Triple glazing: cost breakdown 2026

Want to keep your home warmer and cut down on heat loss through your windows? Triple-glazed windows might be the answer. Read on for the key factors to consider, typical costs, and how they compare to double glazing in price.

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Triple glazing is fast growing in popularity, and it's easy to see why. That extra layer of insulation can make all the difference to help reduce heat loss in your home and, in turn, your energy bills. It's also great for soundproofing.

While a triple glazed window will cost £1,200 on average, prices start to climb for larger windows. The same goes for more premium frame materials, like aluminium and timber.

Keep reading for a full triple glazing cost breakdown.

How much does triple glazing cost in 2026?

Triple glazed windows are effectively an upgrade from double-glazing. They are constructed from three panes of glass filled with argon to create two sealed cavities rather than one.

But as you can see from the table below, with that extra pane and cavity comes a higher price-tag.

Calculating the cost of a triple glazed window

New windows are a long-lasting investment in your home. That's why it's crucial to consider all the costs wisely. Let's look at the cost of triple glazed windows in closer detail:

Triple glazed window cost by size

uPVC triple-glazed windows are the cheapest and most popular type installed. For that reason, we've focused on uPVC styles when comparing cost per window size in the table below.

Triple glazed window cost by frame material

The window size isn’t the only factor impacting the price of your triple-glazed window. The type of material also has a bearing. Let’s consider the most common materials used in the manufacture of triple glazed windows – uPVC, aluminium and timber:

uPVC

Strong, lightweight, and low-maintenance, uPVC has come a long way since the early ’80s, when it was first used for window frames. Nowadays, you can choose from a huge variety of finishes and colours.

It's also one of the most easier on the wallet materials you can choose for triple-glazed windows, with prices for supply and install starting at around £1,200 per window.

Aluminium

Aluminium windows are durable and have a sleek, designer finish, but they come at a price. Expect to pay at least 25% more for aluminium vs uPVC windows.

As a ballpark figure, the average cost to supply and install a triple glazed aluminium window is £1,500

Check out our aluminium vc uPVC windows cost guide for more information.

Timber

Wooden window frames add a beautiful, natural look to your home and can even increase its saleability. But they will cost you.

With the average cost of a triple-glazed timber window averaging £1,800 for the supply and install, it doesn't take a mathematician to work out that costs will soon mount up!

Cost of triple glazing by house size

If your budget allows, upgrading all the windows in your home in one go is worthwhile. You'll get a better rate than paying for upgrades piecemeal, room by room.

Let's look at the cost of a full-house triple glazing job, including the price of supplying the windows and the installation.

Terrace house (5 windows)

If you're looking to buy and install triple glazed windows for a terraced house with five windows, it will cost around £6,000.

Semi-detached house (8 windows)

Upgrading to triple glazed windows in a semi-detached house with eight windows will cost roughly £9,600. Remember, this cost includes both the windows themselves and the installation.

Detached home (12 windows)

Own a larger home with 12 windows? You could expect to pay around £14,400 for the entire job.

Every Checkatrade job is backed by our £1,000 guarantee

Up to £1000. Eligibility criteria and T&C’s apply.

What affects triple glazed window costs

While the size of your property and type of window you go with will determine the baseline costs, additional factors may increase the amount charged by window fitters. This includes:

Home location

Contractors in London and big cities will inevitably charge more to reflect the demand.

The average cost to supply and install a uPVC casement window in London could be around £1,300. This is compared to the national average of £1,200 .

Window size and style

uPVC casement style triple glazed windows are generally priced between £700 - £2,200. If you prefer to have a window with one opener, the material cost will typically be between £800 - £2,400.

Unsure what style of window to choose? Our buying guide has lots more information about the types of windows available.

Frame material

As explored above, the type of material you choose for your windows can greatly affect your triple glazed windows price.

uPVC white windows are the cheapest, at around £1,200 per window. However, it's worth noting that coloured uPVC window prices are around 10%-20% more than the regular white frames.

Meanwhile, for timber windows, you'll need to up your budget to£1,800 per frame.

Glass specification

It's worth noting that the costs covered here are for standard triple glazed glass. If you're looking to add special filters or treatments, such as tinting for privacy, you'll need to factor in more for this.

For instance, some homeowners push the boat out on a low-emissivity (Low-E) coating. This helps reduce solar heat gain and improve privacy, but it will cost more. Look to pay £1,300 per window for this add-on feature.

