How Much Does a Window Sill Replacement Cost?

Window sills are a staple feature in all British homes. Not only do window sills protect the wall underneath the window, but they can also add a stylish feature that can add value to your property.

In this guide, we will take a look at the average cost of replacing a window sill in the UK. We will go over the overall costs of the job, the supply costs for a window sill replacement, the labour costs for this type of work, and any additional costs that may be required with this work.

Additionally, we will take a look at the timescales that you can expect for this type of work, the costs of removing a window sill, as well as some information on the different types of window sills.

window sil lreplacement

If your window sill has become rotten or damaged, this should be replaced as soon as possible. Thankfully, the process of replacing a windowsill is quite straightforward.

We would recommend hiring a professional to complete your window sill replacement. This is especially true if you have stone window sills or period windows, as these will require a specialist to complete the work properly.

The average window sill replacement cost in the UK is around £140-£220. This price includes the cost of materials and labour. The overall price you pay will depend on a range of factors, including the size and type of window sill being replaced and your location in the UK.

Those based in the London area can expect to pay more for the work than those based in the North or other parts of the UK.

Whether it’s an interior window sill replacement or an exterior window sill replacement, the price will depend mostly upon the size of the window sill, the materials used, and your location in the UK.

Window Sill Prices

Below is a table showing the average window sill replacement prices for various types of window sill:

Standard window sill replacement £140-£220
Severely rotted window sill and frame replacement £250-£500
Sash window sill replacement £120-£340
Bay window sill replacement £140-£250
Edwardian bay window stone sill replacement £3,000-£4,500
Concrete window sill replacement £100-£200
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What are the Supply Costs for a Window Sill Replacement?

If you are interested in replacing your window sill as a DIY project, then you may be wondering about the costs of the supplies only without the cost of labour for the project.

selaing window sill

The cost of supplies will depend mostly on the type of material used and the size of the window sill.

The table below shows the average prices for replacing an average-sized window sill based on various materials.

PVC window sill replacement £20-£80
Wooden timber window sill replacement £50-£120
Concrete window sill replacement £30-£100
Stone window sill replacement £800-£2,500

Most people will opt to replace their window sill with a new sill in the same material as the old one.

This is because most people will want their new window sill to match up with the other window sills in their home.

Plus, it’s also much easier to replace a window sill with a like-for-like window sill.

What are the Additional Costs of Replacing a Window Sill?

When it comes to replacing your window sills, there are several additional costs that you may need to budget for with this type of work.

Below is a list of the additional costs you may need to consider when getting your window sills replaced.

Double Glazing Windows Installation

When you get your window sills replaced, this might also be a great time for you to have the windows in your home replaced with new double glazed windows.

This can be quite a big job, but it will improve the aesthetic appearance of your home and can also increase the value of your home quite significantly. You will need to hire a professional to install double glazing windows.

The average cost of replacing all of the windows in your home with new double glazing windows is around £250-£900 per window.

Painting House Exterior

If you are replacing the window sills on the outside of your home, you may also want to improve the exterior appearance of your home by painting it.

The overall cost for painting the exterior of your home will depend on several things, such as the size of your home, the type of paint that you choose and your location within the UK.

For example, the cost of render painting is usually around £700-£1,300, and the cost of simply painting your house on the outside is around £600-£2,000.

For more information check out our guide on exterior house painting.

Painting and Decorating

If you are replacing the interior window sills in your home, you may wish to consider painting and decorating some of the rooms in your house to improve their appearance.

The average price for painting a room is usually around £180-£600. If you would prefer to add wallpaper to your walls, this will usually cost around £180-£600.

Tradesmen Costs for Window Sill Replacement

If you have already purchased the materials or if you would prefer to source the materials yourself, you may be curious about the cost of hiring a contractor alone without the expense of the materials.

tradesman costs

The price you pay for a contractor to come and replace your window sills will depend mostly upon your location in the UK. For a typical window sill replacement, you can expect to pay a contractor around £40-£55 in total for the job.

If the job is more complex or if it requires work with heavy materials such as concrete, the work may take longer, and so the labour costs will increase according to the additional time needed for the work.

If you are based in London, you can expect to pay around 10-25% more for the cost of labour than those based in the North or other parts of the UK. This is true for any type of work that you have done on your home in this area.

If you are replacing stone windows, you will need to hire a stonemason to complete the work for you. This will cost much more than a typical replacement. A stonemason will typically charge around £150-£300 per day for their work.

How Long Does It Take to Replace a Window Sill?

When you need to get your window sill replaced, you may also be curious about the length of time this work will take. The timescales will vary depending on the type of window sill that is being replaced and the number of window sills that need to be replaced.

On average, you can expect it to take around 1-2 hours to complete just one window sill replacement. If the window sill is made from very heavy materials such as stone, the timescales may increase as these sills can be much more difficult to install.

If you want to replace all of the window sills in your home, this will usually take around 1-3 days, depending on the size of your home, the number of window sills to be replaced, and the materials being used.

Types of Window Sills

When it comes to replacing window sills, most people will choose to replace their current window sill with the same type, since that will most likely match up with the other window sills in the home.

However, if you’re interested in replacing multiple or all of the window sills in the home, you may be interested in choosing a different material for the sills.

Below, we will take a look at the different materials that you can choose for a window sill and the pros and cons of each type.

