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Last updated on February 7th, 2024

How much does double glazing cost?

Are you looking to install new double glazing in your home? Then you've come to the right place. In this guide we look at the average double glazing cost in the UK, and the options available.

Fast Facts

  • Double glazing can cost anywhere from £300 – £5,000+ per window
  • The average cost of a double glazing for a 3-bed house is around £5,000 – £7,000
  • The type and number of windows will majorly affect the total cost of double glazing

Installing double glazing in your home can increase the security of your property. It can also help reduce your energy bills and improve temperature control in your home.

Keep reading to find out more about average double glazing costs in the UK.

Average prices are based on uPVC casement windows. The higher prices cover windows such as sash, bay and timber frames.

How much does double glazing cost?

The costs below are for supply and installation of double glazing windows in the UK.

Type of windowRange - LowRange - HighAverage cost
Casement windows£300£800£500
Sash windows£500£1,500£1,00
Sliding windows£400£1,000£700
Tilt and turn windows£400£1,000£700
Bay windows£1,000£4,000£2,500
Bow windows£1,500£5,000+£3,000

Our costs are ballpark averages – get a local tradesperson to quote now

One of the key factors that affects the replacement cost of double glazing for your home is the type of windows you have – both the style and material.

For example, sash windows will cost more than casement windows, while uPVC will cost less than wood or aluminium.

How much does double glazing cost for a new window?

Here are some guide prices for average double glazing costs in the UK by window type:

  • Casement windows – £300 to £800 per window
  • Sash windows – £500 to £1,500 per window
  • Sliding windows – £400 to £1,000 per window
  • Tilt and turn windows – £400 to £1,000 per window
  • Bay windows – £1,000 to £4,000 per window
  • Bow windows – £1,500 to £5,000+ per window

Want prices for doors? Check out our guide to double glazing door costs.

What is the cost of replacing double glazing for a 3-bed house?

The cost of adding double glazing to a 3-bedroom house, based on roughly 8-12 windows, is around £5,000 to £7,000.

The larger your home, the higher the price of double glazing. That’s because the cost of double glazing will depend on how many windows your home has.

When asking for a quote, count all the windows you’re going to need double glazing for. That way the glazier can provide you with a more accurate estimate based on those numbers.

Labour costs for double glazing

Most double glazing jobs require two installers to carry out the work. The average cost for two double glazing installers is around £500 a day.

Double glazing hourly rates

The average hourly rate for a glazier or double glazing installer is usually around £25 to £35 per hour.

A typical day rate for a double glazing installer is somewhere in the region of £200 to £280 per day.

As you’d expect, hourly rates and day rates vary by region. You’ll typically pay more in London and the South East of England, compared to the rest of the country.

The best way to get accurate costs for double glazing in your area is to contact multiple local tradespeople for quotes.

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Double glazing cost calculator

If you know what type of windows you want to install then you can calculate the total cost of your new double glazing. Here’s the quick way to calculate the cost:

Cost of windows + Labour cost + Additional costs* = Total double glazing cost

*Additional costs might include scaffolding, specific non-standard locks, upgraded glass, and special window treatments.

Some of the additional costs to factor in are:

  • Scaffolding hire – £100 a day
  • Plasterer (to repair any damage around the windows) – £30 to £35 per hour

Glazier installing double glazing

Factors affecting the cost of double glazing

A number of factors will affect how much you pay for your home’s double glazing. These include:

  • Number of windows
  • Type of window
  • Quality and type of glass
  • Type of window locks
  • Access to the property
  • Any scaffolding needed
  • Where you live

Any special requirements will also add to the double glazing cost. Expect to pay more for coloured window frames, A-rated windows, or special locking mechanisms.

If in doubt, ask your local double glazing specialists for an inspection and consultation before getting a quote.

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Comparing double glazing prices

One of the key factors affecting the replacement cost of double glazing for your home is the type of windows you have – both the style and material.

As long as you’re aware of them, you’ll be able to make an informed decision. We recommend speaking to at least three double glazing installers for quotes and then comparing them.

Keep in mind the following factors that may affect your rates:

  • Type of glass: There are different types of glass available, including toughened, frosted, and self-cleaning and they all have different prices
  • Location of the windows: Double glazing windows on upper floors could cost more than those on the ground floor
  • Energy efficiency ratings: Double glazing with high energy efficiency ratings will cost more
  • Type of window: The double glazing cost for a new window varies according to the type of window it is.
  • Your location and labour charges: London and the South East are more expensive than other parts of the country.

