Lons Aluminium Products

See our range of

Bi-Fold Doors

Every Element Right

Our bi-fold doors come rigorously tested to keep your home fully protected. Certified to the advanced PAS24:2016 standard, their strong, durable aluminium frames come with enhanced security that includes a 3 Star Yale locking barrel, high strength shoot-bolts and multi-point FUHR locking systems.

The shootbolt handle has an innovative and unique antibackdrive feature engineered into it. This means that even unlocked, a forced entry attempt can’t rotate the handle to open the door.

The doors are also internally glazed using our unique patented clip glazing bead. This offers the kind of reliable, robust security that you should expect.

With a clean, consistent and slim design, our bi-folding doors superbly reflect the care with which they were made.

The aluminium profiles that make up the Korniche bi-folding door use polyamide thermal breaks to stop thermal bridging. These are fitted after each half of the sections are powder coated, ensuring stark lines and a striking contrast between the two elements.

Bespoke handles come in matching finishes, while the frames themselves can be powder coated in colours as natural or as vivid as your vision requires.

These beautiful finishes are highly durable, with narrow profiles and glazing seals hidden within the frame, meaning more glass to help you enjoy more of the view.


  • Our traffic door and shootbolt handles are available in matching finishes of black, white, grey, polished chrome or brushed stainless steel

  • 100mm, 150mm or 190mm cill options

  • Standard or integrated cill thresholds

  • Trickle vents can be installed directly into the head of your door, removing the need for a frame extender

  • 20mm or 40mm frame extender profiles if required

  • Available in black, white or dual colour, they deliver 2500mm2 of airflow per vent

Next to each configuration diagram, you will see a number that indicates its opening options (e.g. 4-3-1).

The first number refers to how many door sashes are included within the set.
The second number indicates how many of those doors open to the left, with the final number representing the doors that open to the right.

The doors that feature traffic handles (standard door handles) are master doors which provide both internal and external access.

Shootbolt handles (indicated as a single vertical line) allow the sliding door sashes to be locked in place from the inside only. Door configurations that have just a shootbolt handle do not provide any external access.

  • Available in any BS or
    RAL colours
  • Doors up to 6.5m wide
  • Height up to 2.5m
  • Each sash up to 1.25m wide
  • 1-7 sashes
  • Multiple configurations
  • Doors open in or out

Low Maintenance:

What you need to know

Korniche is synonymous with quality and our bi-folding doors deliver in every respect of their manufacture and design.

From scratch and weather-resistant powder-coated aluminium to the bearing guided rollers, each detail has been crafted to be as low maintenance as possible. All that’s required is the occasional clean to ensure the door’s tracks are debris free.

High-quality bespoke hardware ensures your door handles maintain their great appearance during day-to-day operation. At the same time, the system’s Yale locking barrel, FUHR lock and Korniche shoot-bolt handle provide security peace of mind.

Powder Coating

The bi-folding doors’ powder coated exterior doesn’t just offer a wide range of colours, it also delivers a thicker, more consistently smooth coat when compared to standard finish.

Powder coating results in an extremely durable finish and is also much kinder to the environment.


We offer more than 150 colours in matt, satin or gloss, including the option to have different colours on the inside and outside of the frames.

This gives you greater freedom to match both the interior and exterior style of your property.

Useful Downloads

Do you have any questions?


Unit 12, Barton Hill Trading Estate, Herapath Street, Barton Hill, Bristol BS5 9RD

Follow Us

Copyright © 2024 Lons Bi-Folds