Double Glazing Costs 2023 | Try Our Calculator

✔ The average cost of a double-glazed window is £1,200

✔ Double glazing for a three-bedroom house costs £11,050 on average

✔ The average bay design is twice as expensive as almost any other type

Double glazing is a win-win-win: it will typically save you £195 per year on heating bills, make your home harder to burgle, and keep you shielded from the noise and cold of the outside world. All of these benefits for the average cost of £1,200 per window.

Want to skip the reading? You can compare the best double glazing prices by popping a few details about your home in our easy-to-use quote tool. We’ll pass on your details to our trusted suppliers, who’ll get in touch with you with free quotes for you to compare.

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What's on this page?

01 How much does double glazing cost?
02 Double glazing cost calculator
03 Double glazing savings calculator
04 The cost of double glazing based on house size
05 Factors that affect the cost of double glazing
06 How much money can double glazing save you?
07 Cost of replacement vs new
08 The cost of double-glazed doors
09 Double glazed windows: maintenance costs
10 Summary
11 Double glazed windows costs: FAQs

How much does double glazing cost?

Type of window frame (100cm x 100cm)	Average cost per window
uPVC	£1,200
Wood	£1,500
Aluminium	£1,800
Steel	£2,500

Prices are an average from various window suppliers, based on our independent research. Last updated August 2023.

If you're replacing your windows at home, you can expect to pay an average of £1,200 per window.

However, every window is special, standard sizes don’t really exist, and every supplier will charge you different amounts – but you need to be able to compare prices.

On top of this, installation can cost around an extra £250, but it’s worth it for that professional touch.

Bear in mind that if your installer needs to put up scaffolding to get to your window, that’ll also cost extra – and the higher the window, the higher the price.

If you’re getting a bay window replaced, installers will also need more time (and, therefore, more money) to fit it. It’ll take about half a day for two people, whereas simpler models like casement windows can be done and dusted in a couple of hours.

Want to cut back on costs but improve your property's insulation? You could look into draught proofing your windows.

The cost of double glazing a three-bedroom house

Looking to install more than one double glazed window into your property? The price will mount up pretty quickly.

Installing double glazed windows in the average three-bedroom house in the UK will cost around £11,050, including installation. However, this figure will increase if you're installing pricier models, such as bay windows, or using an expensive material, such as aluminium.

The cost of double glazing based on window style

Window style	Size	Average cost (not including installation)
Casement	1,000 x 1,000	£600-£900
Tilt and turn	1,000 x 1,000	£750 – £1,125
Sash	1,000 x 1,000	£900 – £1,350
Bay windows (three sections)	3,000 x 1,200	£1,500 – £2,250

Last updated August 2023.

Window prices vary widely based on style, but in general, casement windows – with their simple hinges and traditional appearance – are the cheapest option. There’s a reason why they’re the most common window type in Europe.

Sash windows, which are more popular in the UK days, are a little more expensive. However, they're just as intuitive as their casement counterparts: just push up or down to open and close.

You could also opt for the slightly pricier tilt and turn, which can be opened horizontally or vertically, or a dual turn, which is a sash window where both parts rotate vertically instead of sliding up and down.

The most expensive style is the bay window. These large windows let in a lot of light, and create the illusion of a bigger space – but they’ll cost you. The average bay design is twice as expensive as almost any other type.

Double glazing cost calculator

Use our double glazing cost calculator to check how much you're likely to pay for your new windows.

Double glazing savings calculator

With this second calculator, you can find out how much typical households of different sizes are likely to save with new double-glazed windows.

Though of course, this doesn't measure the lovely comfort of having a warmer home.

What type of double glazing do you need?

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The cost of double glazing based on house size

Check out the table below to get a better idea of how much you can expect to spend on your new double glazed windows. These figures don't including installation, which costs around £250 per day.

