How Much Does Window Seal Replacement Cost in 2020? | Checkatrade
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Window seal replacement cost guide

Why replace your window seals?

It’s easy to forget about the important role window seals play in our homes. They help stop moisture from entering the property, prevent draughts and keep our houses energy efficient.

However, they don’t last forever. Temperature changes cause window seals to expand and contract, breaking them down over time. As such, it’s a good idea to inspect your seals regularly for any tears and to get them replaced every 5-10 years.

Window seal replacement costs are fairly low, especially if you only need one window replacing. In fact, the improvements in energy efficiency can help pay for the work by saving you money on your heating bills.

How much does window seal replacement cost?

Window seal costsCost + VAT
(Range low - high)
Average cost
Window seal replacement cost (materials)£5 - £10£7.50
Window seal replacement cost (labour)£20 - £70£45
Replacing blown windows cost (materials)£25 - £95£60
Replacing blown windows cost (labour)£30 - £50£40

There are two main costs to consider for window seal replacements; the materials and the labour. The cost of materials is relatively low, only costing between £5-£10 per window for good quality silicone sealant. In terms of labour, you can expect to pay around £20-£70 per window, taking into account the factors we’ve covered below.

The total window seal replacement cost is likely to be between £25 and £80.

Signs you need to replace your window seals

If in doubt as to whether you need to replace your window seals, you should look out for the following tell-tale signs:

  • 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.

Find a window sealant specialist

Resealing windows caulking costFactors affecting the window seal replacement cost

With many different shapes and sizes of windows, the cost to reseal windows will vary. If you want to calculate “reseal windows costs” then you should consider:

  • Number of window seals to replace: As you’d expect, resealing windows costs more with every extra window seal that needs replacing. The bigger the job, the bigger the cost.
  • Size of window: Likewise, a larger window will need more materials and labour for its seals to be replaced, increasing the cost.
  • Type of sealant used: Along with silicone sealant, other sealants are also available including latex, oil-based asphalt and butyl rubber. The type of sealant will also affect the cost.
  • Damage to the window: Replacing sealant won’t repair any damage that has been done to the window, such as blown or cracked windows. In this case, or if the window is old, you should consult our window glass replacement cost guide.
  • Ease of access: If it is difficult to access your windows, inside and outside, there may be additional costs due to extra labour time.
  • Location: As with most jobs that require tradespeople, costs can vary by location. If you live in London or the South East you will typically have to pay more than in other regions.

Resealing double glazed windows cost

As with standard windows, the sealant on double glazed windows can also be replaced. There are no extra considerations that affect the cost, so you’ll pay a similar amount to a window seal replacement cost. Resealing double glazed windows costs between £25-£80. However, you’ll want to get this fixed quickly unless you want blown windows.

Replacing a blown window

Not fixing sealant quickly on double glazed windows is a key cause of blown windows. If the sealant breaks then air can enter the vacuum or the inert gas that sits between the planes, causing them to fog up. Once this happens the glass will need to be replaced, or in extreme cases, the whole window will need replacing.

The cost of replacing a blown window is £100 on average for materials and labour. This will vary depending on the size of the window.

Resealing double glazed windows costCan I replace window sealant myself?

There are a few issues to consider when deciding if you can replace the sealant.  You must look at any damage done to the window frame and consider whether the cause of condensation or draughts is due to issues with sealant or other issues. If it’s due to window or frame damage, then you should hire a professional to investigate the root cause.

Hiring a professional can also ensure you get a high-quality finish with the right type of sealant. With this approach they can completely stop moisture from coming in. If the job is done badly this moisture can ruin your windows and damage your home.

Due to this, we would recommend hiring a professional. To find a local, reputable, tradesperson in your area and get reseal windows costs use our free search feature.


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 size of the window 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.

Useful window seal replacement 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 very 5-10 years.
  • Check frames for damage and other issues, like blown windows.
  • Hiring a professional ensures a great quality finish and protects against moisture.

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