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 promise to add real style in your home with excellent energy efficiency and weather protection

Perfect for traditional homes or modern 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.

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 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:

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
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.
16:28 23 Jun 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
Fantastic Job done on fitting a 5 door Bi-Fold run. Great, clean and considerate fitters. 100% recommend. Removed and replaced (with new) a poorly fitted (by different Company) previous set of doors that now look great. Thanks Guys! 👏🏻👏🏻. Neil
Neil H.
Neil H.
11:33 30 Jan 20
Helpfull, but pricey good quality
Mikey B
Mikey B
17:24 07 Jan 20
The doors and blinds look brilliant. Dealing with Aspire was very efficient from browsing and ordering to fitting, absolutely great from start to finish. Very professional and exact with advice and information. We opted for the solar integrated blinds and love them. When it’s dark and the blinds are closed we still get to enjoy the expanse and look of the doors. Definitely recommend Aspire.
Sheila H.
Sheila H.
21:00 15 Dec 19
From the start to the finish, it has been straightforward dealing with Aspire Bifolds. We are very much appreciative that they were able to accommodate us ahead of the original booking time to fit in with our scaffolders. Thank you very much guys, we will be recommending you to others.
Y H
Y H
14:22 02 Dec 19
A first class service from everyone John, Peter, Danny and Luke - amazing friendly team of professionals from start to finish. If your looking for expertise with the drive to make it happen seamlessly then i would highly recommend visiting Aspire Bifold. I love the new bifolds and kitchen window! Many thanks to you all and thank you for turning my job around so quickly.
R A.
R A.
22:33 29 Nov 19
I have been running a construction firm for over 35 years, this has been one of a nicest and most professional company's I have dealt with, fantastic from our first enquiry to finish job. Highly recommended.
zareh J.
zareh J.
13:50 24 Nov 19
From our first interaction with Aspire and James in particular, the customer service and quality of work has been unbeatable. We are 100% happy with the finished doors and wouldn’t hesitate to recommend them.
Lisa M.
Lisa M.
19:19 29 Oct 19
Cannot speak highly enough of this company. I love my door and heritage patio doors. Delighted with them and their customer after sales are the best! Thank you all so much I am a very happy customer
Lisa W.
Lisa W.
11:07 25 Oct 19
Outstanding service from John and his team. Having had a bad experience in the past with a window installation company, I cannot praise Aspire enough for their professionalism as well as their competitiveness.
Alexandra B.
Alexandra B.
07:19 22 Oct 19
Amazing to deal with from start to finish. The sales people know what they are talking about and the guy who installed our glass screen panel was so diligent, careful and truly professional! I will recommend and use again for sure.
Roberto N.
Roberto N.
13:10 08 Oct 19
We were looking for specific style of windows and found that Aspire met those expectations. Our initial meeting with John was crucial to us as we needed him to understand the period that we were looking at. Their team are dedicated to ensuing quality. The fitters they have also share the same ethos of ensuring quality. We highly recommend Aspire as a preferred window company. We will be coming back to them to replace our other windows in due course.
Sandra F
Sandra F
07:31 15 Aug 19