Wooden Window Sills

If you prefer the appearance of traditional windows, you will most probably like a wood window sill replacement.

wooden windowsill

Modern wood window sills have long-lasting waterproof layers that help to protect them from moisture. However, these are best to be used on internal window sills rather than on the outside of the home.


  • Traditional appearance
  • Waterproof layers for long-lasting protection
  • Great for internal windows


  • Not a great option for external windows

Tile Window Sills

In some older houses and cottages, you may find tile window sills. These types of window sills are stylish and most commonly found in kitchens and bathrooms.

One of the main benefits of tile window sills is that you can choose from a range of tiles, and you have the freedom to choose various colours and designs to suit your needs and to help increase the aesthetic appearance of the room.


  • Great for bathrooms and kitchens
  • Choice of various colours and designs
  • Very stylish
  • Very protective and waterproof


  • It may not look great in other rooms of the home
  • Not really suitable for outdoor window sills

Stone Window Sills

Many older brick and stone buildings still have natural stone window sills. These are very durable and long-lasting. Plus, they nicely blend in well with the whole interior and exterior of the home.

stone windowsill

They also don’t require any special maintenance or repairs. The only issue with these window sills is that they tend to be very expensive in comparison to other window sill materials.


  • Very durable
  • Long-lasting material
  • They blend in well with the interior and exterior of the home
  • They don’t require any special maintenance or repairs


  • Very expensive option

Metal Window Sills

Aluminium is very affordable, so this is one of the reasons why metal window sills are very popular these days. They're durable and quite easy to install.

On the other hand, the drumming sound of raindrops on the window sill may become irritating. Some manufacturers include noise suppression tapes for these types of window sills. However, this is quite rare.


  • Very affordable option
  • Popular option
  • Great for exterior windows
  • Quite easy to install


  • Drumming sounds from raindrops may become irritating

Plastic Window Sills

Plastic window sills are great because they can come in various styles and colours. During the production process, PVC window sills can achieve a marble, natural stone, or wooden appearance, so you can easily find a window sill that suits the appearance of your home.

plastic window sills

At the same time, these window sills are very resistant to mould and scratches. Plus, they have waterproof protection, making them great for both internal and external windows.


  • Various styles and colours to choose from
  • Can imitate marble, natural stone, or wood
  • Resistant to mould
  • Resistant to scratches
  • Waterproof properties
  • Great for both internal and external windows
  • Easy to install


  • Can warp and discolour over time

How Much Does It Cost to Remove a Window Sill?

If you are not happy with the appearance of your window sills, you may be interested in the costs involved with removing a window sill.

If you are planning on removing a window sill, you may be able to do this yourself as a DIY project, which can help save you some money.

Most people would prefer to hire a professional to remove their window sills for them so that the work is completed correctly and the removal is completely clean.

Most contractors will also take care of the waste removal for you as part of the overall price for the removal.

The average cost to hire a contractor to remove your window sills is around £20-£30 per hour. The overall price will depend on the number of window sills that need to be removed.

On average, it takes around one hour to remove one window sill, so if you are planning on having all of the window sills in your home removed, you can see how the labour costs for this can add up.


Q: What is the best window sill material?

A: This will depend entirely on your aim. Natural stone is the best, most durable, and longest-lasting type of window sill.

However, this is also a very expensive option, so if you're planning on replacing all of the window sills in your home, the overall price for stone window sills can be extremely high.

If you are looking for cheap reliable window sills, the best option here would be to choose PVC window sills as these are waterproof, easy to install and maintain and come in a range of styles and colours.

Q: Can I install stone window sills myself?

A: If you have natural stone window sills in your home that need to be replaced, you will have a very costly job on your hands. You can't simply complete this as a DIY project. You will need to hire a stonemason to carry out the work for you, and this type of work doesn't come cheap.

Q: Can you repair a rotted window sill?

A: This will depend upon how extensive the rot is. If there is just a small patch of localised rot, you can usually fix this up with an epoxy repair kit. However, if more than 10% of the window sill is rotting, then you will have to replace the entire window sill.

Q: How do I know if my window sill needs to be repaired or replaced?

A: The first thing you will need to do is to check whether there are any signs of rot on the window sill.

This may indicate some damage that needs to be repaired or replaced. If you have water or damp problems inside your home, this can also be a sign of problems with your window sills.

Q: What is involved with a window sill repair?

A: There are several different methods of repairing a damaged window sill. The method used will depend on what the problem is. A skilled repair specialist will cut the rotten face of the wood back.

They will then carefully glue a new section of seasoned wood in its place. The corners of the window sill can be strengthened using angle brackets made from stainless steel.

If there is a problem with the joints of the window sills, these can simply be re-glued as needed.

Q: How long does it take to complete a window sill repair rather than a replacement?

A: The length of time that it takes to complete a window sill repair will depend on what the problem is with your window sill.

Plus, it will also depend on whether the window sill can be repaired where it is or whether it will need to be removed and repaired off-site.

If you just need some small repairs on the window sill, these repairs may take anywhere from 30 minutes up to one hour. The more extensive the damage is, the longer the repair job will take.


Author: Kim J

I have a bachelor's degree in Journalism, which I studied in both the UK and USA. I've been a freelance writer for over eight years and have experience working with many large brands. My experience in writing is over a wide range of different niches, and I've specifically worked in the DIY and trades section for nearly two years. My favourite thing about freelance writing is working wherever I want as I love travelling and discovering new places and cultures.