The trusted aluminium and PVCu supply for trade and commercial projects

Traditional look, modern performance

The Alitherm heritage door and window range features the slim profiles and sight lines that are associated with traditional steel doors and windows while using innovative polyamide thermal break technology to provide the outstanding thermal performance of a modern aluminium system.

The right fit

Choose from fixed windows, tilt and turn, side hung or top hung open out casements, and single and double doors which are available in a wide range of sizes for your project.

Enhanced thermal performance

The Alitherm heritage door and window range achieves a window energy rating of ‘B’ and a U-value of 1.5W/m²K (using the correct glass unit).

Document L Compliant

Alitherm heritage windows and doors are designed to comply with the revisions to the Building Regulations and is Document L compliant for the highest standard.

The perfect finish

Alitherm Heritage products are available in a choice of standard or non-standard colours, including dual colour, and with heritage and Art Deco hardware options.


A stunning range of slimline aluminium doors and windows

The Smarts Alitherm heritage door and window range is perfect for UK installers where planning or design constraints must be considered. As a contemporary and authentic alternative to traditional steel materials, Alitherm Heritage has been designed to meet strict conservation standards thanks to its meticulous attention to detail and modern construction and it is an ideal choice for restoring Victorian and art deco properties.

Featuring unique slim sightlines, the system can be tape or gasket glazed and the doors and windows feature multi point locking and face mounted shoot bolts and security tested to PAS24:2016. Weather tested to BS6375 Part 1 and achieving a window energy rating of ‘B’ and a U-value of 1.5W/m²K, the durable system is perfect for any product portfolio.

Get in touch

We have been using TWR since we started our company in 2014. They have always given a friendly and efficient service so I would have no hesitation in recommending them to other installers.

Cumbria Windoworks

Having worked with TWR for over eight years and purchasing all our commercial and aluminium products from them I can’t recommend them highly enough. They provide us with high-quality windows and doors efficiently and at a very competitive price

Everglade, Manchester

We have worked with TWR for 10 years, the product supplied is nothing short of excellent, and the enquiry stage is smooth all the way through to the aftercare. Commercial or domestic TWR will advise on and support you through ordering!

TWG, Lincoln

Dealt with Terry and Dawn, simple and to the point ordering of windows and aluminium Bifolds. Very helpful and honest.

Can recommend to anyone!

Dan C