Alumina by Liniar: a true aluminium door system

Alumina by Liniar offers a unique concept in aluminium doors – bi-folding, residential or French doors – breaking new ground with superb strength, high security, low U-values,
sculptured lines and a ‘warm touch’ exterior.

Designed and developed by the same team of experts as the Liniar window system, the Alumina door range offers superb thermal performance and a host of other features to appeal to the discerning consumer.

Residential Door

Perfect for an entry or access door, with the same style and finish as the rest of the Alumina range. Find out more here.

French Door

Ideal for balconies or rooms where space is restricted as an alternative to a Bi-fold door. Find out more here.

Bi-Fold Door

The jewel in the crown, available from 2 to 7 panes with a height of 2.5m sash size of 1.2m. Find out more here.

Alumina for…


No specialist machinery required – Alumina is made using standard aluminium machinery.
Find out more…


Offer customers an aluminium door with the same woodgrain foiled finish as Liniar windows.
Find out more…


Choose an aluminium door that’s engineered with high thermal efficiency.
Find out more…


Now you can achieve a highly energy efficient building with beautiful expanses of glass.
Find out more…

Alumina completes the fully matching range of thermally efficient fenestration products available from Liniar.

Starting from scratch with a slim, lead-free uPVC window system, the Liniar team has continued to design and develop innovative products. You can now choose a fully matching installation, with the highest quality products including:

Visit to see the full range.


Designed from scratch

The team recognised the need for a pure aluminium doors that fully matched with Liniar uPVC windows – so they designed one!


Superior U-values

With 28mm double glazed and 36mm or 40mm triple glazed units available, Alumina offers ‘true’ U-values as low as 1.3W/m²K, thanks to its innovative thermal lock.


Low thresholds

Liniar’s optional aluminium low threshold is just 23.5mm high at its highest point, requiring no trench excavation to install. Add a low threshold tray to make it Part M compliant.


Foiled ‘warm touch’ exterior

Your Alumina door can be foiled with any woodgrain or coloured finish – for a beautiful colour match.


High security

Alumina ensures the highest security with multiple bi-directional locking points, shootbolts that secure firmly into the track, built-in anti-lift features and anti-bump cylinders.


Attention to detail

With innovative features including folding keys, ergonomic handles, hidden fixings for hinges and discreet magnets, the attention to detail is what makes an Alumina door ‘best in class’.