What is the average cost to replace windows?

On average, a single double-glazed window can cost you between £400 and £600. However, it often depends on not only the specifications of the window, including size, materials and type, but also on the house itself. If you live in a London property then you can typically expect the average price for new windows to be 15-20% than if you lived in another city.

Window Costs

Window Costs UK | Window Cost Calculator

How much does it cost to replace a window in the UK?

Use our free window cost calculator to get an instant guide quote for your replacement windows’ double glazing prices.

Need a free, no obligation window quote? We also have a wide network of accredited double glazing installers in the UK. If you are looking for a more accurate cost for replacement windows, then we can help put you in touch with recommended window companies in your area.

window cost uk

What is the average cost to replace windows in the UK?

As mentioned above, the price of a double-glazed window can vary on a number of factors, including the specifications of your design.

One particular factor in the price of your window installation is where you live.

A London resident typically pays between 15-20% more for their window installation than homeowners elsewhere in the country. These window costs can even vary on the borough of London, depending on their desirability and their size.

In other areas around the UK, the price can also vary somewhat on your location. For more information on what you can expect to pay within the UK, please use our free window costs calculator.

window costs

How much does it cost to install new windows?

When looking into what kind of window you want installed onto your property, the price of your installation will be dependent on the size and overall design of your windows.

This also includes how many windows you want to have installed.

A single window can cost as little as £200 to install, while 10 windows can easily cost around £2,000.

Again, this heavily varies on the type of window you have chosen. Some styles will cost as much as £500+ for installation, so it is best to know what kind of windows you want installed.

How does property size affect window costs?

As the size of the window can often dictate its price, it is natural to assume that the size of your property may also affect the overall cost of the installation.

Property Number of Windows Price
Flat 4 £2,100
House 8 £4,300
House 10 £5,400
House 15 £8,000

However, it isn’t so much the size of the property that affects the price of your windows, it is more to do with how many windows in it that you want to replace.

If you are planning on getting all of your windows replaced, having a larger the house typically insinuates that you have more windows to replace than a smaller property would.

If your house has around 8 windows needing to be replaced, this can cost you around £4,500, while a house with 10 windows would cost more at around £5,450.

Typically, every window that you want to replace will gradually increase the price of your installation because of the added work and materials.

How much does it cost to double glaze windows?

Getting double glazing is highly recommended. Not only does it provide stronger protection against the elements, but also provides far better levels of insulation. This helps you to bring down your heating bills, especially during the winter months.

Window Designs

Typically, a brand-new double-glazed window costs between £200 and £500 to have installed. However, if you want to keep your old window but still want to benefit from double glazing, there is also an option to have a sheet of secondary glazing fitted over your old window for around £100 to £200 per window. These window costs will either rise or decrease depending on the installer that you choose and where you are in the UK.

Double glazing vs Triple glazing

When looking into what kind of windows to get, you may have been recommended  both double glazing and triple glazing as ‘the best choice for your windows.’

But what exactly is the difference?

Double Glazing is made with two layers of glass, separated by a vacuum sealed chamber. This adds thickness to the glass and toughens it against excessive force, as well as creating a more thermally secure seal.

double glazed window costs

Triple Glazing has three layers of glass and two separate vacuum chambers. This claims to improve the security and the thermal insulation of the window.

The real difference, however, is in the pricing. While a double-glazed window typically costs around £350, a triple-glazed window will typically cost around £100 to £200 more.

Depending on where you live in the UK, double glazing should be sufficient enough.

Cheap double glazing

In a perfect world money would be no object and you could get the biggest and best double glazed windows available on the market.

In reality, window costs often dictate what kind of double glazing you choose for your home.

So, what are your options if you are looking for a more affordable double-glazing solution for your property?

replacement window cost

Contrary to their high-end appearance, double glazing is actually very affordable and can easily fit within your budget. You don’t have to fork out hundreds more for a stylish window, as our casement windows are designed to perfectly suit any kind of property you have, be it more contemporary or traditional in design.

What is the average cost to replace windows in your home?

Replacing an old or damaged double glazing window isn’t any different than getting a new one installed, meaning that the cost won’t be affected or different.

Your brand-new double-glazed window will cost you around £200 to £500. Although, as mentioned above, this can easily increase or decrease depending on the size of the frames, materials and how many windows you want replacing.

What is the average cost to replace window in your home?

How much does window replacement cost?

When finding out the cost of a replacement window, you may be worried that the cost only includes the supply and installation of the new window; leaving you to clean up and find a way of disposing of your old window.