Double glazing quotes

If you’re at the point of wanting to get quotes for new double glazing, there are a few things you can do to make sure your price is as accurate as possible.

  1. Count the number of windows you want double glazing for
  2. Note where the windows are on your property (e.g. front, back or side, upstairs or downstairs)
  3. If possible, measure the size of your windows to give a rough idea – although any professional double glazier will want to come out and measure up this themselves

It’s always sensible to keep a contingency fund of around 10 – 15% to cover unexpected costs or slight changes to the spec of your double glazed units.

Ready to find local double glazing experts? Simply enter your postcode in the box below and search our online directory of approved local tradespeople:

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Types of window for double glazing

Overall, the choice of window type and upgrades will depend on various factors, including the building’s architectural style, budget, and energy efficiency needs.

That’s why it’s essential to consult with a professional window contractor to determine the best window type and upgrades for your building.

Here are some of the most common types of windows, their benefits and potential upgrades:

Single hung windows

Single hung windows are one of the most popular types of windows in residential buildings.

They consist of two sashes, one fixed and one movable, which can be opened by sliding them vertically.

Benefits of single hung windows include their low cost, ease of use, and easy maintenance.

Upgrades for single hung windows include energy-efficient glass, which can reduce energy costs, and tilt-in sashes, which make cleaning your windows easier.

Double hung windows

Double hung windows are similar to single hung windows. However, both sashes are movable and can be opened by sliding them up or down.

The benefits of double hung windows include their versatility, as they can be used in a variety of architectural styles.

They’re also able to provide better ventilation than single hung windows.

Upgrades for double hung windows include insulated frames, which improve energy efficiency. You can also include high-performance glass, which offers better insulation and reduces noise.

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Casement windows

Casement windows are hinged on one side and open outwards. They provide excellent ventilation in almost any type of building.

The benefits of casement windows include their durability, security, and energy efficiency.

Upgrades for casement windows include multi-point locking systems, which increase security. You can also add energy-efficient glass, which helps to reduce your monthly bills.

Awning windows

Awning windows are similar to casement windows. However, they’re hinged at the top and open outwards from the bottom.

Awning windows are often used in basements and bathrooms where ventilation is essential but privacy is a concern.

The benefits of awning windows include their energy efficiency, versatility, and ease of operation.

Upgrades for awning windows include insulated frames, which improve energy efficiency, and soundproof glass, which can help to reduce noise levels.

Sliding windows

Sliding windows have two or more sashes that slide horizontally. They’re easy to use and also offer excellent ventilation.

The benefits of sliding windows include their affordability, versatility, and low maintenance.

Upgrades for sliding windows include energy-efficient glass to reduce energy costs. Reinforced frames also increase durability and security.

When you request a quote for your double glazing needs, try to give as many details as possible. Include the above factors as well as the size of your house.

Which type of double glazing is best?

UPVC double glazed windows

UPVC is one of the most popular choices for double glazing. Here’s a run-down of why you might want to choose uPVC windows for your home’s double glazing:

  • They can be up to three times cheaper than wooden frames
  • uPVC delivers market-leading energy efficiency – keeping your heating bills down
  • They’re recyclable, so when your windows are removed the plastic can go on to be reused
  • uPVC windows are very durable and easy to keep clean
  • You can now get uPVC double glazing in a variety of colours and finishes, including a wood effect
  • If you have a bay window, uPVC windows can be designed to perfectly fit the sweeping design of your existing windows

Window door and glazing companies

Timber double glazed windows

Whilst not as energy efficient or cheap as uPVC, timber is, as you’d expect, the more environmentally friendly option when it comes to installing new double glazed windows on your home.

  • Wood is naturally renewable and timber windows don’t require the chemicals and intensive processes that uPVC windows do
  • Wooden windows are generally considered to look better, especially if your home is a period property
  • Timber windows are available in the same range of styles as uPVC. And, if looked after, can last a lifetime – making the initial investment worthwhile.

Aluminium double glazed windows

Presenting a slimmer, sleeker and lighter profile, aluminium double glazed windows can give a home an ultra-modern look.

