened glass double glazing cannot be resealed
- Misted up double glazed windows can greatly reduce the energy efficiency
- Replacement double glazed units are more expensive but more durable
FAQs
My double glazed unit has condensation inside the window can this be repaired?
In most cases yes, this can be repaired. As long as the double glazed unit is reasonably modern and not damaged.
My double glazed back door has misted up inside the panes, can this be resealed?
No, typically double glazed doors feature toughened glass which cannot be resealed as this requires drilling a small hole in the glass itself.
Which is best, replacement or reseal?
Replacement will typically offer a much more durable fix to any condensation problems. However, replacement is also much more expensive. So if you are selling the property then resealing the windows as a much more attractive option price wise. Whereas, if you intend to stay in the property replacing the double glazed units may well work out to be the cheaper option long-term.
I have condensation in between the glass panes of my double glazed window, does this mean the seal is broken?
In most cases yes, but not always. Sometimes you may get condensation inside a double glazed unit caused by temporary issues such as high humidity or high levels of surrounding moisture due to construction work. In addition, in older double glazed windows this condensation could mean you need to replace the entire window.
Do I have to fix misted up double glazed windows?
If the double glazed unit has failed and moisture has started to appear as condensation between the panes, this will greatly reduce the energy efficiency of the window and cause cool spots and drafts in the room much like a single glazed window.
