Aluminium Window Sizes

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Nick Dardalis

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Many home extensions and renovations are designed to be contemporary in their appearance and boast large windows and doors.  This is reinforced by the various home renovation programmes where the finished project will often demonstrate large sliding doors and more recently large opening and fixed light windows.

many modern apartments and houses now call for bigger opening windows.
Many modern apartments and houses now call for bigger opening windows as shown here with a SAPA Dualframe Window

If you are considering large windows there is a choice of aluminium window systems to choose from.  With many of the leading systems companies having a range of casement windows to suit both traditional and modern homes, extensions or other projects these may require large pieces of glass fitted to bigger windows than normal  With some window systems, already large opening windows can be made even larger as some systems offer a  “heavy-duty” sash or vent section (the part of the window that opens) to enable big square top hung casement windows or side hung windows to be manufactured.

So if you are looking at big glazed screens with large opening windows what are the typical sizes available to you?

What are the minimum and maximum aluminium window sizes?

In this article we will use the standard casement window offerings from some of the leading aluminium systems companies such as SAPA Building Systems, AluK Systems, Smart Systems, Schuco Aluminium Systems and the new Origin Aluminium Window.  There are of course many other window systems available, but these are the most widely used products in residential properties in the UK today.  Some of these systems are available with either a commercial or residential suite but for the purposes of this article we are looking at typical residential systems.

If you are looking to construct a bespoke screen or are looking at ways of having the largest possible opening windows, then the following chart will be useful.

SystemTop Hung WindowSide Hung WindowHeavy Duty Top Hung WindowHeavy Duty Side Hung Window
SAPA Crown Casement Window1200×1336736×1336n/an/a
SAPA Dualframe Casement Window1200×1200700×13001600×1500838×1829
Schuco ASS 70 Casement Window1400×1200700×14001800×1800700×1600
Origin Casement Window1500×15001000×1800n/an/a
AluK 58BW Window1500×1500700×1500subject to hardwaresubject to hardware
Smarts Alitherm 600 Window1400×15001000×1400n/an/a
Seniors SPW 600e1500×1500900×1500n/an/a
Metal Technology2000×20001000×1800subject to hardwaresubject to hardware

*All sizes given are opening light sizes and not overall window sizes.

*Information given is a guide only with approximate sizes based upon specific hardware.  Advice should be sought with your supplier as to the feasibility of large opening windows within your own project.

5 Things to consider if you are thinking about large windows

  1. The larger the window, the heavier it will be.  Most systems companies whilst offering minimum and maximum window sizes have conditions based upon the overall “sash weight”.  It is very important to remember that friction hinges or friction stays are what hold the opening vent to the outer frame and it is these hinges that take up all the weight, stresses and downforce when the window is fully open.
  2. The choice of glass will also affect the overall weight of the window.
  3. The larger the window the larger the projection outwards.  This is particularly the case on top hung opening windows that have the handles at the bottom and project outwards.  Some of these aluminium systems can create very large windows indeed and you will need to consider how far out a large window will actually open.  In many cases such large windows are fitted with restrictors to prevent them fully opening outwards with a release function on the windows to enable to open out further.
  4. Many fixed windows are possible at overall areas of approximately 5 square metres but this is dependant upon the individual window design and maximum sizes of glass possible.
  5. There are many aluminium systems available and some systems companies can even create bespoke windows therefore always seek professional advice as to what windows will best suit your own wishes or contact us and we can give you further information.

What is better for large windows? Aluminium or PVCu?

the new origin aluminium window is a bespoke window manufactured to the same exacting standards as their successful bifolding doors.
Particularly above bifolding doors there is a need for large aluminium windows as shown here by the Origin Window.

It is already well known that aluminium has inherent strength which is why it is the preferred choice for windows in modern construction projects.  Aluminium has been used commercially for many years already as commercial buildings will typically have larger windows and glazed screens than most houses.

Aluminium windows are typically two and a half times stronger than PVCu.  What this means for the customer is that whilst aluminium windows have much slimmer sight lines than any timber or PVCu window they can actually support substantially larger panes of glass and glass areas even with their much narrower frames.

Therefore using aluminium for your windows not only gives you slimmer stronger windows but larger windows with more glass to look through and arguably more attractive windows with less visible bulk.

