Blog>Cost Guides>Window sill replacement cost in the UK
Last updated: 15 August 2024
Window sill replacement cost in the UK
If your window sills have become damaged or rotten, it's time to replace them. By the end of this guide, you'll have a rough cost estimate to replace you window sills.
Fast Facts
On average, you can expect the cost of replacing a window sill to be around £140 and £220
For a standard window sill replacement the cost is usually in the region of £40 to £55
The cost will be higher for more complex window sill replacement jobs
Window sills protect the wall beneath from the damaging effects of rain and condensation. So, if they're damaged you'll want to replace them as soon as you can.
But how much does it cost to replace a window sill in the UK? Let's find out...
What is the cost of a replacement window sill?
| Item (with labour) | Range - Low | Range - High | Average Cost |
|---|---|---|---|
| Standard window replacement sill | £140 | £220 | £180 |
| Severely rotted sill replacement with frame elements | £350 | ||
| Sash window sill replacement | £120 | £340 | £230 |
| Bay window sill per 1.2M | £185 | ||
| Edwardian bay window stone sill | £3,850 | ||
| Concrete window sill replacement (average sized) | £148 | ||
| Last updated: May 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |||
The average total window sill replacement cost in the UK is around £140 and £220.
That price typically includes the supply of all materials and the labour cost of removing your old sill and installing the new one.
For a standard window sill replacement, a handyman would typically charge around £40 to £55 for the job.
For prices of other jobs that a handyman will do, check out our guide to handyman prices.
Factors affecting window sill replacement costs
That price for replacing your window sill will depend on various factors, including:
The type and size of window sill being replaced
The material the sill is made from
If there's any structural damage to rectify
The complexity of the job (and how long it takes to complete)
Where you live
For example, the average price for replacing a standard timber or uPVC window sill is less than the average concrete window sill replacement cost.
It's also worth noting that tradespeople in London and the South East of England tend to charge more than in other parts of the country.
You can expect to pay more for complex sill replacement jobs. Those jobs need a skilled tradesperson to do the job properly and avoid the risk of further damage in the future.
How much does sash window sill repair cost?
If your sash window sill is only partly damaged, then you may be able to repair your existing still – rather than replacing the whole sill.
The average hourly rate for a tradesperson to repair a sash window sill is around £32.50 per hour.
The total cost will depend on how long it takes to remove, repair and refit the window sill.
To help you compare, the cost of replacing a sash window sill with a new one is around £120 to £340.
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Other window sill repair costs
Bay window sill repair costs
Repairing a rotten bay window sill will typically cost more than a standard window sill, and will require a highly skilled service – particularly if you have wooden period windows.
Costs will vary depending on the work required and material and age of the window.
If you have a period property you will need a quote from a specialist to gauge the best approach.
The restoration and repair project often requires a complete repair and rebuild of the bay window.
Concrete window sill replacement cost
The average concrete window sill replacement cost is around £148per window installed (charged by the linear foot).
For windows with concrete window sills, you'll need a tradesperson who has experience working with concrete.
It's also worth noting that you usually order concrete window sills as pre-cast lengths.
Serious window sill rot
On average, the material costs for that work are in the region of £350+.
If a window sill has suffered serious damage and been left for a long time, there could be serious consequences for the structure of the surrounding window frame and walls.
If this has happened you may need to replace the whole window frame and carry out repair work to the brickwork or walls underneath or surrounding the window.
Edwardian bay window stone window sill replacement cost
If you have an Edwardian bay window in your home that features a stone window sill that needs replacing, you're going to have a costly project on your hands.
You'll need a stonemason to carry out the work and that doesn't come cheap. Replacing an Edwardian stone window sill starts around £3,850.
Find the best local window sill experts near you
We always recommend hiring a professional to replace your window sill, especially if you have period windows or stone sills that require specialist skills.
Ready to start? Enter your postcode in the box below to browse a list of approved tradespeople in your area:
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FAQs
Can you repair a rotted window sill?
That depends on how extensive the rot is. If it's a small patch of localised rot then you can usually fix it up using an epoxy repair kit.
However, if more than 10% of the window sill is rotten then you should replace the whole sill.
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