Property size	Number of windows	Window frame material	Average cost
Flat	4	uPVC	£4,800
Flat	4	Wood	£6,000
Flat	4	Aluminium	£7,200
Bungalow	8	uPVC	£9,600
Bungalow	8	Wood	£12,000
Bungalow	8	Aluminium	£14,400
Mid-terrace	12	uPVC	£14,400
Mid-terrace	12	Wood	£18,000
Mid-terrace	12	Aluminium	£21,600
Semi-detatched	16	uPVC	£19,200
Semi-detatched	16	Wood	£24,000
Semi-detatched	16	Aluminium	£28,800
Detatched	20	uPVC	£24,000
Detatched	20	Wood	£30,000
Detatched	20	Aluminium	£36,000

Last updated August 2023.

As you can see, the costs of a new set of windows will vary, depending on the amount you get, as well as the material you pick. But remember, these are just estimates – the price of your windows will fluctuate depending on the size, type, and style you choose.

If you’d like to learn more about the cost differences between window types, head over to our Best Double Glazed Windows page.

Factors that affect the cost of double glazing

Many factors affect the cost of double glazing, which is why prices can vary widely from window to window. Here are some of the key ones:

Window style
Frame material
Type of glass
Window size
Extra finishes

Window style is a very big cost determiner. The main reason the difference in prices between styles is the complexity of the design. Casement windows – the cheapest kind – have simple hinges, whilst more expensive sash windows require a pulley and weight mechanism to operate.

Frame material will also affect the cost, since some materials, such as wood timber, are more expensive to manufacture than others, such as uPVC. The higher cost of the frame will be added onto the overall cost of the window.

The type of glass a window has will also affect the price. Glass rated A++ for thermal efficiency (meaning it has high insulating qualities) is more expensive than glass with a lower rating, such as B or A. But that’s not all, coloured, grainy, or obscure glass, will all be more expensive than standard glass.

Window size affects the cost of double glazing in a straightforward way. The larger a window is, the more material it uses. More material equals a higher cost.

Extra finishes, such as window locks, additional window openings, or ornate window handles will all add the the overall cost. These types of personalised designs aren't standard, so they require extra manufacturing.

How much money can double glazing save you?

Homeowners can roughly £195 a year on heating bills by installing A-rated double glazing windows in an entirely single-glazed semi-detached property, according to the Energy Saving Trust.

Want to go a step further? You could try installing A++ rated double glazed windows, which will typically lead to savings of about £235 a year.

We’ve outlined how much money you could save each year if you install double glazing on an entirely single-glazed house:

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Cost of replacement vs new double glazing

Some homeowners might be able to get away with just replacing the glass in their windows, rather than getting rid of the window altogether and buying a new one.

Not only is this cheaper, but it can also avoid having to fork out a few hundred for expensive installation costs.

According to CheckaTrade, the average replacement double glazing window cost is £250 – much more affordable than the average £1,200 to get a new one.

However, replacing the glass in your double glazed windows won't solve all your issues.

For example, if your windows have a misting issue, it sometimes means moisture has seeped into the gap between the panes of glass – in this circumstance, glass replacement is the right thing to do. However, if there's an issue with the frame, glass replacement will just be a waste of time and money – you'll have to replace the whole unit.

Want to find out about more cheap double glazing options? Check out our page, Second-Hand Double Glazed Windows: Are They Worth It?

The cost of double-glazed doors

Prices start as low as £300 for a 90 x 210cm front door with double-glazed glass, though this will rise to around £550 when you include the installation cost.

The average overall cost for a double-glazed front door is £700, though your exact price will depend on the materials used, your supplier, and how large your product needs to be.

Sliding French doors with double glazing carry a heftier price tag, and the bigger they are, the harder they are to afford.

You can expect to pay an average of £1,200 for this type of design, though prices can go as high as £2,000 – so make sure to decide beforehand how much you want to spend.

Double glazed windows: maintenance costs

Double glazed windows do not require a lot of maintenance. The main thing you need to do is clean your windows once or twice a year.

You can clean the windows yourself, but you can also hire a professional. Window cleaning costs £40 to £150, depending on the area and the size of the house.

