Decalu Aluminium by Deceuninck

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Nick Dardalis

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Deceuninck already enjoys an excellent reputation in the UK and Europe with its range of PVCu windows and doors. New to the UK is the Decalu Aluminium range based on the already successful European systems. This article gives an overview of what you can expect with Decalu Aluminium by Deceuninck.

Information about Decalu Aluminium by Deceuninck

decalu aluminium windows
Decalu Aluminium Windows
modern aluminium windows

Decalu is widely used in Europe and now available in the UK, it's a very well-designed system with lots of installer-friendly features and overall attractive for residential property. Still a little hard to find nationwide.

Editor's Rating:


  • Attractive European styling
  • Very good U-Values
  • Good range of matching doors
  • Very well engineered


  • Not yet widely available
  • Too heavily marketed at the installer
  • Hard to spot the homeowner benefits

Deceuninck is a long-established company with operations in Europe, North America and elsewhere. Better known for PVCu products in the UK, the Decalu aluminium system has been in Europe since 2017. Multiple production sites, extensive warehousing and distribution centres place the company very well to serve both existing and emerging markets.

With Decalu aluminium, the company introduced the system, meeting the current demand for aluminium products. In fact, aluminium sits very well alongside the entire product range. In researching the system we found a lot of window companies all over Europe promoting Decalu and marketing the system very favourably.

There is also what we see as changing trends in windows and doors generally. Our view is that windows will move towards even more insulation and performance. Other than going to higher-performance glass or triple glazing, one way of achieving this is through hybrid windows. These embrace a combination of materials with aluminium.

In the Decalu aluminium system, Deceuninck doesn’t use the conventional thermal break of other systems. The company uses its expertise behind its excellent PVCu product with a visible European slant on the aluminium products. They’re quite different in design too. And we think they will certainly appeal in the UK market too.

Moving to aluminium in the UK is also a logical step. A healthy market, an established system and the backing of the systems company. And with plastics being an integral part of the company, why not integrate these into aluminium profiles providing better U-Values too.

deceuninck decalu aluminium windows

Deceuninck Aluminium Windows Collection.

For the window manufacturer, Decalu comes with several features designed to simplify fabrication and stockholding. Press releases state that dual colour and marine-grade powder coating is to be standard. Very cleverly, Deceuninck has also designed a system that long-standing PVCu fabricators can easily integrate with familiar manufacturing techniques they already use in producing PVCu. An example of this is retaining the PVC-U Eurogroove using the same gearing and hardware.

The obvious benefit is less factory disruption and a more seamless transition for those looking to start making the system. Of course, they’ll also be dealing with a systems company they’re already familiar with.

Other features of the Decalu System.

Deceuninck also says that the system will come with features as standard, offering a little more than you get with the current crop of systems like Aluk, Smarts, Origin, Schuco, Reynaers and others. Here are just some of them.

  • Casement windows, residential doors, sliding doors and bifolding doors within one system.
  • Colour matching to the current Deceuninck Colorways
  • The ability to sell both PVCu and aluminium products from one system – ideal where bifolds and sliders remain more popular in aluminium.
  • Pre-inserted gaskets without the shrinkage associated with conventional manual methods of insertion.
  • Enhancements designed to offer fabricators savings on production costs and improved margins.

Our issue with the marketing of Decalu is that it’s too installer focused. Fast to glaze, easy to specify, and a very fitter and trade-friendly system. Decalu’s trade benefits are genuine and beneficial. However, there is little in their marketing targeting the end user and providing compelling marketing for the end user, so they ask for these windows by name and ask for them. This website receives enquiries for most aluminium brands, Decalu less so. And where we have, the question is around struggling to find much information about the brand and products generally.

Types of Decalu Aluminium Windows

The aluminium windows series comprises Decalu 88, Decalu 94, Decalu 110. In this range, you’ll find several window options meeting most homeowner or trade requirements for aluminium windows.

The Decalu 88 series provides flush casement top hung or side hung windows. These also provide desirable sightlines that will appeal to both traditional and modern houses, thanks to their even looks and seamless lines. They come with a familiar open out casement with a square bead, groove on the inside and overlapping casement on the outside.

Also available is the hidden sash design that’s hidden entirely behind the frame. This excellent feature creates ultra-modern-looking windows with added architectural appeal and a sleeker overall appearance.

Those looking for steel-look windows have the option of two options in the Decalu 110 and Steel look 88. The frame depth match in millimetres the system name. One offers a similar look to the W20 series with a picture frame detail. The other has a more profiled, industrial look. Ideal for modern extensions, old building renovations and other applications without losing the architectural appeal of the building. choosing the Decalu88 slimline version promises a window with reduced sightlines.

There is also a hidden sash design. Choosing the hidden sash model benefits from one sightline throughout, irrespective of whether the window has fixed or opening elements. Few aluminium systems in the UK have this option. Furthermore, we think will appeal to many for its flush look without the obvious sightline where the window opens.

