Bifold doors are a type of sliding door consisting of multiple panels that fold and slide along a track. When closed, bifold doors have the appearance of a glass wall, but they can be folded away to create a much wider opening than a typical patio door.

This allows you to maximise natural light, provide seamless indoor-outdoor access, and create a more open, spacious feel in a home or building.

Bifold doors are commonly used in kitchens to create a seamless connection between indoor and outdoor spaces. Minimal Frame Projects have vast experience of installing kitchen bifold doors in and around London. We'd be delighted to help make your dream of a light, airy kitchen into reality!

kitchen bifold doors connecting to same level patio

Enhance your home or office with Bifold External Doors

Balancing Natural Light and Energy Efficiency

Bifold external doors are a practical choice if you want to add a feature that lets in natural light and offers a view, while still maintaining good energy efficiency. They provide the benefits of a wide, open space and natural illumination without significantly compromising the insulation of your home.

Our glass and aluminium bifold doors are designed to provide good insulation against the external elements. They have U-values of 1.65W/m²K for double glazing and 1.41W/m²K for triple glazing. These numbers indicate how well the doors keep heat inside your home. Lower values mean better insulation, so these doors help maintain a comfortable indoor temperature, reducing the need for heating in winter and cooling in summer. This helps save on energy bills while still enjoying the benefits of natural light and a wide-open view.

In addition to the low U-values of the glazing, the frames of these bifold doors are made from thermally broken aluminium. This means they contain a ‘thermal break,’ which is a section of insulating material that prevents heat transfer.

The Air Aluminium Bifold Door System is one of the most versatile systems we offer. Produced right here in the UK, these bifold doors can be configured with up to 10 individual doors, are available in multiple RAL colours, and offer many customisation options for handles, locks, glass, and cills. The Bifold Door System can also be set up with single or multiple opening doors in various locations - we even have a matching side door to complement the range.

Flexible Solutions: Custom Bifold Doors for Any Space

These bifold doors can cover a wide range of spaces, including very large openings. Each panel is made to measure and can be up to 3 metres high and 1.2 metres wide. They can be configured with up to 10 panels, making them suitable for openings up to 3 metres high and 12 metres wide!

Minimal Frame Projects are leading bifold door suppliers throughout Surrey, West London, and the surrounding areas. Contact us today to discuss your plans.

Call Minimal Frame Projects on 020 7550 6550

  • 77mm Frame
  • 100's of Colours
  • 10 Year Guarantee
Air Bifold Features Include:

SL Air Aluminium Bifold Doors: Technical Specification


Product Type Glazed Bifold Patio Door
Range SL Air Bifold Door System
U Values 1.65W/m2K (Double Glazed)
1.41W/m2K (Triple Glazed)
Maximum Panel Height 3000mm (please enquire if you would like to go larger than this)
Maximum Panel Width 1200mm (please enquire if you would like to go larger than this)
Glazing Options Double or triple glazed argon filled toughened safety glass
Cill 150mm, 190mm, 220mm
Frame Depth 77mm
Finish Powder coated Aluminium.
Can be painted any RAL colour. Dual colour available (lead times on request)
Frame Material Thermally broken aluminium
Beading Internally Beaded
Lever Handles Standard lever and rose handle or Designer Purity handles
D Pull Handles Black only
Flap Pull Handles Robust standard style or Designer Purity handles
Guarantee 10 Year Product Guarantee
Security Standard cylinder or option of anti bump, anti snap cylinder.
Master doors with high security multipoint lock.
Get a Quote for
SL Air Aluminium Bifold Doors
  • Custom manufactured to meet your requirements
  • Up to 10 pane configuration available
  • 77mm aluminium frames
  • Glass height up to 3000mm per pane
  • Glass  width up to 1200mm per pane
  • Internal Beading
  • Powder coated aluminium in multiple colours
  • Double and Triple Glazed options
  • Multi point locking system
  • U Values from 1.41 W/M²k
  • Also available in matching single door
  • 10 Year Product Guarantee
XS: Mobile
SM: Tablet
MD: Laptop & iPad
LG: Desktop & iPad Pro
XL: HD Desktop