Uniquely designed

A true aluminium door system, Alumina offers superb strength and high security, with panes spanning up to 1.2m wide and 2.5m high.

At Liniar, we take pride in listening to the needs of our customers. Their feedback made it clear that there’s a need for aluminium doors for larger and more heavy-duty applications, however there was nothing on the market to match a uPVC window system.

This got us thinking – what if there was a way to create a true aluminium door with the same sculptured profile as the Liniar window system?

What if we could make it the most thermally efficient aluminium door out there?

And what if we could foil the exterior, so it matched perfectly with uPVC windows?

We did consider multi-material clad hybrid doors – however our feedback showed there are inherent problems with this type of door. Not only do they require specialist machinery and set-up costs, they can be extremely difficult to fabricate. Furthermore, the warmth of the PVCu is hidden away inside the profile so it’s difficult for consumers to see the benefits of such a system.

A true aluminium door was the answer.

With these objectives in mind, the Liniar design team embarked on a project to create the first thermally efficient aluminium bi-fold to match a PVCu window system, closely followed by the Residential and French doors.

The results are clear – Alumina by Liniar breaks ground with superb strength, high security, low U-values, sculptured lines and a ‘warm touch’ exterior.

And with it, Liniar becomes the first systems company to offer a full suite of fully matching products for any home or building.

Colour Options

Discover the wide range of colours and finishes available with Alumina doors.

Door Styles

Find out more about the styles and configurations available.


Alumina doors are available with many threshold options, for the ultimate in choice


Download a PDF brochure for Alumina today

Liniar was created by bringing together some of the most knowledgeable and forward thinking designers in the window industry – with more than 500 years of experience between them.

With a focus on research, development and design, the Liniar range continues to push the boundaries when it comes to product innovation. Continued investment in infrastructure, technology and a great team of people has brought market-leading success and sustainable growth.

Liniar has built a well-deserved reputation in the window industry as one of the most innovative systems companies around. This culture is embedded throughout our business, a fact of which we’re justifiably proud.



Made in Britain

The Liniar range is designed, manufactured and tested by HL Plastics at its modern extrusion facility in Derbyshire.



Liniar invests in its product range for the benefit of customers, helping them to grow their own businesses in return.


Fully tested

Liniar products are put through exhaustive testing processes to ensure they are robust, durable and built to last.



Every product in the Liniar range is lead-free, energy efficient, recyclable and easy to transport, to protect our environment.


Quality assured

All products have been subject to the strictest quality standards, in a factory backed with ISO 9001 accreditation.



All Liniar products are guaranteed (please see individual product details for specific details of guarantees).