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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

Aluminium Window Costs 2024

The average cost of double glazed aluminium window is £475

Aluminium windows can reduce your energy bills by up to £195 a year

Fill in the form above to receive bespoke quotes for aluminium windows

They say that eyes are the windows to your soul, which must make windows the eyes of your house. It’s important to keep your house’s eyes looking as healthy and beautiful as possible, otherwise your whole home will suffer.

Welcome to the era of “Big Glass”. Fashions change, and in the same way that glasses frames have got thinner and thinner, thick window frames are a thing of the past. People want less frame and more glass, which means more daylight, more Vitamin D, and more happiness. It really is that simple.

This spells the end for bulky timber and chunky PVC. Wood is traditional but it’s also prone to rot, while plastic is practical but rather unattractive. Enter: aluminium, here to offer you the best of both worlds. It’s sleek, modern, ultra-durable, and its 100% recyclability means it ticks the eco-friendly box.

Here’s everything you need to know about going metal – or simply complete this form to get free personalised quotes for aluminium windows.

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What’s on this page?


How much do aluminium windows cost?

Double glazing costs vary but, on average, you can expect aluminium windows in the UK to cost roughly £475. However, you should bear in mind that this will vary, depending on the size and type of window you go for. 

For example, an aluminium casement window with two panes (measuring 1000mm x 1000mm in total) will typically cost about £540–£960. Meanwhile, sash windows are more expensive, with prices going up to around £1,200–£1,500.

Check out the table below for the average cost of multiple aluminium casement windows. Please uses these price estimates as an indication only.

Window size (mm)
Price range
600 x 900
£540 – £680
900 x 1200
£650 – £800
900 x 1200
£770 – £960

To receive bespoke quotes for aluminium windows, fill in this form, and our professional suppliers will get back to you.

Do coloured aluminium windows cost more?

If you want to jazz up your new aluminium windows with a bit of colour, we don’t blame you. You have the right to be fabulous.

Upgrading from standard white aluminium to something a bit more interesting will usually cost around 10-15% extra. The aluminium is powder coated with one of the colours from the RAL colour chart, offering more than 200 different options.

The most popular colour for aluminium windows is RAL 7016, otherwise known as Anthracite Grey, which you will have seen everywhere. If you can’t choose a colour for your windows, just plump for 7016; it’s classy and it goes with pretty much everything.

If you’d like a glance at the RAL chart, head here. You’ll notice an array of unique shades, such as the lovely Mellon Yellow, the gorgeous Olive Drab, the inspiring Concrete Grey, the tasteful Luminous Bright Red, and the unmistakable Pigeon Blue, perfect for your pigeon-coloured house.

You might also be interested in our Double Glazing Cost page.


Pros and cons of aluminium windows

So what’s all the fuss about? Read these key benefits of aluminium windows and you’ll realise the fuss is very necessary. We also dispel the supposed ‘disadvantages’ of aluminium windows and silence the haters.

Advantages of aluminium windows

It’s cheaper than timber. While aluminium is generally more expensive than PVC, it’s also much more affordable than timber. This is a no-brainer, considering aluminium is tougher and more durable than wooden double glazed windows. Plus, you can use a woodgrain foil to simulate the appearance of timber. The resemblance is uncanny.

The frames are thinner. Aluminium has a phenomenal amount of inner strength, although it doesn’t like to talk about it. This means it can be slender and still offer the same support as a bulky chunk of timber or PVC, allowing more space for glass. Not only does this give you a better view of the great outdoors, but glass is a very talented insulator, so you’ll lose less heat (and save on the bills).

It lasts a long time. During spells of icy cold and intense heat, many window frames contract and expand, slowly losing their shape and eventually needing to be replaced. In particular, PVC loves warping in the sunlight, and wood can’t wait to start rotting. On the other hand, aluminium remains strong and stable, typically lasting around 25-30 years (or longer). Maintenance is minimal.

You’ll be better protected. This inner strength comes with one more advantage; aluminium will be your guardian angel. Its natural robustness means it can withstand attacks far better than wood or plastic, so you can rest easy in your metal fortress.

It will jazz up your home. We’ve already mentioned the 200+ RAL colours you can have your frames in, with some companies even offering an interior-exterior dual-colour option. What’s more, aluminium can be shaped exactly how you want it, so you can finally have your dream octagonal windows.

It’s eco-friendly. Aluminium is 100% recyclable, so when you’re finally ready to get rid of your metal friends, they will be ready to go all over again.

Disadvantages of aluminium windows

A poor insulator? It used to be the case that aluminium was one of the worst materials for keeping the heat in, but polyamide thermal breaks (that go between the internal and external layers of aluminium) have helped to deal with that. “Thermally broken” aluminium windows can now compete with high-end PVC and timber equivalents.

Prone to condensation? Again, thermal break technology has put this one to bed.

Weak soundproofing? If keeping the world’s noise out (and your noise in) is a priority, PVC frames tend to be a bit more effective. However, it’s worth noting that the majority of a window’s soundproofing is determined by the glass, not the frame. Get good quality double glazing and your house will feel like a library.

Susceptible to salt corrosion? Aluminium just hates the seaside, it’s true. If your windows are near sea air and saltwater, the frames will start to corrode, but there are easy ways to prevent this. For instance, regular cleaning will keep the salt away, and a lick of powder-coated paint will add an extra layer of protection.


  • It’s cheaper than timber
  • The frames are thinner
  • It lasts a long time
  • You’ll be better protected
  • It will jazz up your home
  • It’s eco-friendly


  • A poor insulator?
  • Prone to condensation?
  • Weak soundproofing?
  • Susceptible to salt corrosion?

