Double Glazing Cost

Double glazing costs are generally not that well known. If you asked 10 random people how much their installation was, you would probably get 10 different answers. This is because there’s a multitude of variations which can affect the price.

This can seem a little intimidating, but fear not, as in this article we will discuss the different types of windows available, installation choices and much more. So read on and let us guide you through the required information and help you to reduce your own double glazing costs.

What can affect the cost of double glazing?

There are a multitude of factors that can affect the cost of your double glazing. Everything from the type of window (fixed, casement, sliding, etc.) to the type of frame (uPVC, aluminium, wooden) and even the type of glass.

Let’s start by taking a closer look at the types of double glazing frames available and their relative prices.

PVC Windows

uPVC double glazed windows are amongst the most popular and have been for more than three decades. They offer good thermal efficiency (especially with some brands manufacturing A+ rated frames), low maintenance and high durability with good resistance to rot.

uPVC double glazed windows are secure, even more so if fitted with good quality locks, and provide good soundproofing.

While uPVC windows may not be as aesthetically pleasing to someone looking for the special touch to their property that timber frames can give, they are available in numerous colours and typically are a casement window style.

If we add to these attributes the relatively lost cost of uPVC double glazing, it’s easy to see why they are so popular.

How much does uPVC double glazing cost?

So, let’s get down to prices. As already stated above, uPVC windows are generally the cheapest option available yet still offer great value for money.

Below is a brief chart showing accurately estimated uPVC double glazing costs. The window prices shown are fully inclusive of installation and VAT.

uPVC Double Glazing Cost
Material Size (width * height mm) Openers Cost
uPVC 600 * 1200 1 £250-£350
1200 * 1200 1 £300-£400
1200 * 1200 2 £350-£450
1800 * 1200 1 £350-£450
1800 * 1200 2 £400-£500
1800 * 1200 3 £450-£650
2400 * 1200 1 £400-£500
2400 * 1200 2 £450-£650
2400 * 1200 3 £500-£700
2400 * 1200 4 £550-£750

As you can see from the easy to read chart above, windows generally come in the following sizes :

  • 600 x 1200mm
  • 1200 x 1200mm
  • 1800 x 1200mm
  • 2400 x 1200mm

I’m sure you’ve noticed that the typical height is 1200mm and that the widths shown are multiples of 600. As a rule of thumb, one window section is 600mm wide. Easy to remember isn’t it?

So, if we look at the chart again, we can see that a single section window fully installed should cost between £250 – £350.

It’s far more common, however, for house windows to be in multiple sections and this brings in the addition of the number of openable sections when calculating the cost of your double glazed windows.

For example, the price of a two section uPVC window measuring 1200 x 1200mm with one opening section would be £300-£400. Making both sections openers should increase the cost by about £50. At the far end of the scale, the installation of a large multi-section window (2400 x 1200mm), like a bay window, where all sections can be opened, should be in the price range of £550-£750.

So to sum up, let’s say you have a house with 6×2 section windows and you want to change all the windows in your home to be uPVC double glazing. The overall cost would be around £1800-£2700 depending on your choices.

Now let’s take a look at the pros and cons of aluminium frames and their prices.

Pros and Cons of Aluminium

In recent years aluminium framed windows have grown in popularity. When customers opt for aluminium frames over uPVC it is often due to two things: aesthetics and extra durability.

Many home owners find aluminium frames more pleasing to the eye than uPVC ones. They have a sleeker look and a more slender profile which some find more preferable to uPVC’s bulkier frames. More slender frames also allow in more natural light and give better ‘sightlines’.

Durability wise, aluminium is excellent. These windows require very little maintenance and will remain rust free for their lifespan which could be up to 45 years! Comparatively, even the highest quality uPVC windows may need to be replaced after 20-30 years.

In respects to security and soundproofing, aluminium frames are pretty much on par with their uPVC counterparts, but as we said they are much sleeker in design.

In the past, aluminium double glazed windows were thought to be less energy efficient than other types because of the material’s conductivity. However much has changed and with advances in technology, it’s now easy to find thermally efficient aluminium window frames.

Aluminium Double Glazing Cost

We’ve already established that uPVC double glazing is the lowest on the price scale. Aluminium windows are the next step up in expense while still remaining competitive. Here we will attempt to spread some light on the cost of aluminium double glazing but please be aware that these estimated prices are for regular shaped and sized windows and any customization and variations will almost definitely be more expensive.

