Triple Glazing Guide And Costs

Triple glazing will reduce your energy bills whilst making your home warmer, safer and quieter.

The average cost for a 2 bedroom home is around £2,000. To install triple glazing in a 4 bedroom house with 15 windows you can expect to pay around £6,000 - £7,000.

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Triple Glazed Windows

what is triple glazing

Triple glazing works by securing three panes of glass within a sealed frame, instead of just one or two. Between the three panes of glass are very small gaps which are filled with either air or an insulating gas, such as argon.

The main selling point of triple glazing is that it enhances heat retention within your home. Up to 20% of heat loss occurs through your windows, since glass conducts heat fairly well. This means that heat can easily escape from your house if you have just one pane of glass in your windows. Triple glazed windows (and double glazed windows) aim to reduce heat loss with more panes of glass and layers of air or gas in between them. This makes it a lot harder for heat to escape, keeping your home warmer.

Triple glazing is most popular in cold climate countries such as Norway and Finland due to the extremely low temperatures they endure in winter months. Although double glazing is still the most popular in the UK, some homeowners are starting to switch to triple glazing due to the huge savings it can make on your energy bills, whilst making your property quieter and safer.

In this Guide to Triple Glazing:

Head straight to a specific section by clicking the links below.

How Much Does Triple Glazing Cost?

It is impossible to say exactly how much triple glazing will cost you without a survey of your home being carried out. However in general, triple glazing costs more than double glazing. For example, a double glazed window costing around £350 will set you back approximately £485 for exactly the same window with triple glazing. Of course prices will vary depending on the style, size and frame material of the window.

The table below provides you with an approximate price of how much it will cost you to install triple glazing into your home. The prices are based on average sized uPVC casement windows costing £485 each:

Property Type
Number of Bedrooms
Number of Windows
Typical Cost

Please be aware that the more windows you have installed, the cheaper each window will be. This means that the more windows you have installed, the more money you can save. It is therefore more cost effective to change all your windows to triple glazing, rather than just two or three.

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How Much Can You Save?

Fully renovating all windows in your house from single glazing to triple glazing could save a lot of money on your energy bills. A well insulated, detached house could save over £175 per year by replacing single glazed windows (or old double glazed windows) with triple glazing. This could work out at around a 50% saving on annual energy bills.

The table below shows you how much you can save per year on your energy bills by replacing old single glazing with triple glazing:

Energy Rating
Semi Detached
Mid Terrace
£135 - £175
£85 - £125
£75 - £100
£130 - £170
£85 - £120
£70 - £95
£120 - £160
£80 - £110
£65 - £90

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How Much Would Triple Glazing
Cost For Your Home?

What Are the Pros and Cons of Triple Glazing?

pros and cons of triple glazing


Can reduce heat loss in your house which can lower your energy bills

More efficient at heat retention than double glazing, making your home feel warmer

Less prone to condensation build-up between the panes than double glazing

It is harder to break, making your house more secure

The extra pane of glass blocks out more noise from outside than double glazing


High upfront costs, making it more expensive than double glazing

May reduce light penetration, allowing less light into the room

The extra pane of glass can make the windows very heavy and potentially damage your walls

Condensation can appear on the outer layer of glass

Long return on investment due to high initial costs

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Triple Glazing vs Double Glazing

triple glazed window

Double glazing is different to triple glazing in that it secures air or an insulating gas between two panes of glass instead of three, within a sealed frame.

If you already have new energy efficient double glazing, it is not worth switching to triple glazing. This is because you will only experience minimal improvements to the energy efficiency of your home. In this circumstance, installing triple glazing is a poor decision and you will not see a return on your investment.

However, if you have single glazing or double glazing with a low energy efficiency, triple glazing would be a worthwhile investment. This is because old or badly-made windows lose a large amount of heat. Changing to triple glazing will make your home feel noticeably warmer, whilst allowing you to save a considerable amount of money on your energy bills as you’ll use your central heating significantly less.

We do recommend that you also consider installing energy efficient double glazing, however. Double glazed windows offer similar benefits to triple glazed windows at a lower cost. Most well-known national window installers provide double glazed windows with an energy efficiency rating of A to A++.

You might also be interested in:

Which double glazed windows are best?

Triple Glazing Cost vs Double Glazing Cost

To give you an idea of the price difference between triple glazing and double glazing, we have created a handy table below showing the cost of different sized uPVC windows. Please note that these prices are based only on the cost of the windows, and exclude installation fees.

Size (mm)
Double Glazing Cost
Triple Glazing Cost
White uPVC
1660 x 992
White uPVC
1880 x 1061
White uPVC
2050 x 1133
Woodgrain uPVC
1660 x 992
Woodgrain uPVC
1880 x 1061
Woodgrain uPVC
2050 x 1133

Click here for more information on double glazing costs

How Much Would Triple Glazing
Cost For Your Home?

Is Triple Glazing Worth It?

If you live in a well-insulated house, triple glazing could be a good option for you, making your home warmer and more energy efficient. If you live in a noisy neighbourhood, triple glazed windows will help make your home quieter too. This is because the extra pane of glass helps to reduce the amount of noise entering your home from outside. For those concerned about safety, triple glazed windows are also extremely tough, improving the security of your home.

is triple glazing worth it

*Responses based on a survey we ran in May 2018 of 395 UK homeowners who've had triple glazed windows installed in the last 2 years.

However, triple glazing only makes sense as a financial investment if you are replacing single glazing or old double glazing. The image below shows a thermographic survey comparing old double glazing and new triple glazing. Red spots show where large amounts of heat are leaving the property. This demonstrates how triple glazing is much more energy efficient and reduces heat loss.

Triple Glazing Comparison Against Double Glazing

If you already have modern double glazing installed throughout your house, then triple glazing might not be the best investment. In this instance adding secondary glazing or thicker curtains may be a more financially viable way to reduce heat loss in your home.

Although triple glazing can make your home feel slightly warmer, new double glazing offers very similar benefits to triple glazing. If money is no issue or you are looking to completely maximize your energy efficiency to reduce your carbon footprint however, triple glazing is preferable.

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Which Companies Offer the Best Triple Glazing?

When installing triple glazed windows, most homeowners use a well-known national window installer such as Anglian or Everest. Using one of these companies will guarantee that your windows are of a high quality and are fitted by a team of experienced installers.

The table below provides you with information about the range of triple glazed windows provided by the leading national window installers in the UK:

Energy Rating
Name of Leading Product
A to A++
Anglian Triple PVCU
Everest Triple Glazed Casement
Zenith Eco Triple Casement Window

Bear in mind that many small local window installation companies offer high quality triple glazing - you do not need to use a national installer. You must make sure that you use one which is FENSA registered. FENSA is run by the Glass and Glazing Federation (GGF) and ensures that triple glazing installers comply with the building regulations set out by the UK government. This protects you from unauthorized or fraudulent installers, and guarantees you a high level of customer care.

We recently carried out a survey of 395 UK homeowners who've had triple glazed windows installed in their property in the last 2 years. Here's what they had to say about the different triple glazing companies:

% of Customers Who Felt Pressured to Sign a Contract
% of Customers Who Rated Their Installation as Good to Excellent
Local Installer

To get a personalised quote for triple glazing from a quality installer in your local area, simply click on the orange button below:

How Much Would Triple Glazing
Cost For Your Home?

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