The Decalu 88 hidden sash looks neat, seamless and flush viewed from the outside with the opening light sitting behind an additional profile. The hidden sash window is slightly deeper at 94mm, whereas most other windows come at 83mm. That said, you get very good thermal insulation and acoustics in double or triple glazing. The water resistance of the window is also excellent at 2250Pa.

Hidden hinges and invisible gasket lines are also nice features of this window.

Finally, the Decalu 94 retro has a similar external appearance to wood windows. Here you get a sculptured look around the window perimeter and a neat groove separating the frame and the sash.

The Deceuninck collection of residential doors.

Also in the Decalu 88 range are residential single and double doors. These provide a flush-mounted design, low threshold options and are suitable for both modern projects or traditional houses. The doors come as fully glazed or combined with plain or decorative aluminium panels.

For bifolding doors, Decalu88 bifolds come in multiple configurations. Choose opening in or out, with standard or low thresholds and the option of triple glazing. The sightlines are square, appealing to the wider market.

Sliding doors in the Deceuninck Decalu163 suite provide lift and slide patio doors with strength and reliability. Decalu163 also comes at reduced sizes creating horizontal sliding windows.

where to buy Deceuninck Decalu Aluminium

Deceuninck is still growing its fabricator base for Decalu aluminium, and the product is steadily growing its visibility in retail showrooms. It is a little challenging to find the brand nationwide. The trade can get in touch for more information about the products, whether a fabricator, installer or trade counter. Homeowners can also get in touch for information on where to view the products and a quotation.

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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!
chris steerchris steer
16:18 09 Oct 23
Had a meeting with Nick during the grand designs show. Was extremely helpful and professional would highly recommend
Chris WesthorpChris Westhorp
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.
Cathy GreenwoodCathy Greenwood
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
Anthony CraigAnthony Craig
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
Philip DuffieldPhilip Duffield
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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17:25 19 Jul 23
Nick's advice is great. He is always quick to respond and spends time on responses, which really help to make an informed decision.
Alan FosterAlan Foster
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Absolutely fantastic. Asked for advice about replacing Crittall (?) windows late last night and early this morning received 3 great suggestions and contact information for suppliers
Rachel LauRachel Lau
09:24 16 Jun 23
Fantastic website full of valuable and pragmatic advice about product selection and comparison: no other website gives information like this. Truly written for public interest. Don't hesistate to reach out to Nick via the mailing system. He responds very quickly, is friendly, and has very sound and high knowledgable advice. I have already shared this with my friend planning her own grand design.
guard Charlieguard Charlie
12:28 14 May 23
I emailed this company just on the off chance they could help me with new magnetic sliders for my patio door. They were not able to supply those but were so very helpful providing me with the name of a company who could. I am so very grateful at the great service. Dare say customers must be very happy. thank you so much.
Benjamin LewisBenjamin Lewis
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!
P JonesP Jones
08:07 15 Apr 23
I asked Nick some questions about an installation we were considering and he replied within hours with some very useful suggestions that will probably lead us to using a different make and supplier. Thanks, Nick. Great work.
Nicholas WallNicholas Wall
13:18 02 Apr 23
Looking for fair and honest expert advice on all aspect of aluminium windows and doors? These guys will arm you with all the information you need to make the RIGHT choice in a highly complex, crowded marketplace. post a question and you will get a very quick professional answer you can rely on being based on fact. Thanks guys!
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16:25 21 Mar 23
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.
David NunnDavid Nunn
20:54 14 Mar 23
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.
Chantal AuerbachChantal Auerbach
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.
Azza McCabeAzza McCabe
17:47 01 Feb 23
So impressed with this company.Responded to my query quickly andgave valuable advice. Nick was extremely helpful and we were able to move forward with our project.
Adri LoloçiAdri Loloçi
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
16:16 03 Jan 23
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.
Inga GeachInga Geach
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!
Amanda BurtonAmanda Burton
10:54 16 Dec 22
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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17:18 10 Dec 22
Very helpful advice given to my question, including the name of 3 different companies that i could try for the product being enquired about. Many thanks
Munim ChowdhuryMunim Chowdhury
11:45 13 Sep 22
Nick has been very helpful on signposting me to a number of partner organisations for steel/aluminium doors.
SUSAN wallaceSUSAN wallace
17:26 31 Aug 22
My experience with this firm was exceptionally good and this is notalways the case as a female, dipping a toe into technical waters.I was spoken too with courtesy and at a level that helped me consolidate what was needed .On top of that I was given a list of companies and places where I could obtain the type of product I needed.I could not thank them enough and would certainly go there again and reccommend others do too.
Paul SalterPaul Salter
22:39 22 Aug 22
Contacting Aluminium Trade Supply is like contacting the Oracle direct. Advice is always comprehensive and balanced. On multiple occasions they have provided me with options that fully meet our objectives. Many thanks.
Nick McCormackNick McCormack
20:25 14 Aug 22
Really helpful and useful came back to me on a Sunday with some invaluable information. Highly recommended.
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13:14 14 Aug 22
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