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About Our Bi-Fold Doors

Aluminium bi-folding doors have seen a huge increase in popularity in recent years. Offering a seamless blend between an inside living space and the garden, bifolds are the door of choice for aspirational homeowners and should be an essential addition to any glazing installer’s product portfolio.

Through our partnership with leading systems company AluK, we manufacture and supply the hugely popular Optio BS70 bifold door, which comes complete in a wide choice of colours (including dual colour) and configurations.

The Optio BS70 ticks all the boxes from a performance perspective, achieving a 1.4 U-value to meet the recently reviewed 2022 Building Regulation requirements and meets PAS24 security credentials.

But one of the main benefits of sourcing aluminium bi-folding doors from Central is the service. We have a wealth of technical knowledge behind the scenes from people who have worked in the aluminium industry for decades, meaning you can take on complex projects with confidence, and we strive to offer on time and in full deliveries, helping your project run as smoothly as possible.

Bi-fold door sizes and configurations

Our aluminium bi-fold doors are available in a wide range of sizes and configurations to suit many different applications and space.

The maximum leaf height is 2400mm and the maximum width is 1200mm, with a maximum vent weight of 100kg. the system is internally beaded with a glazing thickness of 28mm-40mm.

Panels can be stacked to the left or the right, inside or out or split stacked on both sides. The system also boasts a unique flush line pop-out handle that allows for square flush stacking panels when doors are fully open.

Aluminium bifolding door
  • Product Options
  • Design Features
  • Performance
  • Ultion Key Tag

Product Options

  • Chamfered and square bead options
  • Glazing 28mm – 40mm
  • Available in a range of opening configurations
  • Available with heavy duty rollers; BSF70 HD
  • Doors and panels can be used in a variety of configurations, style
  • and design
  • All configurations are available in both open-in and open-out options
  • Full range of bespoke hardware available
  • Available in single or dual colour option, polyester powder coating andanodised finishes

Design Features

  • Internally beaded with a softline or square detail to all external doors
  • and panels
  • Chamfered and square bead options
  • Four stainless steel wheels ensures smooth and consistent operation
  • Unique, flush line pop-out handle that allows maximum door opening
  • and square stacking panels
  • Low threshold option which can be configured to achieve DDA and
  • Part M compliance
  • Certified under Secured by Design scheme
door handle


Folding sliding

  • U-Value (Double Glazing) – 1.7
  • U-Value (Triple Glazing) – 1.6
  • Acoustic performance – Rw (C;Ctr) 36 (-1;-3) dB
  • Air Tightness (Pa) – Class 4
  • Water Tightness (Pa) – Class 7a
  • Wind Load (Pa) – PAS 24

Single & double door

  • U-Value (Double Glazing) – 1.8
  • U-Value (Triple Glazing) – 1.4
  • Acoustic performance – Rw (C;Ctr) 36 (-1;-3) dB
  • Air Tightness (Pa) – Class 4
  • Water Tightness (Pa) – Class 7a
  • Wind Load (Pa) – PAS 24
black bifold aluminium doors

Ultion Key Tag

Never lose your keys again with the Ultion KeyTag. This excellent addition to any of our doors makes it so homeowners will never have to worry about searching through drawers, pockets, or purses again for their keys. 

  • Get notifications when you leave the key behind
  • Sound an alarm to find keys easily
  • Multiple colour options available
  • Compatible with the Apple Find My app
AluK aluminium bifold doors open

Why Choose Central Window Systems?

Experience Matters

With a wealth of experience and knowledge, we are a stable company who will be here to support you in the years to come.

Highest Quality

Exceptional product quality is a prerequisite at Central Window Systems. We offer the most advanced window and doors available on the market.

Professional Standards

Delivering products to you on-time, in full and in pristine condition ensuring your professional installation is completed with the support you expect from your supplier.

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