Installation complexity

Sometimes, scaffolding is required to access windows. Always check with your window installer whether this is included in your final quote.

To give you a general steer, a scaffold tower hire costs approximately £250 per week. Our scaffolding cost guide has plenty more information about the costs involved.

Energy efficiency rating

Building regulations require replacement windows to achieve a U-value of 1.4 W/m²k to reduce carbon emissions.

However, if you're looking to improve your energy efficiency even more, you'll want your window glazing to have an energy rating of A+ or higher.

From tips and tricks to help lower your bills and your carbon footprint, to finding out about the latest government grants, our Green Hub has all the details.

Hidden costs of triple glazing to watch out for

Some factors, like the cost to remove your old windows, can easily get forgotten. Here's a roundup of hidden costs to be aware of.

Waste removal

If you need your old windows to be removed, check with your window installer if waste removal is included in their quote.

If you do need to hire a skip to get rid of your old windows, budget between £125 - £320 per week, depending on the size required.

Plastering

Finally, ask whether the quote includes tidying up any plasterwork or timber around the new window once it's installed.

If not, it's handy to know plasterers tend to charge around £35 to £40 per hour.

Find plastering services and plasterers near me

If you’re renovating your home, there's a good chance you may need to find and hire a plasterer near you. Well, we're here to help! In this guide, we’ll explore everything related to hiring a plasterer near you - from what jobs they can help you with to how much they cost to hire. How do I find an

Learn more

Benefits of triple glazing

Triple glazed windows are thought to be 30% more thermally efficient than "A" rated double-glazing. So, investing in this early could help you to add value to your property. Other benefits of triple glazing include:

• Lower energy bills

• Reduced condensation

• Improved security

• A warmer home in winter

• Reduced noise pollution

• Savings to be made with green grants (if you currently have single glazing)

Triple glazing vs double glazing costs

A triple-glazed window will cost £1,200 on average. By comparison, a window with double glazing costs approximately £1,000.

However, upgrading to triple glazing will always be a worthwhile investment. For example, if you own a detached house with single glazed windows, switching to triple glazing could result in around £200 cost savings on your energy bills per year.

Still unsure whether triple glazing is right for your home? Read our blog on the pros, cons, and additional considerations of double and triple glazing.

Or, for an accurate quote, contact a certified installer. They will visit your property, discuss your requirements, and provide a detailed cost breakdown.

Find a certified installer for your triple glazed windows

Finding a certified tradesperson recognised with a Competent Person Schemes FENSA or CERTASS is easy with Checkatrade. Just follow one of these three easy steps:

1. Use a trade directory

Even if you find a tradesperson elsewhere, running a quick Checkatrade search can boost that ‘yep, I’ve nailed it’ feeling.

Plus, if you contact or pay a tradesperson through Checkatrade, and meet our eligibility requirements, you’re covered by our 12-month guarantee of up to £1,000 (T&Cs apply). That’s extra protection you can rely on.

2. Read online reviews

A review from a previous customer is one of the best ways to check a tradesperson's experience and suitability.

Use Checkatrade for peace of mind, read real reviews and get in touch with tradespeople directly using our free search tool.

We check the reviews on Checkatrade are from real people, and that trades meet our high standards.

3. Compare quotes

Get at least three quotes from experienced glaziers covering your local area. That way, you can be sure you're getting the best tradesperson and price for the job. Search your postcode to get started.

FAQs

What is the average triple glazing cost per square metre?

Costs will vary depending on the size of the window. For this reason, some suppliers provide a triple glazing cost per square metre. In the UK, the average cost per m² tends to be around £1,200.

What is the average triple glazing cost per window?

A triple glazed window will cost £1,200 on average. By comparison, the cost of a window with double glazing costs approximately £1,000.

Can triple glazing help reduce energy bills?

If your home has single glazed windows or older double glazed units, upgrading to triple glazing can save on energy bills. For example, if you own a detached house with single glazed windows, switching to triple glazing could result in around £200 savings on your energy bills annually.

Can I install triple glazing myself?

While it is possible to fit new triple glazed windows yourself, the smallest mistakes can lead to heat loss. This ultimately defeats the point of investing in them in the first place.

Make sure your triple glazed windows are sealed and fitted correctly by hiring a glazier who knows what they're doing - particularly if you plan to replace all the windows in your home.

Search your postcode today to find checked and reviewed installers with Checkatrade and help your home stay warmer for longer with energy-efficient triple glazing.

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