However, the window costs you receive through our window cost calculator includes:

– A technical survey of your property

– Number and size of your windows

– Full installation of the windows

– Additional equipment for installation

– Removal and disposal of the old windows

Our free window costs calculator will give you an excellent guide price for your replacement windows.

Double glazed window repair cost

While double glazing is very tough to break, sometimes accidents or break-ins do occur.

Because of this, a crack in the window can damage its structural integrity. It is best to get the damage fixed as fast as possible, to ensure that your house remains warm and safe against the elements and anyone trying to gain access to your property.

window repair

Window repair costs will vary depending on what type of damage has been done to the glass or the outer frame. The outer frame being damaged can mean that the window frame needs to be replaced.

Damaged glass however, can easily be removed from the frame to fit a new glass pane. This will be inevitably cheaper than replacing the whole window.

How much do different window styles cost?

Casement window styles are usually the lowest in cost. Tilt and turn windows and sash windows are usually at the higher end of the price scale.

You will have to consider any extra security features, glazing, colours and finishes. Labour costs will also increase of decrease depending on which style of window you choose.

what is the average cost to replace windows

Casement window costs

Casement windows are the most popular design for double glazed windows in the UK, and it isn’t difficult to see why.

Stylish and highly customisable to your property, you can choose to have them opened in many different ways, including sideways, upwards or even downwards. They suit both traditional and modern homes and come at a very affordable and competitive price.

Standard casement windows typically cost around £200 to £500, although this does vary depending on their size and how many windows you want replacing.

Window Size Price per Casement uPVC Window
50cm x 50cm £300 to £400
100cm x 100cm £400 to £430
120cm x 120cm £430 to £500

Casement Window Prices

Casement Window Size Colour Guide Price
500mm x 500mm White £150 – £175
500mm x 500mm Wood Grain £175 – £200
1000mm x 500mm White £175 – £200
1000mm x 500mm Wood Grain £200 – £250
1000mm x 1000mm White £200 – £250
1000mm x 1000mm Wood Grain £225 – £275
1200mm x 1200mm White £225 – £275
1200mm x 1200mm Wood Grain £250 – £300

uPVC Casement Window Prices (1 Opener)

Casement Window Size Colour Guide Price
500mm x 500mm White £250 – £300
500mm x 500mm Wood Grain £300 – £350
1000mm x 500mm White £275 – £325
1000mm x 500mm Wood Grain £325 – £375
1000mm x 1000mm White £300 – £350
1000mm x 1000mm Wood Grain £350 – £400
1200mm x 1200mm White £350 – £400
1200mm x 1200mm Wood Grain £400 – £450
French Casement Window Size Colour Guide Price
500mm x 500mm White £450 – £500
500mm x 500mm Wood Grain £575 – £625
1000mm x 500mm White £475 – £525
1000mm x 500mm Wood Grain £600 – £650
1000mm x 1000mm White £500 – £550
1000mm x 1000mm Wood Grain £625 – £675
1200mm x 1200mm White £525 – £575
1200mm x 1200mm Wood Grain £675 – £725

Tilt and turn window costs

These windows are far more contemporary in design, being designed to open inwards, with a hinging side and bottom for ease of opening in two separate ways. As they allow for easy cleaning, they are the perfect choice for upper-storey rooms and high-rise apartments which may otherwise prove tricky or even dangerous to clean from the inside.

Window Size Price per Tilt and Turn uPVC Window
80cm x 80cm £420 to £580
100cm x 100cm £580 to 640
120cm x 120cm £640 to £700

Sash window costs

Sash windows are the traditional choice for many period and traditional home owners. Starting at around £500 and costing up to £1,000, depending on their size, this is the perfect choice for those who want to modernise their Georgian or Victorian properties without losing any sense of period style.

How Much Do Sash Windows Cost?

Casement Window Size Colour Guide Price
500mm x 500mm White £525 – £600
500mm x 500mm Wood Grain £625 – £700
1000mm x 500mm White £600 – £700
1000mm x 500mm Wood Grain £700 – £800
1000mm x 1000mm White £625 – £725
1000mm x 1000mm Wood Grain £725 – £825
1200mm x 1200mm White £725 – £825
1200mm x 1200mm Wood Grain £850 – £950

Bay window costs

While bay windows are more expensive than other window installations, they are definitely worth the extra money if you are looking to create more space within your home. They also add a lot of market value to your home, especially when fitted onto upper-storey rooms.

What is the average cost to replace a bay window?