  • Aluminium is a super strong and weather-resistant material (it’s used to build aeroplanes!)
  • With amazing durability and low maintenance, the higher initial investment often pays off in long run
  • Although typically supplied in its natural silver colour, aluminium double glazing can be painted in a number of shades
  • As with uPVC and timber windows, aluminium double glazed windows can be designed to tilt and turn and fit a bay window.

Steel double glazed windows

Similar in appearance to aluminium windows, steel double glazed windows are ultra slim with minimal frames.

  • Steel double glazing echoes the style of traditional brick warehouse windows, typically popular on industrial heritage buildings
  • It’s become a popular choice for homeowners looking for that minimal, industrial look in their homes
  • Usually seen in black, steel windows are easily painted in all colours to suit the style of your property

Types of windows for you home - arty image of stacked windows in a featureless room

Glass upgrades available

Although double glazing already provides good insulation, reduces noise, and enhances energy efficiency, there are various types and potential upgrades to consider, including glass options.

Here are some of the most common upgrades available:

Standard double glazing

Standard double glazing consists of two glass panes with a gap between them. This gap is filled with air or an inert gas like argon and provides insulation.

You can coat the glass panes with a low-emissivity (Low-E) coating that reflects heat back into the room and helps reduce energy bills.

Potential upgrades for standard double glazing include triple glazing, which adds an extra pane of glass for even better insulation and noise reduction.

You can also include high-performance Low-E coatings, which offer better insulation and solar control, keeping your home cool in summer and warm in winter.

Laminated double glazing

Laminated double glazing consists of two or more glass panes with a layer of polyvinyl butyral (PVB) between them.

The PVB layer acts like a barrier that prevents your windows from shattering due to an impact. This makes it an excellent option for safety and security.

Potential upgrades for laminated double glazing include additional PVB layers for improved safety and security and tinted glass for better solar control and privacy.

Toughened double glazing

Toughened double glazing is made of two or more glass panes that have undergone a heating and cooling process to make it stronger and more durable.

The benefits of toughened double glazing include improved safety, reduced noise, and better insulation.

Potential upgrades for toughened double glazing include laminated glass for enhanced safety and security and Low-E coatings for better insulation and solar control.

Acoustic double glazing

Acoustic double glazing is designed to reduce noise transmission. This makes it an excellent option for homes and buildings located near busy roads or airports.

It typically consists of two or more glass panes with different thicknesses and laminated or toughened glass for enhanced noise reduction.

Potential upgrades for acoustic double glazing include thicker glass panes and additional layers of PVB or resin for even better noise reduction.

In terms of glass options, there are various types available, including:

  • Low-E glass has a special coating that reflects heat back into the room, making it an excellent option for energy efficiency
  • Tinted glass is coated with a film that reduces solar heat gain and improves privacy
  • Frosted glass is etched or sandblasted to provide privacy and light diffusion
  • Patterned glass has a decorative pattern that enhances the aesthetic appeal of windows while providing privacy
  • Self-cleaning glass has a special coating that breaks down dirt and grime, making it easier to clean

Useful double glazing checklist

  • Count the number of windows you want to install double glazing in
  • Speak to your local double glazing experts for professional advice and accurate quotes
  • Shop around for fair and competitive double glazing costs
  • Always hire a tradesperson with experience and relevant qualifications and/or accreditations
  • Check installers are FENSA approved
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Working with professional estimators, we collate cost estimates for the common home improvement and repair jobs in the UK.

All the costs are estimates only. For accurate costs for your particular requirements, you are encouraged to reach out to professional tradespeople to receive a quote for your job.

Our estimators are Chartered Members (MRICS) of the Royal Institution of Chartered Surveyors and Members of the Chartered Institute of Building (MCIOB). See full disclaimer.

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What others think of this article:

Jill Ivancic

Thank you. Your website gave me much more information and was more useful than any Australian website, which is where I live.

David Rimmer

Like a previous post, it’s good to get a range of costs without the usual prevarication on other sites. Thanks for the guidance


Very informative article - one of the very few that provide guideline prices which otherwise seem to be shrouded in secrecy!

Katie Aldridge

This is a very helpful article - thanks very much! Having not had double glazing replaced/ installed before, this was such a good starting point - thanks

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