How Much is Double Glazing?

Double glazing is the process of installing windows with two panels of glass with a layer of argon gas in between. This helps to increase insulation, making homes much more energy-efficient and reducing your heating costs.

Average Cost of Double Glazing

The average cost of double glazing will vary depending on the type of window you choose. For example, a fixed double glazed window will cost around £300 to £600, while a single casement window is normally priced at £400 to £700.

However, other styles include sliding windows which cost around £600 to £1300 and sash windows which range from £650 to £1200, while tilt and turn windows tend to be priced at £550 to £900. More expensive options such as skylight roof windows cost from £900 to £1200 while bay windows cost around £1350 to £2700.

Window Type Average Cost
Fixed Double glazed Window £300 to £600
Single Casement £400 to £700
Sliding £600 to £1300
Sash £650 to £1200
Tilt & Turn £550 to £900
Skylight £900 to £1200
Bay Window £1350 to £2700

Double Glazing Prices

There are several other costs you need to consider when calculating the final price for double glazing, including:

Colour Frames Double Glazing Costs

The above prices are based on typical white frames which are the most common options, however, there are other colours available which may work better with your interior and exterior.

Alternative colours are usually 10-20% more expensive than white frames which cost around £400, while a typical black or grey window cost around £500. If you would prefer a wood grain aesthetic, you should expect to pay up to£750.

Frame Type Average Cost
White Window Frame £300 to £500
Black Window Frame £400 to £700
Grey Window Frame £400 to £600
Wood Grain Effect Window Frame £600 to £800

Material of Frames Cost

Another important element you need to consider is the material cost of your window frames. The most affordable option is uPVC which range from £250 to £900 to install a typical casement window.

Aluminium frames are slightly more expensive, as they cost around £500 to £1000 Another popular choice is wooden window frames which are normally priced at £850 to £1500.

Frame Type Average Cost
uPVC Window Frame £250 to £900
Aluminium Window Frame £500 to £1000
Wooden Window Frame £850 to £1500

Tinted Double Glazing Costs

For increased privacy, you may want to consider installing tinted double glazing. It will also help to prevent too much light from entering your home, which will also help to regulate the temperature, as it will help prevent the sun from penetrating the window.

A popular option is anti-sun toughened glass which costs around £70 to £250 per square metre for a grey tint or £100 to £140 per square metre for a bronze tint.

Glass Costs

You could also consider upgrading your glass for extra protection, for example, you may want to purchase extra-strong material such as polycarbonate glass to prevent the glass from breaking, which is great for theft-prevention. This tends to cost around £30 to £160 extra per window.

If you live near a busy road, you may want to opt for noise proof glass, which will enable your home to become a more private and quiet space. Noise-proof glass windows are normally priced at £800 to £1900 for supply and installation.

What Are The Supply Costs of Double Glazing?

If you have a low budget that you want to stick to, then you may want to consider purchase double glazed windows yourself. To help you understand the costs, take a look at the following breakdown for different window types.


A fixed installation is a window that cannot be opened, and its only function is to allow light in and brighten up a home. Fixed double glazed windows tend to cost around £150 to £300 excluding installation.


A casement is a popular double glazing option which features a hinge on one side of the frame to allow it to open outwards. The supply cost for casement windows is around £250 to £400.


Sliding windows slide to one or more sides horizontally to open. If you wish to purchase sliding windows yourself, then you should expect to pay around £450 to £1000.


A sash window is similar to a sliding option, although it slides vertically rather than horizontally. The supply cost of a sash window is normally priced at £500 to £900.

Tilt & Turn

Tilt and turn windows are one of the most flexible options as they open like a normal casement window and can also be turned to angle into the room to help with ventilation. Tilt and turn windows range from £400 to £600.


A skylight is a type of roof window which is great for loft conversions and can also be fitted to improve lighting, ventilation and views. The supply cost for a skylight is around £750 to £900.

Bay Window

A bay window consists of three windows fitted together, which are usually located at the front of a property. Bay windows tend to range from £1200 to £2400.

Tradesmen Costs for Double Glazing

Another important cost you need to consider is labour and installation prices. These costs may vary depending on the job itself, as some windows are easier to install than others. For instance, smaller windows tend to cost around £150 for one window installer to fit it, while larger and more complicated double glazing installations cost up to £300 for a two-man job.

How many windows you need fitting will also determine the labour costs, as the more windows you have the longer the job will take. For example, a terraced home with four windows could cost around £180, while a three-bedroom semi-detached with eight windows may be priced at £250 for labour. Larger homes with twelve to eighteen windows may cost around £400 or more.

How Long Does It Take To Install Double Glazing?

The time frame for installing double glazing will also determine the final cost, as the longer the job takes the more you will pay.

The time frame will depend on the number of windows you need installing, for instance, if installing four windows in a terraced home this could take one day to complete, while a large three-bedroom semi-detached with eight windows or a four-bedroom detached home with twelve windows could take up to 2 days fit.

The style of the window will also determine the time frame, as small casement may only take an hour or two to fit, while a bay window or skylight could take a full day to install.

Type of Glazing Cost

Another factor you may need to consider is the type of glazing you want, as there are two different options to choose from, including:

Double Glazing Cost

Double glazing is the most common type of glazing which consists of two panes of glass with a layer of argon gas in between to improve insulation and energy-efficiency. The average cost of double glazing ranges from £300 to £2700 for uPVC double glazing window installation.