What type of double glazing do you need?

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Are aluminium windows suitable for your home?

Once upon a time, aluminium windows were found only in commercial buildings like supermarkets and big offices. The modern metal vibes weren’t really something that people wanted in their homely homes.

Fortunately, aluminium has bucked its ideas up and become much more adaptable. If your home is old and traditional, simply add a woodgrain foil to your aluminium windows and nobody will know the difference. “I can’t believe it’s not wood!”, your jealous friends will exclaim.

If you’re blessed enough to live in a listed building, it’s often illegal to replace original windows with modern double glazing without planning permission, meaning aluminium window frames may not be for you. In this case, secondary glazing could be a good option if you want a better insulated home. Sound like a good fit for you? Learn more by heading to our page: Secondary Glazing Cost and Benefits: How Much Can You Save?.


Different styles of aluminium window

Aluminium windows come in a variety of styles, and you need to choose the one that’s most suited to your home. Whether your windows open outwards or inwards, slide, fold, spin or somersault tells people a lot about your personality. Are you looking for something simple, or do tilt & turn, bi-fold sliders take your fancy?

Casement windows

You can’t beat the casement window on simplicity. The human arm was basically designed for opening one of these. It’s attached to the frame by hinges on one side and it opens outwards, giving you total control over how much rain you’d like to enter your house.

For a luxury twist on a traditional style, think about aluminium flush casement windows. The exterior frame is made from hardy aluminium, but the interior is charming timber. Genius.


Casement windows

Sash windows

Another one for the traditionalists, sash windows are straight out of the Georgian style manual. For many people, even the mere sight of a sash window will transport them into their favourite 18th-century costume drama. An open sash window won’t protrude outside your house, which is great if you want your external walls to stay streamlined.


sash windows

Sliding windows

These are basically sideways sash windows, although they’re even easier to use because you’re not working against the force of gravity. Good for weak arms.


Sliding windows

Fixed panoramic windows

Your house is nothing without its walls, but if you’re living next to stunning scenery then you want as little wall (and as much glass) as possible. The fixed panoramic style gives you floor-to-ceiling windows, increasing your access to the views outside without jeopardising the stability of your roof. The windows run on sliders, but you’re sliding a pretty large piece of glass so it requires a bit of elbow grease.


Fixed window

Tilt & turn windows

These fancy things are as versatile as they sound, tilting or turning at a moment’s notice. If you want your window at a trendy angle then get tilting, while the turn function is helpful if you need to let in a blast of air or make a quick escape. Beware: these windows open inwards, so watch your face.


Tilt and turn window

Bi-fold windows

Now imagine a sliding window that crumples as it opens. By folding compactly to one side, bi-fold windows work great as a divider between your house and garden. If you’re having a summer party, just shove your window to one side and it will be well out of the way.


Aluminium window warranties

When you are shopping around for your new aluminium windows, it’s important to ask each supplier what type of warranty they offer and if it’s included it in the quote.

There are different types of warranty to be aware of and their lengths will vary across supplier, so check with each exactly what you are getting.

Most leading double glazing companies offer the following guarantees:

Whole window guarantee

This is a typical manufacturer’s warranty for the window. The standard length of a guarantee for aluminium windows is anywhere between 10 – 25 years.

Sealed unit guarantee

This guarantee protects the sealed gap in the window and means if you spot certain issues including fog or condensation, the company should repair or replace the panes for you. Warranty lengths vary between companies, from 10 years to a lifetime guarantee.

Some companies also offer other guarantees, it’s worth asking your window supplier whether they provide guarantees for the following:

Discolouration guarantee

Offered against the colour of the frames and sometimes the aluminium itself. Length of terms vary, for example between 10 – 25 years.

Window frame guarantee

Similar to the above guarantee, though this applies more to the aluminium frames themselves. Length varies between 10 – 25 years.


What are the alternatives to aluminium windows?

There are three alternatives to aluminium windows: timber, PVC and huge gaping holes in your walls.

Timber is classy and always looks the part, but it’s usually the most expensive option and it requires a lot of maintenance.

PVC is more practical and doesn’t cost an arm and a leg, but its appearance is rather hard to love.

Aluminium lies somewhere between the two in terms of price, and we believe its value for money is second to none. The frames will give you a whole new perspective on the outside world.


Finding an aluminium window installer

Once you’ve decided if aluminium windows are right for your home, you’ll need to find an installer that suits your needs.

Feel free to check out our guide to the best double glazing companies – or you could go one step further and answer these questions to start collecting free personalised quotes today.


Aluminium windows are almost always more expensive than uPVC windows, because of the cost of the materials and the higher manufacturing costs. However, aluminium can be more cost effective in the long run because they’ll generally last longer than uPVC, and are more durable.

If your aluminium windows are more than 20 years old, you should consider replacing them. After 30 years, it’s definitely time to get new window frames, because aluminium already has one of the lowest insulation ratings for window frame materials.

Aluminium window frames have poor insulation compared to most other materials, which can make their lifetime cost greater because of higher energy bills. They’re also not great for preventing condensation, with moisture and frost more likely to form inside aluminium-frame windows.
Written by:
Charlie has been researching and writing about the home energy market for over five years, and he has been the editor of The Eco Experts since 2021. Charlie's thoughts on solar panels have seen him featured in various publications, including The Times, Ideal Home, and Grand Designs Magazine. Ever since he can remember, Charlie has worried about the planet, and he one day dreams of owning a solar power farm.
Reviewed by:
Tamara Birch, senior writer, The Eco Experts
Tamara has written about environmental topics for more than four years. This includes advising small business owners on cost-effective ways, like solar panels and energy-efficient products to help them become more sustainable. 
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