Aluminum Double Glazing Cost
Material Size (width * height mm) Openers Cost
Aluminum 600 * 1200 1 £450-£650
1200 * 1200 1 £600-£900
1200 * 1200 2 £650-£950
1800 * 1200 1 £650-£950
1800 * 1200 2 £700-£1000
1800 * 1200 3 £750-£1050
2400 * 1200 1 £750-£1050
2400 * 1200 2 £800-£1100
2400 * 1200 3 £850-£1150
2400 * 1200 4 £900-£1200

Take a look at the price table above. You will see that the lowest priced window is a single section, single opener with a standard size of 600 x 1200mm and an estimated cost of between £450 and £650. If we compare this with the same type of window in uPVC, we see that the cost of aluminium double glazing is roughly 80% more expensive.

So if we talk the same hypothetical house as before and again change all 6 windows but this time to aluminium double glazing, the total cost would be between £3600 and £5400.

Timber Frames

If you’re looking to giving your home an impressive outer face, timber window frames are a great choice. They have a classic, aesthetic value which is hard to beat, especially on older properties and homes with brickwork. For some listed properties, timber is the only sensible choice.

Wooden windows are also highly customisable, they can be easily carved for decorative purposes and painted in any colour the customer desires.

When it comes to energy efficiency, timber frames are number 1. This is due to wood being a great thermal insulator, far more so than either aluminium or uPVC. Wooden frames don’t just make your house look warm, they actually contribute to keeping your house heated in those cold, winter months. In summer, they do the opposite! Not allowing the heat from outside to pass through into the property. A win-win situation indeed.

With climate change in the forefront of a lot of people’s minds these days, timber windows offer the ‘greenest’ option for several reasons. Their thermal insulating properties reduce the need for excessive heating from inner sources such as central heating systems or fireplaces. In addition, they don’t release CO2 into the atmosphere like other materials and on top of that, wood is also biodegradable and recyclable.

While the cost of timber frames is higher then both uPVC and aluminium, with correct maintenance, such as regularly repainting or applying wood stain, wooden windows can be extremely durable and outlast both of the other materials.

If you live near a busy main road or an area with a lot of foot traffic, high quality, timber frames can add some well needed soundproofing to your home, especially some brands which are a combination of different woods.

Speaking of different woods, double glazing frames come in a variety of both hardwoods such as oak or beech and softwoods such as cedar and pine.

So which is better for windows? Hardwood is more expensive but offers greater durability, it is stronger, offering better security, and more fire resistant.

Softwood is cheaper as softwood trees grow faster than hardwood trees. Softwood window frames still offer a great look, but as already mentioned, they don’t last as long.

There are some things to think about tough when considering timber frames for your double glazing. Insects such as termites need to be checked for as well as weather damage. They also need to be properly maintained in order for you to benefit from their long life.

So, with all these benefits, it’s easy to see why the cost of timber double glazing is higher than uPVC and aluminium, but how much more exactly? Let’s take a look-

How much does timber double glazing cost?

Here we will take a look at the cost of timber double glazing, both hardwood and softwood, and also, to get a clearer overall idea, compare it to uPVC and aluminium double glazing prices. Let’s start by taking a look at the following tables-

Timber: Hardwood Double Glazing Cost
Material Size (width * height mm) Openers Cost
Timber: Hardwood 600 * 1200 1 £900-£1200
1200 * 1200 1 £1200-£1500
1200 * 1200 2 £1300-£1600
1800 * 1200 1 £1300-£1600
1800 * 1200 2 £1400-£1700
1800 * 1200 3 £1500-£1800
2400 * 1200 1 £1500-£1800
2400 * 1200 2 £1600-£1900
2400 * 1200 3 £1700-£2100
2400 * 1200 4 £1800-£2300
Timber: Softwood Double Glazing Cost
Material Size (width * height mm) Openers Cost
Timber: Softwood 600 * 1200 1 £700-£1000
1200 * 1200 1 £950-£1250
1200 * 1200 2 £1050-£1300
1800 * 1200 1 £1000-£1250
1800 * 1200 2 £1100-£1400
1800 * 1200 3 £1200-£1500
2400 * 1200 1 £1200-£1500
2400 * 1200 2 £1300-£1600
2400 * 1200 3 £1400-£1800
2400 * 1200 4 £1500-£2000

As with previous sections on uPVC and aluminium costs we will talk about the prices shown in these tables, which are based on the most common window sizes. Again, please bear in mind that any customisations such as carvings, special casings, unique shapes or special glass will obviously affect the price of your installation.

Once more we will start with the smallest size in the table- a single section, single opener window (600x1200mm). The installation of a hardwood window of this size is priced between £900 and £1200. The exact same window with a softwood frame would cost roughly £200 cheaper. If we look at the other window sizes in the table we can see that this price difference remains the same throughout the range. For example a large 2400x1200mm window with 4 openers would cost £1800-£2300 in hardwood and £1500-£2000 in softwood.

