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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

What’s The Cost of Triple Glazed Windows in 2024?

On average, triple glazing for a two-bedroom house costs around £7,860

Triple glazing will typically cost £21,825 for a four-bedroom house

It can save money on energy bills, block out noise, and provide greater security

Although higher than the cost of double glazing, triple glazing could save you from spending your winter shivering the nights away.

If your double glazed windows are showing a bit of wear and tear, they could actually be responsible for about 25–30% of heat loss (Energy.Gov, 2021).

Think double glazing might suit your property better? We can also help you with that. You can compare the best double glazing on the market by popping a few details about your home in our easy-to-use quote tool. We’ll pass on your details to our expert suppliers, who’ll get in touch with you with free quotes for you to compare.

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Triple glazing

How much does triple glazing cost?

Triple glazed windows costs 10% to 20% more than double glazing costs. The average price for triple glazing windows costs anything between £660 to £4,320 per window, according to Everest – one of the largest double glazing companies in the UK.

However, prices will always vary for windows – it all depends on what type, size, and style of window you’re choosing. For example, a triple glazed uPVC casement window will usually cost between £660 and £2,200, whereas a tilt-and-turn style will cost 25% more. And a triple glazed bay window costs an average of 150% times this.

Once you’ve settled on all of these deciding factors, it’s time to find a company that will provide you with an accurate quote.

Check out the table below for an overview of typical triple glazing costs to buy and install based on house size.

Property type
Number of bedrooms
Number of windows
Typical cost

Prices correct as of August 2023. Figures based on uPVC casement windows.

As you can see, triple glazing can be pretty expensive if you have a detached house with lots of windows to replace. If you’re set on this idea, you should know that the more triple glazed windows you install, the cheaper each window will be. In other words, in order to be cost effective, it’s better to have more windows installed, rather than fewer.

You can find out more about how double glazing compares by visiting our Double Glazing Cost page.

What’s the cost of triple glazing a three-bed house in the UK?

Replacing all the windows with triple glazing in a typical three-bedroom semi-detached property will cost homeowners roughly £13,120.  

To compare, installing double glazed windows in the average three-bedroom house in the UK will cost around £11,050.

However, both these figure will increase if you opt for pricier styles, such as bay windows, or use an expensive material like aluminium.

Triple glazing cost per m²

Triple glazing costs an average of £1,200 per m², according to Checkatrade. Window size will vary depending on the style you go for, but the average height of a uPVC window ranges from between 0.45 meters and 1.5 meters.

Triple glazing cost vs double glazing cost

We can praise triple glazed windows until the cows come home, but we know that one thing is at the forefront of everyone’s minds when it comes to making a purchase: the cost.

Everest states that triple glazing costs roughly 10% to 20% more than double glazing. So given that double glazing is already expensive, the extra cost might not be worth given that both types of windows have similar benefits.

To give you a rough idea of how much more you can expect to splash out, take a look at this table:

Frame material

Double glazing cost per window

Triple glazing cost per window










As you can see, triple glazed windows cost a little more than double glazing, but whether or not this overshadows the other benefits of triple glazing is up to you.

If you’d like to find out how much double glazing will cost you, simply fill out this short form, and our qualified installers will be in touch.

What type of double glazing do you need?

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Is triple glazing worth the extra cost?

For many homeowners, triple glazing isn’t worth that extra cost. 

Don’t get us wrong, it offers added insulation, extra security, and another buffer to noise outside compared to double glazing – but it’s you’ll be paying more for minimal benefits. 

The typical UK household will find that double glazing is enough for them – it has all the same benefits, but at a slightly cheaper cost. Plus, double glazing can increase the value of your property. 

Triple glazing might be worth it for people in particularly noisy areas, or homes that need substantial insulation to keep in the warmth.

You can read our full verdict by going to our page, Double Glazing vs Triple Glazing: Which Is Better?

What factors affect the cost of triple glazing?

