COST GUIDES
Window seal replacement cost UK: 2026 prices
Updated 06/26
Window seals need to be replaced every so often in order to keep your house warm and dry. If yours need redoing, find out how much to budget for replacing your window seals.
Fast Facts
On average, window seal replacements costs in the region of £125 - £180
The more windows and the larger they are the most you’ll pay for replacement window seals
For accurate quotes, speak to checked tradespeople who cover your area
Read on to learn more about the cost of window seal replacement in the UK and how much you need to budget for window resealing.
How much does window seal replacement cost in 2026?
| Window seal costs | Cost + VAT (Range low - high) | Average cost |
|---|---|---|
| Window seal replacement cost (materials) | £5 - £10 | £7.50 |
| Window seal replacement cost (labour). Cost per window after 2. | £20 - £70 | £45 |
| Window seal replacement cost (labour). Minimum call out | £100 | |
| Replacing blown window pane cost (materials) | £25 - £95 | £60 |
| Replacing blown window pane cost (labour) | £30 - £50 | £40 |
| Total window seal replacement cost (materials and labour) | £125 - £180 | £153 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
The average window seal replacement cost in the UK is around £125 - £180. However, the total cost will depend on the scope and complexity of the job.
The total cost of uPVC window rubber seal replacement will be a combination of the material costs and labour — including any call-out fee.
Window sealing services are typically priced based on time, materials, and accessibility.
How much does window gasket replacement cost?
Gaskets - the black rubber strips of sealant you find on the rims of double glazed windows - are fairly cheap and easy to replace.
The average cost of sealants like gaskets is as little as £7.50.
You can even save money on your gasket replacement by doing it yourself if you have the skills. But it's usually best to get a professional repair service to handle it, as it can be tricky work - you risk damaging your windows if it's done wrong.
If you're not confident re-sealing your windows, your best bet is to hire a window repair service to tackle it for you to a high quality standard. Enter your postcode to search our directory to get started.
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How much does it cost to replace a blown window?
The average cost to replace a blown window in the UK is £100. The exact price of replacing a blown or misted window will vary depending on the size of the window, the project complexity, and your location.
Blown window repair fees can vary depending on where you live, so it’s a good idea to speak to window repair companies covering your local area for the most accurate cost estimate.
Bear in mind a blown window requires a different repair - it's not as simple as just replacing the sealant. See our full cost guide for more details.
Blown window repair: Cost breakdown 2026
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.
How much does it cost to reseal double glazed windows in the UK?
The average cost of resealing double glazed windows in the UK varies between £125 - £180.
As with standard windows, the sealant on double glazed windows can also be replaced.
Window silicon is the most common product used when resealing double glazed units.
Window seal replacement cost: Job estimator tool
Use our job estimator tool below to help calculate how much window seal replacement could cost you. Just type out a few details about your windows, and let the calculator use Checkatrade data to give you a cost estimate.
Job Estimate Calculator
Factors affecting window seal replacement costs
Here are some of the main factors that will affect the price of replacing your window seals:
The number of window seals to replace – Resealing windows costs more with every extra seal around windows that needs replacing. Fixing double glazed doors will cost even more
Window size – A larger window will need more materials and labour for its seals to be replaced, increasing the cost
Window material - uPVC, timber, and aluminium window frames have different seal profiles, and costs can vary
Type of sealant used – The type of window glass sealant, whether silicone, latex, oil-based asphalt or butyl rubber, will affect the cost
Damage to the window – Replacing sealant won’t fix any damage to the window such as blown double glazing, cracked panes, or broken window frames, which may require full replacement
Ease of access – If it’s difficult to access your windows inside or outside, there may be additional costs due to extra labour time
Location – Costs can vary by region, with homeowners in London or the South East typically paying more than elsewhere in the UK
Do I need to reseal my windows?
uPVC window seal replacement plays a crucial role in keeping your home comfortable and energy efficient — but over time, they can wear out.
Common reasons to replace your window seals:
Prevent moisture from entering your home
Draught-proofing your home and improving insulation
Maintain energy efficiency and reduce heating bills
Avoid damage caused by ageing or cracked seals
Replacing worn seals is a relatively low-cost job that can quickly pay for itself through energy savings.
How to tell if window seals need replacing
Below are some of the most common signs that your window seals may need replacing:
Condensation on your windows
Mould appearing on the seals
The sealant containing gaps and cracks
Draughts coming from around your windows
If the current seals are old or beginning to degrade
If it’s been 5-10 years since you last had them replaced
Catching these signs early can help you avoid bigger problems and keep your home warm and dry.
Cost of professional window seal replacement vs DIY
While DIY window seal replacement can save you money on labour, it can be a tricky job.
Installing new uPVC seals requires precision to avoid air leaks, condensation, or damage to the window frame.
Resealing a window yourself can be a costly expense as you will need to source the materials and equipment yourself.
Wondering if you need energy efficient windows? Whatever your need, from double glazing repairs, to finding an installer, we've got you covered. Even if you can't choose between window types.
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For a job done right, use our free search tool to find a checked company covering your local area.
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Window seal replacement cost checklist
Window seals keep our homes energy-efficient and free from moisture
Condensation, mould, cracks and draughts are common signs of issues
As best practice sealant should be replaced every 5-10 years
Check frames for damage and other issues, like blown windows
Hiring a checked tradesperson ensures a great finish and protects against moisture
Remember to check and replace the inner black sealant strips in your uPVC windows as well as the silicone sealant
Ready to get started? Enter your postcode below to browse a list of checked window fitters covering your local area.
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Enter your postcode to find a top tradesperson near you
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Window seal replacement: Cost FAQs
Yes, it’s a good idea to get your windows resealed, especially if you are experiencing issues with your windows performance. Issues such as drafts, condensation or visible seal damage indicate that your windows may need to be resealed.
The benefits of getting your windows resealed include increased energy efficiency as well as reduced drafts and the prevention of moisture damage.
Resealing windows costs between £125 - £180 in the UK. If your window is damaged, is difficult to access, or has multiple panes, the cost to reseal it can go up.
On average in the UK it costs between £125 - £180 to reseal a window, including the call-out fee. The number of windows that need resealing will affect the final cost, as will the extent of the repair required and the size of the windows being resealed.
Generally speaking, resealing windows can effectively address and prevent issues with condensation. This is because resealing windows seals the gaps and leaks around the window frame, thus strengthening the barrier around the window and preventing moist air from contacting the interior window surface.
On average, window sealant typically lasts between 15 and 20 years in the UK. However, the exact lifetime of window sealant will vary based on environmental factors, local climate, the age and condition of the window itself and the type of sealant used.
It depends where you live and the condition and age of your property. Generally speaking, you should reseal your windows every 5 years in extreme cases. Speak to a checked window seal replacement company for an accurate estimate and evaluation.
It can take up to 2 hours to replace a window seal, depending on the window size and how easy it is to access.
Silicone is by far the most popular type of sealant and an excellent choice for this job. It rarely cracks, works great in extreme temperatures and is a tried and tested solution.
Butyl rubber, oil-based asphalt and latex are also options you could consider as alternates. To help you choose you should review this handy guide on choosing caulks and sealants.
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