Bi-Fold Doors

Flexible living

The attraction of a door that simply folds out of the way is undeniable.  It’s a boon when entertaining, and it’s wonderful on a balmy summer evening. But a bifold that isn’t well built can spell trouble. The forces and the weight are considerable which is why our doors are ideal. Crystal’s doors have all the strength a bifold needs and packs a real punch with its ultra-slim sashes. Because it includes full-length thermal break technology in its sections, they are also highly insulating. The tough polyester powder coating resists damage from scuffs and day-to-day knocks.

The doors can be configured to your exact needs and is a fabulous example of great engineering. Its components include double hinge fixings for reliable long-term performance, multipoint locking to the main door and shootbolts for high security. There’s also an outstanding track and roller system that’s easy to operate and maintain, ensuring they are always reliable and always ready to impress.

Features and Benefits

  • Mulitple options including left, right and both sides stacking
  • Choice of access door
  • Wide choice of handle colours
  • Up to Door Set Energy Rating C
  • U-values as low as 1.1W/m2K
  • Suites to other window and door systems
  • 28mm double glazing as standard
  • Slim slightlines
  • Multipoint locking for the main door and shootbolts for high security
  • Parallel stainless-steel tracks for ease of operation and stability
  • Quad stainless-steel rollers with wiper brushes to spread the load and resist debris build-up
  • Robust corner cleat system for strong precise corners
  • Weather performance to BS6375-1
  • Meets Building Regs without foams or special polyamides
  • 10 year mechanical performance guarantee
  • 25 year surface paint finish guarantee
  • Lifetime security guarantee on hardware


All aluminium sections are finished with a tough, durable polyester powder coat, certified to the Qualicoat standard, which surpasses European requirements. The finishes need next to no maintenance – just a quick wipe down to remove surface dirt. For more challenging environments, we can also supply special marine-grade finishes

All products come with the following benefits

Energy Efficient

Marketing leading thermal performance


End of life products are given a new lease of life via recycling


Manufactured to the highest quality standards, fully accredited and CE  Marked


Lifetime security guarantee on hardware