Alitherm 500 flush casement windows

21st Century windows in a seamless flush style

Alitherm 500 flush casement windows provide all the style of classic windows, with all the advantages of latest-generation aluminium.

Part of our range of premium and luxurious PVCu flush casement windows, Alitherm  500 are seamless, elegant and picture-perfect.  The ideal window to replicate traditional windows and just as effective in a modern home or new extension.

  • Premium, quality aluminium windows
  • Internally beaded for improved security.
  • Excellent thermal performance
  • Traditional or contemporary window handles

Design and Performance

Elegant looks with superb design

Great design with unique looks promises to add real style in your home with excellent energy efficiency and weather protection.

Alitherm 500 flush casement windows come with the latest in profile insulation, combined with our high performance glass for optimum interior comfort and saving you money on your energy bills.

Alitherm 500 flush casement windows in a cream colour and cottage style

Alitherm 500 flush casement windows for traditional homes or new extensions

Available as fixed, side hung or top hung outward opening casements, Alitherm 500 flush casement windows provide all manner of solutions. Perfect for replacing your dated windows or adding the 21st-Century aluminium windows technology in your new extension.

The design of this window collection recreates the look of flush timber windows with a flat appearance lining through with the frame.  Uninterrupted lines also provide equal glass and sightline proportions for a neater, better look. Alitherm windows also give you the latest in security and performance thanks to advanced insulation, engineering and product quality.

Made to Measure

Bespoke crafted aluminium windows

Alitherm 500 flush casement windows come made-to-order to your precise designs, sizes and specifications.

Alitherm 500 flush casement windows in modern grey colour to a kitchen

Choose your frame style then select your colour.  Contemporary black or grey, classic white or anything in between. We also provide a different colour inside and out and the latest ultra-modern textured powder-coated finishes.

The classic or modern adaptability of these advanced aluminium windows also extends to the hardware. Modern striking window handles in many colours or the traditional styles including monkey-tail, peg stays in pewter and other heritage colours.

Specifications

High performance aluminium windows

Innovative thermal technology, quality glass and extensive weather protection protect and help insulate your home

These high specification windows deliver the best in thermal efficiency, performance, security and low maintenance. As standard comes a ‘B’ Window Energy Rating,  a U-value of up to 1.4 W/m²K, or upgraded to ‘A+’ with higher performance glass. There’s also compliance to British Kitemarks and PAS 24 security credentials.

For your new extension, Alitherm 500 flush casement windows meet the requirements of Document L of the Building Regulations too.  Windows come with high security multi-point locking systems, secure locking handles and internal glazing beads, preventing removal of the glass from the outside. A full range of profile styles creates standard bay or bow windows as well as special shapes.

Premium quality materials at affordable prices

The leading aluminium system in the UK

The ideal replacement for your old wood windows or a contemporary look with flexible designs and enormous colour choices.

steel-replacement windows

ELEGANT, BESPOKE ALITHERM 500 FLUSH CASEMENT WINDOWS

Alitherm 500 flush casement windows come from one of the UK’s best brands and let you choose the look.

Traditional windows come with authentic design features.  Monkey Tail or Bulb End espagnolette handles accessorised with peg stays in black or pewter colours or stainless steel.

You can also choose art-deco styles in antique brass, satin nickel or stainless steel. With opening window sizes up to 700mm wide and 1400mm high, enjoy slim frames, more glass and enhanced light into your home. Bay or bow windows, five different window cill options, corner posts and a choice of astragal bars complete the collection.

Case Studies

What our customers say:

excellent dealings from start to finish, knowledgeable sales team and superb fitters
Roy H.
Roy H.
08:22 02 Aug 21
From the first phone call, a visit to the showroom, through to the site survey and installation, the Aspire team have been unfailingly both very professional, problem solving and friendly. They delivered a great product and service, at a good price, on time, with flexibility, diligence and a smile, and that in our experience is almost unheard of these days.We will definitely turn to Aspire again when we next need windows etc, and can't recommend them enough.
Chris Y.
Chris Y.
09:06 13 Jul 21
Brilliant Service from start to finish. From the time we got in touch for initial quotation for our bi-folds doors until delivery of the products and installation this company was a pleasure to work with and highly recommend this company. The entire team we dealt with including James, Danny and his installation team, Peter, Frankie have been very friendly, courteous and professional. Always punctual and did their best to meet all our requirements. Excellent workmanship and quality products. Good competitive prices too. Very pleased with everything and Thanks very much Aspire Bifolds for a job well done.
Buddhika B.
Buddhika B.
10:05 18 May 21
Super impressed with the level of service and how quickly they got the job done. Really happy with our new bifolds fitted just in time for spring!Would definitely recommend
Greg P.
Greg P.
09:50 05 May 21
Aspire did the most beautiful job in our house. The installed our windows a few months ago, and I couldn't be happier.They were always happy to answer to our question.They came at 8 o'clock and installed the windows very swiftly with a very clean and tidy result. They decorated afterwards around the windows and you couldn't tell those weren't the original windows as the result was so good.We have a toddler in of the rooms they were installing the windows and they accommodated their work around his naps which was brilliant.If you are looking for anything window or door related look no further, I will definitely recommend and if needed use them again.
GEMMA M.
GEMMA M.
10:20 28 Apr 21
Aspire supplied the most beautiful 7m sliding doors for my extension. The doors are great quality and all the fitting and snagging very professionally handled. Would not hesitate to use this company. Thank you.
Jo J.
Jo J.
15:33 16 Mar 21
I would recommend Aspire Bifolds. We love our bifolds and the service we received was great.
Karen A.
Karen A.
07:40 16 Mar 21
The team were so brilliant, helpful and lovely to deal with to supply and fit of our new steel look heritage doors. We are delighted with them and heartily recommend using Aspire! A great experience all round.
Andy P.
Andy P.
11:15 05 Feb 21
Best Bifold supplier in Surrey
Martin J.
Martin J.
19:06 06 Jan 21
Great Service from Aspire, with comprehensive knowledge on bifold systems and went with the ORIGIN product. Hassle free communication throughout contract and install just before Christ.as 2020.
Simon C.
Simon C.
16:01 04 Jan 21
We were recomended to Aspire by our carpenter who was building a garden room for us, and we were not dissapointed.From the initial meeting to the completion of the work the company , and especially John Small, and the lads that came to install the doors on one of the wettest days of the year, have been excellent.The Bifolds are amazing. They look so good, and when they open and close they sound solid and beautifully made.Superb job. Thank you.
Simon B.
Simon B.
08:12 25 Nov 20
I don't usually write reviews but Aspire have been an absolute pleasure to deal with from start to finish. After replacing my neighbours sliding doors they came highly recommended. The lady on the phone was extremely helpful and understood my requirements, and my quotation was turned around quickly. I had some technical questions regarding the threshold; and unlike other companies I dealt with, I was not treated as a nuisance and Ji (I hope I spelt this correctly!) talked me through everything. The surveyor arrived within a day of me signing and despite the current situation with many delays, they still installed within the quoted lead time!The Schuco bifolds we now have look amazing and we are so thrilled we went with Aspire Bifolds!Thanks alot Ji and Team.Cliff
Cliff Bentley T.
Cliff Bentley T.
14:33 04 Nov 20
From the very beginning of discussing what products I’d like, through to survey and fitting, Aspire have been fabulous. Very happy with both the products themselves and the service throughout, would thoroughly recommend!
Thank you so much!
Cat P.
Cat P.
10:56 23 Sep 20
Aspire were great to work with and we are delighted with the finished product. We got bifolds, skylight, large side windows and french doors all for a highly competitive price. We had some unavoidable delays due to the pandemic but we were always kept in the loop with what was going on with our order. we are extremely pleased with the quality and value we got through working with them.
Frankie H.
Frankie H.
12:32 11 Sep 20
Very professional. Do a great job.
Rupert P.
Rupert P.
08:23 11 Sep 20
I would absolutely recommend Aspire Bifolds. They provided a great product at a reasonable price. Installation team was friendly and professional. They installed in less than a day.We also encountered a small issue with the measurement of the doors, but the leadership at Aspire was quick to cover additional costs incurred to rectify the issue. We really appreciated their professionalism on this matter.
Tim S.
Tim S.
06:54 10 Sep 20
Huge thank you to Aspire Bifolds for our external steel look doors, we’re so happy with them and the guys were quick, responsive and all around brilliant. Would really recommend Aspire Bifolds.
Libby R.
Libby R.
07:42 06 Sep 20
Very efficient and helpful service 2 years on from original door fitting.Thanks so much Aspire!
Kim L.
Kim L.
11:00 27 Jul 20
Aspire bifolds removed some old wooden sliding doors and replaced them with some lovely French doors. They did a fantastic job- they spent time with me to ensure I had made the right choice of door, it took no time to fit them and the fitter was friendly, polite, clean and courteous. Quote was competitive and I couldn’t recommend them enough!
Natasha H.
Natasha H.
19:59 23 Jul 20
We went with Aspire after getting a few quotes, they weren't the cheapest but were still competitive. We chose them on the basis of their reviews and I am really glad we did! The service has been excellent throughout, our doors were installed far quicker than we were expecting, the fitter's attention to detail is great, and the quality of the doors is fantastic.After installation we did have a few problems with finding marks on the glass, which is provided by another firm, and had a few panes replaced. John, the director, ended up coming round himself and offered to replace the final pane. I know that many firms would just have ignored our calls once we had paid everything, so to have this level of service was fantastic. This proved our decision to go with a slightly more expensive firm in Aspire was the right move!
Scott S
Scott S
12:10 16 Jul 20
After a lot of research I came across Aspire Bifolds, went to the showroom and they have a very good selection of doors to choose from.From start to finish it's been a pleasure to deal with everyone connected to Aspire Bifolds and their aftercare service is first class.Top quality product, installation and all round experience from this company. Would have no hesitation in using them again.
Paresh M.
Paresh M.
12:32 14 Apr 20
Professional first class service from start to finish. Highly recommend on service and price
Catherine Kenton M.
Catherine Kenton M.
18:59 08 Apr 20
We recently used Aspire for purchase and installation of smart system heritage doors for our extension. We are thrilled with the finished product. John and the team are brilliant, every person I spoke to was helpful and friendly. Email response was really fast. The whole process from start to finish was seamless and stress free.The installers were efficient and tidy, they left the place cleaner than when they arrived. Following installation we noticed a scratch on one of the panes, we thought it could be buffed out, but the whole pane was replaced without issue within a week.It is rare to find a company with such great customer service and work ethic these days. I would certainly be happy recommending Aspire to anyone.
Rebecca D.
Rebecca D.
11:39 27 Feb 20
I visited Aspire Bifolds to discuss some technical details of the installation requirement for sliding doors. Both of the staff I dealt with were friendly and helpful and in particular Ji was able to answer all of my questions and demonstrate some of the details on the door installation in the showroom. Overall a very helpful visit.
GeoffandLesley H.
GeoffandLesley H.
23:47 22 Feb 20