Now once again, let’s take our imaginary house with 6×2 section windows and put the prices for the four types of frame side by side so you can see the difference in cost for yourself.

  • Hardwood £7200-£9000
  • Softwood £5700-£7500
  • Aluminium £3600-£5400
  • uPVC £1800-£2700

As you can see, the prices vary massively. So there isn’t a clear cut answer to the question ‘How much does double glazing cost?’ It all depends on the wants and needs of the customer.

Next we will investigate ways to save money on your window installation.

How can I reduce the cost of my double glazing?

Let’s be honest, we are all looking for ways to save and a great way to reduce your double glazing costs is with supply only windows. Supply only windows are just that- the windows are supplied and delivered to the customer but installation is undertaken by the customer themselves. This is option is perfect for those customers who are confident in their DIY skills or those who have friends or family that can do the installation for them.

Please be aware that if you are planning on self-installation, there are regulations that need to be adhered to to such as ‘part L’ which refers to fuel and energy conservation, ‘A1’ which refers to the structure above the windows, and others.

How much will supply only windows reduce my double glazing costs?

Should you choose do go down the self-installation route, you can expect to save approximately 30% on the costs shown in the tables on this page. For example a supply only, 1200x1200mm hardwood window with 2 openers should cost around £910-£1120 rather than the full installation price of £1300-£1600.

Next we will take a look at a selection of properties and do a short case study on the savings that could be made with supply only windows.

Property 1

This property is a semi-detached house with 4 front facing windows. The bottom one is a 3 section window at approximately 2400x1200mm with 3 openers, the other 3 windows are 2 section, 1200x1200mm with one opener.

If you were looking to get high quality uPVC windows professionally installed in this particular property, you would be looking a price of around £1400 to £1600.

On the other hand, if you were happy breaking out your toolbox and tackling the installation yourself, you could reduce the total cost of your double glazing by £400-£500. Let’s imagine the rear of the house is similar to the front and you’re going to save close to £1000. Of course with self-installation there’s the time and energy cost to consider but it is still an attractive option for some customers.

Property 2


Time to take a look at another property. We can see the front and rear of this one. This home has uPVC frames fitted in all 7 windows but let’s imagine that the owner isn’t happy with the bulky frames and wants to have them replaced with aluminium ones in order to improve the profile of the house and let more natural light in.

There are 3 single section 1200×1200 windows with single openers, 3 1800×600 windows, again with single openers, and a large 3 section 2400×1200 downstairs window with 2 openers. I’m sure you’re getting used to these prices by now. If you’d like, you can look at the tables from earlier and see if you can work out the total expense for this property?

If you read the tables correctly you have seen that the overall installation cost for aluminium double glazing in this property would be around £4550 at the lower end of the scale and £6650 at the top end.

If the owner decided on supply only windows, his total double glazing costs would be somewhere between £3185 and £4655, saving him around £2000.

Property 3

As you can see from the picture above, our third property is a large detached house with several large plastic windows.

For this impressive house, timber frames would be an ideal choice as they would only add to the already pleasing aesthetic value and also help to reduce the heating costs of such a large property.

We can see that the lower level of the house has 2 large bay windows measuring 2400x1200mm, a smaller bay window at approximately 1800x1200mm and at either side of the front door there are 2 more 2400x1200mm windows albeit rotated so they are taller than wide.

Again, On the upper level, we can see a couple of 2400×1200 windows, one 1200x1200mm between them, and on the far right a 1800x1200mm frame. Let’s assume that the larger windows have 3 openers, the medium sized window 2 openers and the smallest window is a single.

If the owner opted to have these current frames professionally installed with hardwood, he should expect the overall cost to double glaze the front of his house to be in the range of £14200-£17500.

Softwood frames would be a cheaper timber option and still offer amazing looking windows at about £11550-£14850, bringing the price of his timber double glazing down by approximately £3000.

Self-installation for a property this size, with this many windows, would certainly be very time consuming but would probably save the owner around £5000 on hardwood installation and £3000-£4000 on softwood. That’s a fair saving if you’re willing to put the time and effort in.

We hope that this brief study has shed a little light on the supply only option.

Do you need to use a double glazing cost calculator?

The short answer is no, you don’t. Even though a lot of websites now feature a double glazing cost calculator, they really aren’t necessary for you to work out the cost of your double glazing installation.