There are a number of factors that can alter the price of your windows, including:

  • The type of window frame material – You can choose between uPVC, timber, and aluminium. If you’re on a budget, uPVC is the best way to go. While timber and aluminium are on the pricier side, they’re more aesthetically pleasing
  • The size and number of windows – This one’s pretty self-explanatory, but the more windows you need/the larger they are, the more materials will need to be sourced, which will push up the price
  • Location – Window installations tend to be more expensive in the south of the UK, especially in London
  • Access to the windows – The installer might need to put up some scaffolding to access the windows, which can cost between £1,000 to £1,300 for an average four-bedroom property

Are there any grants for triple glazing?

There are currently no grants for triple glazing, which is likely to be because they offer the same benefits as double glazing – they’re just slightly more effective at them.

There are, however, grants for double glazing available for some homeowners in the UK. The most flexible one is ECO4 – an extension of the government’s Energy Company Obligation (ECO) scheme – which has been running since April 2022 and ends in March 2026.

The main goal of this grant is to support low-income households by upgrading their homes to make them more cost efficient and environmentally friendly.

Want to find out which grants are available in your area? Check out our page on double glazing grants in the UK to find out more.

Triple glazing vs double glazing: which is better?

We’ve already established that triple glazing costs more than standard double glazed windows, but are there any other substantial differences between the two? The short answer, as you may have thought, is yes.

When it comes to thermal performance, triple glazing wins hands down. The energy efficiency of a window is measured by its U-value – the lower the number, the better. Double glazed windows are typically given a U-value of 1.6, whereas triple glazed windows are rated an impressive 0.8.

This means that by simply adding an extra level of insulation, triple glazed windows can provide you with even more warmth throughout the year.

And if you live on a particularly rowdy street, and find yourself struggling to sleep through the noise, triple glazing might be your saviour. By the time the sound wave gets through to the final pane of glass (if it gets through at all), it is much quieter and less noticeable than it would be with double or single glazed panes.

Plus, three layers of glass are much harder to break than two, making triple glazing a much better option if security is one of your priorities.

However, one drawback to triple glazing is that it tends to block out light. It’s much harder for light to penetrate that extra level of glass, which might cause your room to feel a little dimmer.

Whilst both double and triple glazing are excellent ways to insulate your home, triple glazed windows have the overall edge.

Double glazing
Triple glazing
Thermal performance
Sound insulation
Home security
Light penetration

Next steps

Whether you go for double glazing or triple glazing, you can be sure that installing this type of insulation will save you a penny on your bills. Don’t miss out on this window of opportunity.

If you’d like to upgrade to double glazed windows, request a quote, and our qualified installers will be in touch. It’s time to provide your home with an extra layer of warmth, protection, and soundproofing.


If you’re familiar with double glazing, then you’ll be pretty comfortable with its not-so-distant cousin, triple glazing. Triple glazing takes double glazing that extra step further, by simply adding another pane of glass to the window. This third pane of glass acts as an extra layer of insulation to your house, keeping you cosy during those bitter winter months.

Triple glazing is a bit like layering up before you brave the winter chill – except the insulation isn’t just coming from the extra layers. There is also a small gap between each of the three panes of glass, which is either filled with air or an insulating gas, such as argon. Argon is much heavier than air, which means it acts as a stronger barrier against any escaping heat.

This extra third layer also comes with other benefits, such as blocking out any outside noise, providing greater security, and adding value to your home (more on that later). But be careful, you’ll want to double check whether your walls can withstand the weight of triple glazed windows, as the extra layer can sometimes cause structural damage to walls.

As well as locking in heat, triple glazing also prevents heat from entering your home through the windows in the summer months. The G-Value of a window – which measures the amount of solar intake that the glass allows – tends to be lower for triple glazed windows. And the lower the number, the more effective the glazing is at controlling the temperature inside.

This is ideal for conservatories that tend to overheat in the summer, suffering from what experts in the field call ‘the greenhouse effect’.

With triple glazing, you’ll be able to significantly reduce the risk of getting window condensation. Since triple glazed windows have an extra pane of glass, they offer more insulation, and therefore reduce a build up of moisture around the window.
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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