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4 Pane Aluminium Bifold Door

Our sleek and modern 4 Pane Aluminium Bifold Doors from Alunet are handcrafted to our customer’s specifications using our class-leading Bifold Door System.

The Aluna Aluminium Bifold Doors are engineered for elegance and performance, featuring marine-grade PAS24 security and Part L compliant U-values as low as 1.1 W/m²K when paired with triple glazing. With a DER Rating of B, these bifold doors offer outstanding energy efficiency and lasting durability. The super-slim 107mm sightlines maximise natural light and provide stunning, uninterrupted views. Perfect for contemporary homes, the Aluna system blends refined aesthetics with superior functionality — creating bright, open spaces that seamlessly connect your indoor and outdoor living.

 

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Design Your Aluminium Bifold Door

 

Fancy something different? We also offer different sash options:

From £2,660.45£2,217.04 Inc. VATEx. VAT

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Our sleek and modern 4 Pane Aluminium Bifold Doors from Alunet are handcrafted to our customer’s specifications using our class-leading Bifold Door System.

The Aluna Aluminium Bifold Doors are engineered for elegance and performance, featuring marine-grade PAS24 security and Part L compliant U-values as low as 1.1 W/m²K when paired with triple glazing. With a DER Rating of B, these bifold doors offer outstanding energy efficiency and lasting durability. The super-slim 107mm sightlines maximise natural light and provide stunning, uninterrupted views. Perfect for contemporary homes, the Aluna system blends refined aesthetics with superior functionality — creating bright, open spaces that seamlessly connect your indoor and outdoor living.

Fancy something different? We also offer different sash options:

Size

2800 X 2100, 2800 X 2300, 2900 x 2100, 2900 x 2300, 3000 x 2100, 3000 x 2300, 3100 x 2100, 3100 x 2300, 3200 x 2100, 3200 x 2300, 3300 x 2100, 3300 x 2300, 3400 x 2100, 3400 x 2300, 3500 x 2100, 3500 x 2300, 3600 X 2100, 3600 X 2300, 3700 x 2100, 3700 x 2300, 3800 x 2100, 3800 x 2300, 3900 x 2100, 3900 x 2300, 4000 X 2100, 4000 X 2300, 4100 x 2100, 4100 x 2300, 4200 x 2100, 4200 x 2300, 4300 x 2100, 4300 x 2300, 4400 X 2100, 4400 X 2300, 4500 x 2100, 4500 x 2300, 4600 X 2100, 4600 X 2300
Ventilation

No Trickle Vents, 1 Trickle Vent, 2 Trickle Vents, 3 Trickle Vents, 4 Trickle Vents
Configuration

0 + 4, 4 + 0, 1 + 3, 3 + 1, 2 + 2
Cill

No Cill, Integrated Cill
Glass

Clear Toughened
External Colour

Anthracite, Black, White
Internal Colour

Anthracite, Black, White
Handle Colour

Same as frame colour, Black, Grey, White
Opening Direction

Open in, Open out

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Innovative Aluna Bifold Door System

The Aluna aluminium bifold doors redefine open-plan living with configurations of up to 14 panels, opening inwards or outwards from either side. Designed for flexibility, the moving corner post enables seamless right-angled openings, blending indoor and outdoor spaces effortlessly. Engineered hardware ensures smooth, reliable operation for a premium, long-lasting finish.

Design Your Aluminium Bifold Door

Sleek, Stylish & Versatile

  • Super slim 107mm sightlines maximise glass area for uninterrupted views.
  • Cutting-edge design with a wide choice of stylish finishes and colours.
  • Large sash sizes up to 1200mm wide × 3000mm high per pane.
  • Exceptional efficiency – U-values as low as 1.1 W/m²K (triple-glazed) and 1.4 W/m²K (double-glazed).
  • Click-and-forget clip-in beads for effortless installation.
  • 120kg heavy-duty wheel hardware ensures smooth, reliable operation.
  • PAS24-certified marine grade aluminium for lasting security.
  • Fully colour-matched to Aluna sliders, windows, and roof lights for a cohesive look.