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16:42 30 Oct 23
Nick responded incredibly quickly to my enquiry (on a Saturday too!), and was able to offer invaluable advice on both aluminum systems and manufacturer / suppliers. Thanks Nick!
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16:18 09 Oct 23
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19:55 13 Sep 23
Extremely helpful with pointing us in the right direction to find the products we required and suggesting firms that could reliably fit them.Nick was quick to reply and very detailed in his advice.Highly recommend reaching out to them.
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07:03 11 Sep 23
Update - A second email to nick for help on bifolds resulted in a detailed informative reply even on a Sunday ! This guy is so knowledgable and helpful .I approached Nick for an independent view on sliding doors v bifold and the different brand options . His reply was extremely detailed and prompt and allowed me to navigate this often confusing world in a much more informed way . Thanks so much Nick
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12:45 05 Sep 23
This is a must site for anyone looking for advice. Great service and very quick answers to questions. Nick has been of great help quiding us through the maze of aluminium products. Thank you
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20:24 26 Jul 23
I contacted Nick @ ATS for guidance on what aluminium sliding door systems would be suitable for an opening in an extension that is going to be both wide and tall. He came back really quickly with very detailed and incredibly helpful advice. He is clearly extremely knowledgeable about the systems on the market and their respective features and capabilities. If you’re feeling a bit lost by the overwhelming range of choices out there, I’d definitely recommend contacting him.
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10:06 04 May 23
Nick is very helpful indeed. Extremely knowledgeable on bifolds which was in relation to my query. Great website as well, some very useful articles. Particularly appreciated the article that lists all the major bifold options in order of their sightlines! Thank you!
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After a lot of research to find doors that would meet our unusual size requirements and feeling increasingly uncertain about the best way to spend our small budget, I stumbled on the ATS website, and I'm so glad I did! I contacted ATS to request advice and Nick promptly replied with a wealth of information, providing us with options and relevant contact details. I only wish I'd found them sooner!
Carol NortonCarol Norton
10:01 17 Mar 23
I've been so confused about how to achieve the look I'm after, and going round in circles with various window/door companies, trying to get away from the huge chunks of plastic currently around my windows. I didn't expect an email to a company found through a Google search to really help - but I was desperate, so I tried. I'm SO glad I did. Finally I have clear explanations from ATS of where I've been going wrong, exactly what I'm looking for, and a list of local companies that might be able to provide it! The response has excelled my expectations and I feel as if I'm finally inching closer to a home with which I'll be happy and comfortable: thank you.
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It is rare that I write reviews, however after my very positive communication with Nick - enquiring about suitable slim sash aluminium windows for my project, I felt that a review was definitely warranted. I can reinforce the many positive reviews posted so far, Nick was very quick to respond, providing comprehensive detail, with excellent independent advice.In summary, great service, thank you Nick.
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13:04 09 Mar 23
Nick from Aluminium Trade Supply was incredibly helpful informative and pleasant to deal with. He responded quickly to emails and was very knowledgeable. Highly recommend being in touch with Nick if you are considering new aluminium windows or doors.
Lee JonesLee Jones
20:21 22 Feb 23
I dropped Nick at Aluminium Trade Supply an email re high security slim sightline bi-folds and their alternatives and he responded that quickly (and so comprehensively) that I felt bad I’d not paid him for his time!Nick Sir your product knowledge is outstanding and you are providing a level of service that goes wayyyy above and beyond expectations. I’ll definitely make sure I mention Aluminium Trade Supply to anyone I encounter looking for a fenestration solution 🙏🏼
15:13 13 Feb 23
We are looking to replace some old UPVC patios doors with aluminium ones. The ATS website is a great source of advice in an area where clear information is sorely lacking. Having used the website, I then followed this up with a number of specific questions relating to our search, and Nick came back very quickly with clear, detailed and very useful advice.I have been very impressed with both the website and with Nick's advice. My only regret is that I didn't come across ATS before replacing various windows in 2021 - I'm sure it would have saved me a lot of grief and money! Thanks again Nick.
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11:21 08 Jan 23
Nick was super fast to respond and provided some great recommendations. I would recommend this website to anyone looking to find bifold or sliding aluminium doors.
Stephen HoustonStephen Houston
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Looking for aluminium crittall style internal door and external patio French doors. Noted good reviews and thought would ask for advice. Comprehensive reply with excellent independent advice and lists of fitters who could provide products and installation. Great service.
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08:25 21 Dec 22
Nick from Aluminium Trade Supply has been extremely helpful with navigating the jungle that is aluminium glazing for our upcoming extension project. His advice was prompt, detailed and always impartial. Very grateful for your input, thanks Nick!
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Brilliant website and an excellent service. Nick provided not only detailed advice and supplier contacts, but highlighted the considerations of various products so I could make an informed choice. Our Sunvista minimal sliders were fitted this week and I couldn't be happier, stunning. Thanks once again for your advice and recommendations, invaluable!
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