If there's condensation on double glazing, it could be a sign that there’s a gap in the sealant. Having this fixed will typically cost £20 to £70.

Other small issues such as broken hinges cost around £80 to repair, whilst a broken window pane will cost around £150 to fix.

Next steps

Double glazing costs a sizeable amount, but it can improve your property by providing an extra layer of insulation, saving you money on bills, and adding more security to your home.

If you’re ready to buy a new window which will help you to banish the cold, repel external sounds, exile condensation, and keep burglars out, then double glazing is the one for you.

Fill in your details for free quotes and get moving towards your double-glazed future.

7 tips to help you get the best deal on double glazing

Shop around and get multiple quotes
If you get a company to measure your windows and give you a quote at home, hear them out – but don’t sign a contract on the spot
Hire a professional to install your new double-glazed windows
Get a locally based company for the installation, as its workers won’t have to spend as much time travelling to and from the job, and therefore won’t have to charge you extra
Check you don’t live in a conservation area or listed building
Decide ahead of time how much you and your loved ones want to spend on the new windows
Check the U-value of a window before buying it – it should ideally be around 0.6 or lower

Double glazed windows costs: FAQs

It’s actually possible to fit double glazing yourself – but it’s not recommended. Although you’ll be able to save money on the installation, it could lead to inefficient windows, more expense in the long run, and possibly an injury.

The following authorities play an important role when it comes to ensuring high standards in the double glazing industry:

Fenestration Self-Assessment Scheme (FENSA): Members who are registered with FENSA are compliant with up to date thermal performance standards, which means that the double glazing they install meets the necessary energy-efficiency standards
Double Glazing & Conservatory Ombudsman Scheme (DGCOS): Monitors UK double glazing installers to make sure they meet appropriate quality and service levels. This means that those using a DGCOS-registered company are able to benefit from increased protection
Certass: This government-backed agency operates on a not-for-profit basis, and aims to increase consumer confidence through the evaluation of registered contractors
TrustMark: TrustMark endorses companies in a variety of trades and industries as long as they meet government-approved guidelines and standards

Your double glazing quote should provide you with an estimated price of replacing your windows – tailored to your specific requirements.

Since there are so many varying factors affecting the price of windows, we wouldn't recommend relying on just one quote. This will give you a better idea of what a reasonable price actually looks like.

Local and national installers both have their pros and cons. On the one hand, local installers are likely to provide a cheaper deal, whereas national companies are more likely to be trusted by users because they’re more well known. You can learn more about local and national double glazing companies, which one will be better for you, and how we rate them by visiting our Best Double Glazing page.

There are lots of different options when it comes to the type of double glazing you want for your home – however, the one you go for will depend entirely on your circumstances. We’ve listed a few of the main options below:

Annealed or float glass – This is basic double glazing glass. It’s the cheapest option, quite strong, and difficult to break, especially when used in double glazed fittings
Toughened or tempered glass – This is about three to four times tougher than float glass. However, because of its safety features and specialised manufacturing process, it’s one of the more expensive options
Laminated glass – This acts as a layer of security for your double glazing. The PVB (polyvinyl butyal) laminate is very secure – if the glass ever breaks, it remains stuck to the laminate
Noise-reduction glass – This glass has acoustic inner layers of PVB, which absorb sound so that very little of it makes its way inside. To make it even more effective, you can use layers of different thickness

The overall price of double glazing will depend on the:

Style
Frame material
Company you choose
Need for scaffolding
Number of windows you want

Not only does the frame affect the price of your window, but the glass does, too. Double glazing has come on leaps and bounds in the past decade, offering a range of different types of glass which all serve a different purpose.

If you’d like a basic double glazed window, you could go for annealed (otherwise known as float) glass. It’s the cheapest option, but is still particularly difficult to break. On the other hand, if you want to go for an even stronger glass, such as toughened or tempered glass – which is about three to four times tougher than float glass – this will cost you.