Bay windows aren’t just a way to bring in more light into your property, they also add extra space to your living area. Made of between 3 to 5 different casement windows, bay windows bend round in either a semi-circle or a rectangle, providing a wide panoramic view outside.

Jutting out from the wall, the additional floorspace created by a bay can be utilised as extra space in the interior room or be fitted with a window seat for extra comfort and storage solutions.

Because of the more structural element to a bay window, the cost to replace a bay window is typically between £1,000 and £2,000, depending on the installer you choose.


Bay Window Prices

Bay Window Prices (3 Section)

Casement Window Size Colour Guide Price
2400 x 1200 White £1050 – £1150
2400 x 1200 Wood Grain £1150 – £1250
2400 x 1500 White £1125 – £1225
2400 x 1500 Wood Grain £1250 – £1350
3000 x 1200 White £1150 – £1250
3000 x 1200 Wood Grain £1275 – £1375
3000 x 1500 White £1250 – £1350
3000 x 1500 Wood Grain £1375 – £1475

Bay Window Prices (4 Section)

Casement Window Size Colour Guide Price
3000 x 1200 White £1400 – £1500
3000 x 1200 Wood Grain £1525 – £1625
3000 x 1500 White £1500 – £1600
3000 x 1500 Wood Grain £1650 – £1750
3600 x 1200 White £1500 – £1600
3600 x 1200 Wood Grain £1650 – £1750
3600 x 1500 White £1600 – £1700
3600 x 1500 Wood Grain £1750 – £1900

Bay Window Prices (5 Section)

Casement Window Size Colour Guide Price
3600 x 1200 White £1850 – £2000
3600 x 1200 Wood Grain £1900 – £2050
3600 x 1500 White £1950 – £2100
3600 x 1500 Wood Grain £2050 – £2200
4000 x 1200 White £1900 – £2050
4000 x 1200 Wood Grain £2000 – £2150
4000 x 1500 White £2050 – £2200
4000 x 1500 Wood Grain £2150 – £2300

How much do frame materials cost?

Another factor to take into account when considering the price of your double glazing window replacement is what materials the frame is being made out of.

There are three freely available materials offered by the vast majority of installation companies, each one with its own benefits, drawbacks and cost:

uPVC – the modern and most affordable and widely available material, it is the most popular and commonly used by homeowners throughout the country for their double-glazing solutions. A hardened resin made of unplasticised polyvinyl chloride, it is extremely durable and has a lifespan of up to 30 years. The cost of uPVC-framed double glazing windows typically start at around £250.

Wood / Timber – The traditional option, timber frames are often sought out for their ornate appearance. However, they can often be harder work to maintain than other frame materials, as they often need additional sanding, varnishing and repainting in order to keep their high-end appearance. Wooden window frames typically cost the same as uPVC to install, but do end up costing you more in terms of additional upkeep costs over the years.

Aluminium – Aluminium is becoming more and more popular as an option for double glazing windows and doors, often seen as the far more modern solution. Made of sustainable, natural materials, it is not as harmful to the environment as uPVC, and is also longer lasting. However, this does often mean that aluminium windows are a bit more expensive than uPVC.

Are wooden windows cheaper than uPVC?

While wooden and timber framed windows typically cost the same as uPVC windows in terms of installation, they can end up costing you more through their need for additional upkeep. Over the years wooden windows can suffer from natural wear-and-tear, meaning that to keep their appearance they need to occasional sanding, varnishing and repainting.

uPVC on the other hand is far more durable, lasting for 25-30 years before any signs of cracking or discolouring begin to show.

How much can double glazing save you?

The real perk to getting double glazing installed onto your property is that with the added thermal insulation that these new windows give you, you can save a lot of money on your energy bills.

The extra thickness of the double glazing in your new windows provides a barrier to prevent the warm air inside your house from escaping outside, as well as blocking any cold air from coming in from the outside. This is especially beneficial in winter, as your home will remain warmer for longer and means that you will not be as reliant on your central heating.

Overtime, the amount of money that you can save on your heating means that often the windows will end up paying for themselves. While the amount of money saved often relies on the energy rating of the windows themselves, you can easily save up to £120 a year in heating bills.

Frequently Asked Double Glazing Questions

Frequently Asked Double Glazing Questions

Do UPVC Windows Need Trickle Vents?

Trickle vents are not a requirement, however they do offer additional ventilation without the need for opening your windows so can be a valued add on.

How Long Will It Take To Install My Casement Window?

Because every job is different, it is best your talk to your double glazing installer who will be able to give you an exact timescale.

