UPVC Bi-Folding Doors

Imagine being able to open up an entire wall of your room, creating space and letting fresh air and natural daylight flood into your home.

Whether you have a bedroom with Juliette balcony, a dining kitchen, a conservatory or an orangery, bi-folding doors can provide a stunning alternative to patio or French doors. Liniar’s bi-folding doors were the first fully bespoke PVCu bi-folds to be designed, engineered and made in the UK – and we believe they are still the best.

Available in a wide choice of opening configurations and colours, your Liniar bi-fold has ultra-slim sightlines, providing your room with a clean, modern appearance Safety features include the innovative low threshold option for family friendly and wheelchair use, meeting Part M building regulations.

What’s more, the Liniar bi-fold offers high energy efficiency, combined with the best security features on the market – bringing you a modern space-saving solution for your home that will definitely give it the ‘wow’ factor. 

Helps to keep the heat in

One of the most effective ways you can save energy within your home is through installing energy efficient windows, doors and roofs.
Liniar frames outperform most of the other leading brands in the UK when it comes to thermal efficiency – mainly due to our innovative PVCu multi-chambered profile design.
The thermal efficiency of a door is measured in U-values, which demonstrate how effective the door is at preventing the transfer of heat into and out of a building.
The lower the U-value, the higher the doors’ effectiveness at keeping the heat inside your home when it’s cold outside.

The Liniar bi-fold door can achieve a U-value of1. 0 W/m2K, meaning you’ll be able to enjoy awarmer and quieter home as well as lower bills.

Furthermore, Liniar’s patented bubble gasket isco-extruded as part of the manufacturing process – meaning seals aren’t fitted separately and therefore unlikely to leak.A continuous seal all the way around the frame eliminates draughts and provides resistance to water.

Safe and secure

The shootbolt locking mechanism in each Liniar bi-folding door ensures the door is bolted firmly into the stainless steel track, maximising your security

Built in anti-lift features, anti-bump cylinders and optional anti-snap cylinders combine to bring you peace of mind.

Liniar’s bi-folding door range is also available with ModLok™, a new concept in locking technology.

ModLok™ is a highly innovative combined reinforcing and locking mechanism, bringing additional strength and rigidity to the doors and enabling you to have even wider configurations of bi-folding doors. ModLok™ also offers enhanced security features including 3 opposing hooks and 2 shootbolts built in to every master door, plus 2 anti-lift shootbolts on every slave door.

The Liniar ModLok™ bi-fold offers all the structural benefits of an aluminium door set combined with the thermal benefits of PVCu. For more information please visit www.liniar.co.uk/modlok.

Fully Accredited

Secured by Design

Liniar Secured by Design products are designed with exceptional security features and confirmed as meeting the requirements of the Association of Chief Police Officers.

BS EN ISO 9001:2008

Liniar’s factory has BS EN ISO 9001:2008 accreditation for quality management systems - proving its strong customer focus and continuous improvement cycle.


An independent testing house conforming to British standards and accredited by UKAS and the BFRC. Liniar’s ModLok™ bi-fold door was first to pass its Folding/Sliding Door Scheme.

PAS 24:2012

The British Standard for enhanced security performance, PAS 24 testing also includes testing for air and water tightness and wind loading to BS 6375.