Design Your Aluminium Bifold Door

Profile & Features

Our Aluna bifold doors feature innovative Click & Forget clip-in beads for fast, effortless installation. Designed for precision and flexibility, these beads securely snap into place—no tools or excessive force required. This clever design not only reduces installation time per pane but also delivers a satisfying “click” for complete confidence. With Aluna’s advanced profile system, installers enjoy speed, simplicity, and a flawless finish every time.

Design Your Aluminium Bifold Door

Innovative Universal Lock Keep

Our Unique Universal Lock Keep is expertly designed with fabricators in mind, offering a smarter, more efficient solution. Suitable for both left- and right-hand doors, it eliminates the need to stock separate lock keeps—saving time, space, and reducing errors. Easily adjustable with an Allen key, it features a single screw type, plastic alignment packers for quick fitting, and a wider faceplate for extra strength. Diecast back boxes and reduced hook box depth ensure seamless compatibility and reliable performance.

Design Your Aluminium Bifold Door

Colour Options for Aluna Bifold Doors

Our Aluna bifold, French, and single doors are available in any RAL colour to perfectly match your project. Standard stocked finishes include Grey 7016 (Matte), Black 9005 (Matte), White 9016 (Gloss), Grey 7016 on White 9016, Black 9005 on White 9016, Textured Grey 7016, and Mill Finish. Custom colours can also be requested for a truly bespoke aluminium bifold door design that complements any style or space.

Design Your Aluminium Bifold Door

Technical Performance

  • Market-leading maximum sash size of 1200mm x 3000mm
  • Slim 107mm sightlines for modern, minimalist aesthetics
  • PAS24:2022 compliant for superior security
  • Supports glazing thickness up to 44mm
  • U-values as low as 1.1 W/m²K, DER B-rated for Part L compliance
  • Weatherproof to BS6375 Part 1:2009
  • 73mm frame depth for strength and performance
  • Single or dual colour marine-grade powder coating (Qualicoat approved)
  • Handles up to 120kg per leaf for large openings
  • Smooth, durable rollers for effortless operation
  • Air permeability: Class 4 (600 Pa)
  • Water tightness: Class 9A (600 Pa)
  • Wind resistance: Class A3 (1200; 1/150)

Design Your Aluminium Bifold Door

Frequently Asked Questions

The Aluna bifold system offers exceptional benefits including enhanced security, industry-leading thermal performance, superior weather resistance, and effortless installation. With its market-leading sash size, homeowners enjoy maximum visibility and uninterrupted views of their outdoor space while benefiting from a sleek, contemporary design.

Yes. The Aluna bifold system delivers outstanding thermal efficiency, achieving Part L compliant U-values as low as 1.1 W/m²K when paired with energy-efficient glazing. This ensures superior insulation, helping homeowners reduce energy bills and maintain a comfortable indoor temperature all year round.

Absolutely. The Aluna bifold door system is PAS 24 accredited, offering top-tier protection. Combined with AluLock multi-point locking, Sweet Handles, and Ultion 3-star cylinders, the system provides anti-snap, anti-drill, and lockdown protection, making it virtually impenetrable without heavy tools — the ultimate in bifold door security.

Our standard colour options include White (RAL 9016), Anthracite Grey (RAL 7016), and Black (RAL 9005). Dual colour finishes such as Grey Out/White In and Black Out/White In are also available. For bespoke projects, any RAL colour can be custom powder-coated upon request.

The Aluna bifold system supports market-leading sash sizes up to 1200mm x 3000mm, allowing for larger, more impressive openings and panoramic views without compromising strength or performance.

Optional upgrades include the Duplex Double Hook Lock (6-point locking), low threshold options (20mm standard, 20mm rebate, or ramped), and a floating corner post for dramatic, fully open right-angled designs.

Yes. Every Aluna bifold system comes with a 10-year manufacturer’s guarantee, ensuring long-lasting peace of mind.

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