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Bi-Folding Door
Our high performance, easy to install door.
Ultra-slim frames, low U Value and short lead times – all from JUST £445 per leaf
48 Aluminium Bifolding Doors
JUST Aluminium have developed the 48 aluminium bifolding door based on the incredibly popular Alunet slimline system. The 48 offers market leading performance whilst remaining exceptionally strong and durable.
Ultra-slim frame
The JA-48 is one of the slimmest door frames on the market today (48.5mm frame width) with a sightline (the point two frames interlock including a 10mm gasket) of just 107mm. We can create bifolds up to 2600mm in height (we can offer doors up to 3000mm in height with a 55mm frame width) and a sash width of up to 1200mm in width – we can even create systems up to 14 door panels.
Exceeds UK Building Regulation standards
With engineering grade hardware, the doors effortlessly open and close with a reassuringly functional and robust feel, providing an underlying sophistication and premium quality. The JA-48 exceeds UK building regulations delivering an incredibly low U-value of 1.4 with a double glazed unit (LowE, toughened 1.2 U value as standard). With a simple glazing upgrade (6.8mm toughened 1.2 U value) and 3* Ultion locking cylinder, the JA48 doors will achieve PAS24. The JA48 system can also accommodate a 44mm triple glazed unit for those demanding even higher performing thermal and acoustic insulation (our 44mm glazed unit is rated at 0.6 U value).
Faster installation
The JA-48 comes with an integrated cill and weathered threshold as standard, minimising installation times and reducing the bottom frame by 25mm. This maximises the glass and enhances the streamlined appearance.
All available from only £445 per panel with UK delivery available*
Door Spec
- 48.5mm frame width (width viewed front on)
- 107mm super slim sightline (width where 2 frames meet viewed front on including 10mm gasket)
- U values of 1.4 (with our ultra-lowE 28mm double glazing)
- 44mm triple glazing available (glass unit rated at 0.6 U value)
- Frame depth of 73mm (distance between the front and back of frame)
- Up to 14 sashes (7 in each direction)
- Panel widths up to 1200mm per sash (700mm minimum) and maximum height of 3000mm Marine grade powder coated finish as standard
- Weather rated standard threshold with integrated cill only 55mm high (low threshold, low threshold with rebate options also available)
- PAS 24 security rated (with glass and locking cylinder upgrade)
- Engineering grade stainless steel rollers and track for ultra-smooth opening and closing
- Easy to install for faster, simpler installation
- High performance weather seals
Energy efficient as standard
We hold considerable stock of standard colours and options so can offer delivery in as little as 2 weeks from order (glazed) and even less unglazed. Furthermore, the JA-48 is designed to exceed UK building regulations, offering a U value of 1.4 with our double glazed unit and as low as 1.0 with a triple glazed unit. These impressive figures help to maintain a comfortable indoor temperature while reducing energy consumption and reducing heating bills. This feature contributes to energy savings and promotes sustainability.
Thermal performance is measured in terms of heat loss, and is commonly expressed in the construction industry as a U-value. The lower the U value, the better the insulating performance. Many other systems require triple glazing to meet a U value of 1.4 whereas the JA-48 achieves this with an ultra-low E double glazed unit.
For sashes over 2600mm in height we use a 55mm frame.
As standard, there is no external access (or natural traffic door) for even numbers of panels all folding in the same direction. Please raise this with the team if external access is required. If you’re unsure whether your order confirmation provides external access, then speak to us and we will confirm.
SLIMLINE FRAMES
With one of the slimmest frames available in the UK, Deluxe Bifolds lets you enjoy more natural light, a sleek modern look, and stunning views of your garden from the comfort of your home.
THERMALLY EFFICIENT
“Our JA48 bifolding doors at Deluxe Bifolds achieve U-values as low as 1.4, helping you stay warm and cosy even on the coldest winter days—while also saving on energy bills for years to come.”
SAFE AND SECURE
“All our doors at Deluxe Bifolds come fitted with a 1 Ultion (or equivalent) cylinder as standard, with the option to upgrade to an anti-pick, anti-snap lock that meets PAS 24 security standards—giving you ultimate peace of mind.”
Select your colour
At Deluxe Bifolds, we keep things simple—offering three popular standard colours: Anthracite Grey, Black, and White. While hundreds of RAL colours are available, 99% of our clients choose from these timeless options. We also offer dual-colour and custom finishes, but by stocking our core colours, we’re able to provide faster turnaround times without compromising on quality.
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ANTHRACITE GREY - RAL 7016
THE classic aluminium bifold door colour for that sophisticated ‘Grand Designs’ look. Our most popular colour choice
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JET BLACK - RAL 9005
THE classic aluminium bifold door colour for that sophisticated ‘Grand Designs’ look. Our most popular colour choice
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TRAFFIC WHITE - RAL 9016
“Perfect for those seeking a more sophisticated contrast or a bold, contemporary finish, this colour option adds a striking touch to any space.”
Choose a threshold
INTEGRATED CILL & THRESHOLD
Our integrated cill and low-profile threshold—measuring just 55mm in total height—delivers full weather protection while maximizing the sash height for a sleek design with more glass and less frame.
STANDARD THRESHOLD
Our standard 55mm threshold provides a full weather break, helping to keep your home warm and dry no matter the conditions outside. It’s the recommended choice for all external bifolding door installations.
LOW THRESHOLD
Our 20mm Low Threshold offers a sleek, seamless transition between spaces. While it provides less weather protection, it’s ideal for reducing trip hazards—making it a great option for families with small children or individuals with mobility needs.
LOW THRESHOLD WITH REBATE
A 20mm rebate can be added to our low threshold, increasing its height to just 40mm. The rebate lip enhances weather resistance for added protection against the elements. A ramped option is also available for improved accessibility.
Choose a handle
Handles – Choose the perfect finishing touch to complete your look. Our sleek, durable handle options are designed to complement any style, adding both function and flair to your bifolding doors.
Anthracite aluminium lever
Black aluminium lever
White aluminium lever
Chrome aluminium lever
Chrome aluminium lever
Glazing – simply the right choice
This advanced glazing is among the most energy-efficient options available in the UK, helping to lower energy bills by reducing heat loss in winter and reflecting solar energy in summer. The result? Cooler rooms in the warmer months and warmer spaces during colder seasons—all while saving energy.
With outstanding performance and sleek design, our bi-folds offer the perfect combination of efficiency, comfort, and style for any home or commercial property.
Key features of Low Emissivity glass
- Low E toughened glass enhances your home’s energy efficiency by offering a well-balanced combination of thermal insulation and solar gain. It helps reduce the energy needed to maintain a comfortable indoor temperature, making it an eco-friendly choice by lowering CO₂ emissions. The advanced coating minimises heat loss through the glass, helping to eliminate cold spots near windows and lowering heating costs. It also reduces condensation on the inner pane, improving comfort and visibility. With a neutral appearance in both light transmission and reflection, it delivers high performance without compromising aesthetics.