Blog>Cost Guides>Window seal replacement: Cost breakdown 2025
Last updated: 4 July 2025
Window seal replacement: Cost breakdown 2025
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.
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.
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
How much does window seal replacement cost in 2025?
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. Below are some of the estimated average costs to reseal windows in the UK:
| 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 |
| Last updated: May 2024 Our costs are ballpark averages - get a local tradesperson to quote now | ||
How much does it cost to reseal double glazed windows in the UK?
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.
The average cost of resealing double glazed windows in the UK varies between £125 - £180.
Window seal replacement cost: Job estimator tool
Use our job estimator tool below to help calculate how much window seal replacement could cost you.
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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
Window size – A larger window will need more materials and labour for its seals to be replaced, increasing the cost
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 or cracked panes, 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
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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
Stop draughts and improve 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 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 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 blown window repair companies covering your local area for the most accurate cost estimate.
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.
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Window seal replacement: Cost FAQs
Is it worth getting your windows resealed?
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.
How expensive is it to reseal windows?
The cost of resealing windows depends on a number of factors, including the size of the window that needs resealing, the type of sealant used, and the task complexity. If your window is damaged, or is difficult to access, the cost to reseal it can go up. If you need to reseal a window with multiple window panes, you will need to budget for this.
How much does it cost to reseal a window?
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.
Does resealing windows stop condensation?
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.
How long do seals last on windows?
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.
How often should you reseal windows?
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.
How long does it take to replace a window seal?
It can take up to 2 hours to replace a window seal, depending on the window size and how easy it is to access.
What are the most common types of sealant?
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.
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
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