Are There Other UPVC Casement Window Styles?

Other UPVC casement window styles include the French casement window which is a more traditional take on the standard casement style.

Will I Have A Choice of Casement Window Locks?

A high security lock will be fitted as standard with your new casement window but your double glazing installer will also offer a choice of security upgrades.

What Are Flush Casement Windows?

Flush casement windows are where the unit sits flush to the frame, creating a super sleek look.

Are There Different UPVC Casement Window Sizes?

UPVC casement windows come in a wide range of sizes to suit your property. You can specify your casement window size in our window cost calculator to get a unique window price!

Can I Choose My Casement Window Handles?

Your double glazing installer will offer you a choice casement window handles and casement window hardware options so you can achieve the perfect look.

What is a Casement Window?

A casement window is attached to its frame by one or more hinges. A casement window is hinged at the side allowing them to open extremely wide. These windows can double up as emergency exits and are perfect for hard to reach places within the home, with many home owners installing these windows behind their kitchen sinks.

Where Can I Get A Tilt and Turn Windows Price?

You can get a tilt and turn windows price using our window cost calculator which will give you a free and unique quote within a matter of minutes.

How Does The Tilt and Turn Window Mechanism Work?

The tilt and turn window can be ‘tilted’ inwards due to its unique turning action which allows the window to be easily accessed from both inside and out. All it takes is a swift turn of the handle.

How Much Do French casement windows cost?

The cost of French casement windows will vary depending on installer but you can get an average casement windows cost using our free online quoting engine

How do UPVC Sash Windows Work?

UPVC vertical sliding sash windows are built to either slide vertically downwards or upwards. This opening function makes the UPVC sash window much easier to use compared to traditional wooden windows where the only choice is double hung and single hand.

Are UPVC Sash Windows Easy To Use?

UPVC sash windows are very easy to use. Their spiral balance mechanism allows for smooth operation so you can open and close your windows with ease. UPVC sash windows are also incredibly low maintenance and require very little cleaning.

Why Should I Choose a UPVC Sash Window?

UPVC sash windows are incredibly attractive and make a stunning addition to any property and are relatively low maintenance thank to their UPVC design. You can enjoy a traditional aesthetic for many years to come thanks to their long standing properties.

Replacement Sash Windows In A Conservation Area

If your home is a listed property or within a conservation area then you will need to seek planning permission.

Bay or Bow Window?

Simply put, it really depends! Bay windows offer often much welcome and useful extra storage space to the frontage of homes. On the other hand, bow windows provide a curved shape alternative in terms of look compared to bay windows. They are both beautiful options and can add much character and charm to the right property.

Can Bay Windows Look Modern?

Bay windows can easily be either modern or traditional depending on the combination of glass and / or coloured uPVC profiles now available. Subsequently, its easy for these windows to seamlessly blend in with contemporary or old properties.

Can Double Glazed Windows Reduce My Heating Bills?

When you install double glazing in your home or commercial property, it is likely that the extra heat retention will lessen the need to use central heating systems. In turn, this could mean you see a drop in heating bills. If you are concerned about your energy bills, it is easy to compare business energy or home energy online.

What Makes Flush Sash Windows Different?

Flush sash casement windows are specifically designed to imitate the appearance of traditional wooden timber windows by appearing to have the same sashes that finish 'flush' with the outside face of the window.

Should I replace my old sash windows?

Sash windows are a key feature for many traditional period buildings. Sash windows were traditionally built using timber, which is fairly high maintenance and has a tendency toward rotting and warping. Over time, these windows can become draughty and insecure. uPVC sash windows are a great way to experience the benefits of modern double glazing, without sacrificing the aesthetic of your home. uPVC sash windows will not rot or warp and require little maintenance. They are also thermally efficient, which means that your home will not require as much heating.

How much does sash window restoration cost?

The cost of sash window restoration will depend on the survey result. Standard draught proofed sash windows (without sill replacement) usually starts at about £500 per window. The time taken will also depend on the survey result.

Can I install double glazing into my original sash windows?

This will depend upon what type of window you have. Replacing existing moving sashes with new, double glazed replicas might to be possible.

How much does it cost to replace a sash window?

The cost of replacing a sash window will depend on many factors including: style, size, material and glazing. A wooden sash window will cost significantly more than a uPVC sash window. A wooden sash window can cost up to £1000. Wooden windows are more expensive to manufacture so expect to pay that bit more. uPVC sash windows can be designed to mimic wood and are much cheaper in price. The starting price for a standard uPVC sash window is on average £525.