Already in this article, we have looked at clear, easy to understand tables showing the prices for all standard sizes of windows in uPVC, aluminium and timber and shown how easy it is to calculate your own double glazing costs.

On this site, you will find informative articles covering everything you need to know about windows and their installation. Each article has a relevant pricing table that it refers to, covering every single permutation imaginable, making a double glazing cost calculator quite unnecessary.

Here’s another example taken from our piece on sash windows-


As you can see, all the relevant information is presented in an easy to understand fashion, with the types of frame material in the first column, window sizes in the next column and finally the estimated price range. If you explore this site, you will not only find pricing tables for all your needs but also detailed, useful articles to help you make the choices that are right for you.

It’s not that we are saying sash windows double glazing cost calculators are a bad thing, it’s just our belief that reading our articles and charts will give you a more informed overview of your pricing options.

We believe that we provided clear cost information for nearly all variations, but if you have something special in mind that our precise charts don’t quite cover, we would love to discuss it with you. Please feel free to contact us by email or phone.

Misted Double glazing units

If you already have double glazing installed in your home but have begun to notice that the glass appears misted or cloudy and no matter what you try you can’t clean it off, chances are you have condensation trapped between the panes.

Double glazed windows are constructed of 2 panes of glass with a space between them that acts as an insulation blanket. This is then all sealed off around the edges as a prevention measure against moisture getting trapped inside. However, these seals can degrade over time (surprisingly quickly if dealing with low quality windows) and moisture can get in and cause condensation that mists up your windows.

Cheap, low quality uPVC frames can also deteriorate and crack and this will also allow warm air from inside the house to come into contact with the colder air inside the frames and cause condensation. The result is unsightly looking windows rather than beautifully clear panes of glass.

In addition to the misting, if left unresolved, the moisture can leak down and through to the wall, possibly causing problems with mould, it’s definitely worth looking into double glazing repairs.

Broken seals also mean that your home is most likely losing heat and causing an increase in your energy bills.

However, fear not, as in many cases the problem can fixed fairly easily and relatively cheaply.

Replacing misted double glazing units

If the frames of your windows are still ok and the problem lies only with the double glazing unit, then you might be surprised at how inexpensive the repairs may be as you’ll only have to replace the sealed units.

Replacing misted double glazing units is fairly straight forward but is still a task best undertaken by professional glazers as attempting a DIY replacement could lead to even more problems not mention potential injuries.

The process is simple enough, first the window trim is carefully removed using a sharp tool such as a chisel, then the panes of glass are removed (attempting this yourself is not recommended unless you have experience) and the insides of the frames are checked thoroughly and any debris and dust is cleaned out. The new glazing unit is then placed back into the frame, making sure that it is completely square and aligned properly, and finally the trims are placed back, clicked into place and stuck down with glazers tape. The refitting of the trim can sometimes be a bit of a challenge and requires just the right amount of pressure being applied to be manoeuvred into place without damaging it. The new glass is then cleaned thoroughly, leaving you with crystal clear views out of your new windows.

The cost of replacing misted double glazing units

So, now we know the reasons for misted windows and the process of replacing them, let’s discuss the price.

Again there are many variables to take into account here such as size and specification.

Obviously, the bigger the window the higher the price but we also have to take into account other things such as the type of glass.

You might want to have special glass that is more energy efficient to help reduce your heating costs or maybe opt for toughened glass which, on average, would increase costs by about £100-£150 per window. Acoustic glass is sometimes preferred in noisy areas as they are designed to weaken sound waves. There is also fire glass, coloured glass for decoration and even self-cleaning glass which, with the aid of special coating, breaks down dirt and spreads rainwater around the window evenly.

Like I said, so many different specifications that alter the cost, but generally you should expect to pay somewhere in the price range of £150 to £500 for a professionally replaced double glazing unit. A huge saving if compared to the cost of replacing the frames and the windows. Some windows are always worth saving, Tilt and turn windows lean in so it’s far less dangerous. Of course, never do this alone, always seek the help of a professional, you should be careful when handling glass and unless competent at DIY stay well clear, you run the risk of injuring yourself and others.

These days it is also possible to have your misted widows removed, cleaned and then reinserted back into the frames, saving you even more money. This process isn’t always viable though and is sometimes only a short term fix, so if you’re having issues with misted double glazing, we suggest getting a professional to come and inspect it and they can talk you through your options.

Well, that brings us to the end of this article on double glazing costs. We hope that it has been presented thoroughly enough so that you now feel more confident selecting the type of windows and installation that best suits your needs. We have tried to present the information as clearly as possible but if you still have any inquiries, our trained professionals are waiting to help you with them by either phone or email.