The extra layer of glass enables heat efficiency, as it prevents heat from escaping and cold getting inside your home. It also helps to reduce noise levels, which is beneficial for people living near noisy highways or busy city centres.

One of the main downsides of double glazing is the price, as costs can be quite extensive if you are planning to install numerous double glazed windows.

Secondary Glazing Cost

Secondary glazing is often confused for double glazing, however, there are numerous differences. Firstly, secondary glazing is just one layer of glass which is placed on the inside of your windows.

This is one of the most affordable glazing options, as it is much cheaper to buy, as the secondary glazing cost is around £300 to £350 per window. It is also a lot easier to install, so you can do it yourself and save on labour costs.

It also works the same as double glazing as it enables noise-reduction and also helps you save on your energy bills due to the lack of heat loss.

The problem with secondary glazing is that is normally used as a temporary option in comparison to double glazing or triple-glazing, so it may not be the cost-effective option in the long run.

Triple Glazing Cost

Triple-glazing is similar to the above options; however, it has the added benefit of a third pane of glass which increases efficiency by preventing extensive heat loss. It also improves noise levels and acts a great form of insulation, as it prevents hot and cold spots in your home.

Triple-glazing is slightly more expensive than the above options, as the triple glazing cost is usually around £400 to £550 per square metre. This may not be the most affordable choice; however, it can help you save in the long run on your energy bills.

In comparison to double glazing, it does not generate as much heat from the sun, which means you will not be able to harness as much solar energy which is the best form of natural light and heat.

Double Glazing Repair Costs

If you have had double glazing windows for a while, then you may start noticing some issues that may need to be repaired. Some of the most common double glazing repairs include:

Blown Window Cost

If you notice any fogging on your window that cannot be wiped off, the chances are your window is blown and the fog is forming in between the two layers of glass.

To repair your windows, you will need to call in a professional window fitter to remove the double glazing unit from its frame and replace it with a new one.

The cost of replacing misted double glazing units is around £40 to £150 to install, with prices depending on the size of the window.

Broken Hinges Cost

If your window is not opening or close as it normally does, then there may be a problem with the hinges. Instead of replacing your window, all you need to do is called up a window fitter to repair or replace your hinges, which will cost around £60 to £80.

Broken Handles Cost

If you have handles on your windows that are faulty or no longer working, then you may need to have them replaced. This can cost around £20 to £50 for supply and installation.

Glazing Maintenance Costs

A great way to ensure that your double glazed windows last, is by maintaining them regularly. This could include the following:

Resealing a Window Cost

If you notice any cold air coming through your window, then this could be a sign that your windows need resealing. You can do this yourself or hire a professional to do it for you which will cost around £50 to £90 per window.

Cleaning Cost

Cleaning your double glazing and window frames is so important to ensure that dirt does not build up and cause rot or unsightly mould. To clean uPVC windows, you should use a uPVC solvent cleaner which costs around £4 to £7 per bottle.

For wooden and aluminium windows, you should just use some washing up liquid on a soft brush and try to avoid using abrasive products.

When cleaning the double glazing itself, you should avoid using harsh chemicals and instead wipe away any dirt, then apply warm water and white vinegar to make your windows shine.

Lubricating a Window Cost

To prevent your window’s hinges from getting stiff you should try to lubricate them with a silicone spray regularly to ensure they open and close properly. You can purchase the spray from your local DIY store for £2 to £9.

Cost of Removing a Glazed Windows

If you want replacement double glazing, then you will need to have your existing glazed windows removed. Your best option is to hire a professional window fitter to take out your windows which will cost around £150 to £300 per day, so the final cost will depend on how many need taking out.

You may also need to hire a waste removal company who will charge around £70 to £160 to get rid of your windows. You can also do it yourself by taking it to a recycling centre, although you need to make sure that the glass is separate from the frame to ensure you recycle properly.


How long does double glazing last?

Double glazed windows tend to last for around 10 to 35 years, although this will depend on how well they are maintained.

The location of your windows will also determine the lifespan of double glazing, as certain areas may be more exposed to harsh weather such as wind, which may cause damage to double glazing over time.

How does double glazing work?

Double glazing consists of two panes of glass with a layer of argon gas in the middle. Argon gas is a poor heat conductor so by placing it in the middle it prevents any heat from escaping, resulting in energy-efficiency, which will also help to reduce energy bills.

Will double glazing reduce noise?

Double glazing does have noise cancelling properties, as the two panes of glass reduce the amount of noise that enters your home.

However, despite this, it is important to remember that double glazing is not completely soundproof, so you should be aware of any companies that use this a selling point.

When should you replace double glazing?

If you notice that your windows are steaming up, but you cannot remove the condensation due to it being inside the windowpane, it may be time to have your double glazing units replaced.

You may need to replace the entire window if there are further problems with the seal or frame, as this will prevent new double glazing from being effective.

Can double glazed windows crack?

Double glazing is made up of extremely robust materials, so the chances of it cracking are slim. However, this does not mean that double glazing is immune to cracking, especially if you have had it for a while.

It may crack due to extensive weather conditions, especially if you have any scratches as this will make the glass more vulnerable and weaker. Excessive temperatures and humidity also have an effect especially in rooms like the kitchen or bathroom where condensation is at a high level.


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Author: Heather B

I am a seasoned copywriter from Liverpool - who after graduating with a BA (Hons) degree in English Media and Cultural Studies - went on to specialise in the creation of business and lifestyle copy for a wide range of industries across the UK and USA.