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Why get double glazing?

  • Save up to £195 per year on energy bills
  • Improve your property's value
  • Reduce outside noise

Double Glazed Window Costs 2024

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

It can save the average home up to £180 a year on their energy bills

The cost of double glazing varies widely depending on size, design, and material


Let's not beat around the bush, installing doubling glazing is expensive, costing upwards of £10,000 for the average home. It's well worth it though, since your new double glazed windows will make your home warmer, quieter, and more secure.

Plus, double glazing can save the average household up to £180 a year on their heating bills, according to the Energy Saving Trust, so you'll make back some of the money you've spent.

We'll break down double glazing costs by house size, window material and design in this article, so you can make an informed decision on what option is best for you.

If you want to compare prices from different installers, we can help. Just fill in our short form, and we'll pass on your details to our trusted double glazing suppliers. They’ll reach out to you with free quotes for you to compare.

What type of double glazing do you need?

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How much does double glazing cost in the UK?

The cost of double glazing can vary by a lot depending how many windows you're installing, the style of windows, the materials they're made of, and the installer you choose.

Here's everything you need to know about the cost of double glazing:

  • Double glazing costs £1,200 per window on average
  • Bay windows are the most expensive window design, because they're large, and take longer to install
  • Installation costs around £250 per day, the time it typically takes to install double glazing
  • The average three-bedroom house will spend £11,050 on double glazing

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

Window prices vary widely based on style, here's a summary of the different types:

  • Casement windows – the cheapest option. Hinged windows with handles
  • Tilt and turn windows – slightly pricier. Can be opened horizontally or vertically
  • Sash windows – popular in the UK, but one of the most expensive designs. Can be pushed up to open
  • Bay windows – twice as expensive as other designs. Large windows that let in a lot of light and often can't be opened
Window styleAverage cost (not including installation)

Casement

£600-£2,700

Tilt and turn

£750 – £3,375

Sash

£900 – £4,050

Bay windows (three sections)

£1,500 – £6,750

Prices are an average from various window suppliers, based on our independent research. Last updated February 2024.

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

You can also take a look at this table to see the cost of double glazing based on house size. 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 February 2024.

Did You Know?

You should expect to pay an extra amount of between 10% and 20% of the cost to add a colour finish.

How much does uPVC double glazing cost in the UK?

Here's the price range you can expect for uPVC double glazing based on which window style you choose:

uPVC window style

Cost

Casement

£600-£1,800

Tilt and turn

£750-£2,250

Sash

£900-£2,700

Bay

£1,500-£4,500

uPVC windows are the cheapest option for double glazing.

If the upper price range seems outrageously high, don't worry, it's largely based on window size. It's unlikely you'll pay this much per window, unless all the windows in your home are gigantic.

How much does aluminium double glazing cost in the UK?

Here's how much aluminium double glazing costs based on which window style you choose:

Aluminium window style

Cost

Casement

£750-£2,250

Tilt and turn

£938-£2,813

Sash

£1,350-£4,050

Bay

£3,750-£11,250

Windows with aluminium frames are around 25% more expensive than ones with uPVC frames.

As before, the higher price ranges reflect how much you'd pay for very large windows.

How much does wood double glazing cost in the UK?

The cost of wood double glazing also varies depending on the style of window you choose. Here are the price ranges you can expect:

Wood window style

Cost

Casement

£900-£2,700

Tilt and turn

£1,125-£3,375

Sash

£1,350-£4,050

Bay

£2,250-£6,750

Wood is the most expensive frame material for windows, but a wooden windows' lifespan also tends to be longer than windows with other frame materials, if you take care of them well.

How much money can I save with double glazing?

You can save roughly £165 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 £180 a year.

After 20 years, the average UK home with A- rated double glazing will save around £3,300 on their energy bills, compared to if they'd kept their single glazing.

Here's how much you could save with A- and A++ double glazing:

Window efficiency rating

Energy bill savings after a year

Energy bill savings after 20 years

A- double glazing

£165

£3,300

A++ double glazing

£180

£3,600

We've created a double glazing savings calculator, where you can find out how much typical households of different sizes are likely to save on energy bills.

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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sun beaming through double glazed window

Are there any grants for double glazing in the UK?

There are several grants in the UK for energy efficient home improvements, which cover double glazing.

These include the ECO4 scheme, the Home Upgrade Grant, and the Home Energy Scotland Loan.

The ECO4 Scheme could cover up to 100% of the costs of double glazing, and is available for people living in energy inefficient homes who receive certain government benefits.

The Home Upgrade Grant can cover up to 40% of the cost of double glazing. It's open to low-income households who are off the gas grid and are located in one of 45 select local authorities in England.

The Home Energy Scotland Loan is an interest free loan offered by the Scottish government. It can be accessed by any resident in Scotland seeking to install double glazing.

For more details on double glazing grants, including what they offer and eligibility criteria, visit our page.

What do I need to think about before buying double glazing?

Before buying double glazing, it's a good idea to think about what materials and designs you want, as well as any other factors that might affect the cost. Here's what you should consider:

  • Window style – Some window styles, such as sash windows, have complex opening mechanisms, which increases their cost
  • Frame material – Some materials, such as wood timber, are more expensive to manufacture than others, adding to the overall cost of the window
  • Type of glass – Glass rated A++ for its high insulating qualities is more expensive than glass with a lower rating, such as B or A. Coloured, grainy, or obscure glass, will all be more expensive than standard glass
  • Window size – The larger a window is, the more material it uses. More material equals a higher cost
  • Extra finishes – Window locks, additional window openings, or ornate window handles will all add the the overall cost, as these personalised designs require extra manufacturing

How expensive is it to maintain double glazed windows?

Double glazed windows are not very expensive to maintain. The main thing you need to do is keep them clean. Here's what you can expect to pay for different services:

  • Window cleaning: £40 to £150, depending on your area and the size of your home. Only needs to be done twice a year
  • Getting rid of condensation: £20-£70 to refill a gap in the sealant, the most common cause of condensation on double glazing
  • Small repairs: £80-£150 to fix issues such as broken hinges or panes

Should I just replace my window panes or install new double glazed windows?

Replacing the pane in a double glazed window cost £250, according to CheckaTrade, much cheaper than the £1,200 it costs for a completely new window.

While it's a tempting option, replacing the glass in your double glazed windows isn't always a good idea.

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?

Is it expensive to get doors double-glazed?

Prices for double glazed doors start as low as £300 for a 90 x 210cm front door with double-glazed glass, but can get as expensive as £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.

Will double-glazing keep my house safe?

Double glazing can keep your house safer than single glazing would.

Two panes are harder to break than one, it's simple math. This means that a potential burglar would have to take more time to try and break the second pane, creating noise, and increasing their risk of being caught. The gaps of air or gas in between the panes also act as shock-absorbers, making it unlikely than anyone would get through the outer pane in the first place.

Plus, most modern double glazing is made with toughened glass (glass that's been treated with heat and chemicals), which is much stronger than the standard float glass used in old double glazing.

With all these factors combined, today's double glazed windows are extremely hard to break.

How do I start double-glazing my house?

  1. Shop around and get multiple quotes
  2. 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
  3. Hire a professional to install your new double-glazed windows
  4. 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
  5. Check you don’t live in a conservation area or listed building
  6. Decide ahead of time how much you and your loved ones want to spend on the new windows
  7. Check the U-value of a window before buying it – it should ideally be around 0.6 or lower
  8. Fill in your details for free quotes and get moving towards your double-glazed future.

Summary

  • Double glazing can save you up to £180 on energy bills
  • A new double glazed window costs £1,200 per window on average
  • Size, frame material, window design, and glass type can affect the cost
  • Cleaning double glazed windows cost £40-£150 twice a year
  • Replacing a double glazed pane cost around £250
  • Double glazed doors cost £700 to £2,000, depending on design
  • Double glazing is very difficult to break
  • You can get free quotes for double glazing by filling in our short form

Double glazed windows costs: FAQs

You can technically install double glazing yourself – but it’s not recommended.

Even if by doing it yourself you’ll save money on labor cost, 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

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
Written by:
Beth has been writing about green tech, the environment, and climate change for over three years now – with her work being featured in publications such as The BBC, Forbes, The Express, Greenpeace, and in multiple academic journals. Whether you're after a new set of solar panels, energy-saving tips, or advice on how to reduce your carbon footprint, she's got you covered.
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