uPVC Window close up

Slimmest on the market

Designed and manufactured in our Watford factory, the AB-38 bi-folding door has a glazing thickness of just 28mm, allowing maximum natural light and making it unrivalled in the market. Slimline bi-fold doors are right on-trend now, and demand is soaring for sleek aesthetics, superb sightlines and unobstructed views, giving open access to your outdoor space. The AB-38 ticks all these boxes and more, and we expect it to be a hit with installers and homeowners around the Home Counties and all over the country.


Key Features

Slimline System

Ultra-slim glazing, giving superb sightlines

High Performance

Outstanding thermal efficiency, with a u-value of 1.1 W/m2K

Innovative Design

Dual colour options, plus access to 200+ RAL colours

Strong & Secure

Heavy duty quadruple stainless steel rollers, assisting smooth sliding on bottom rail

Fitting Options

Two threshold options available for fitting – rebated or level threshold

Discreet Ventilation

Quadruple locking of intermediate vents.

AB-39 Slimline Bifold Door in Modern Home
  • Finishes & Materials
  • Thermal Efficiency
  • Accessories
  • Safety & Security
  • Technical/Downloads

Finishes & Materials

RAL Colour Picker


The AB-38 bifold door is finished in a durable powder-coat paint. White, grey, and black are classic colour options while for a unique appearance you can offer your customers any of over 200 RAL colours. All powder-coat finishes are extremely low-maintenance and come with a 20-year guarantee.

Obsidian Black
Frost White
Velour White
Province Green
Antique Green
Amazon Green
Desert Grey
Olive Green
Platinum Grey
Antique Grey
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Aluminium & Materials

The AB-38 bifold door uses only premium-quality aluminium. Aluminium is an inherently strong material which is weather-resistant and thermally-efficient. It is also extremely versatile and compatible with an endless array of product designs and specifications.

Thermal Efficiency

Bifold Doors Locking Mechanism

Thermal performance

The AB-38 bifold door has been tested to ensure that it meets current building regulations for thermal performance. Our aluminium bifold doors can help to:

  • Reduce heat loss
  • Protect against condensation
  • Enhance energy efficiency
  • Lower energy usage
  • Promote sustainability


Door Accessories


Our AB-38 bifold door is available with a selection of hard-wearing and attractive accessories. When you want to offer your customers the best in bespoke customisation, it’s important to use the best accessories to complement your aluminium doors and windows. Our AB-38 bifold door can be specified with the following accessories.

  • High strength Bogie rollers
  • Stainless steel track system
  • Choice of contemporary and traditional handles
  • Powerful door magnets
  • Low threshold options

Safety & Security

Bifold Close Up

Safety & security

Our AB-38 bifold door is designed with safety and security in mind. Alongside our anti-finger trap gaskets, our AB-38 bifold door provides the following protection.

  • High security multi-point locking systems
  • Strong and secure frames
  • Robust hinges
  • Heavy duty shoot bolts
  • Magnetic door keeps


Technical & downloads

Click on the links to download all the essential technical product documentation. Visit our download page to browse the technical details of all our aluminium doors and windows.

View All Downloads


AAA Guarantee Cover


AAA Cleaning Cover

Powder Coating Cleaning

Heritage Doors with side panels

Outstanding Thermal Efficiency

The AB-38 is also extremely thermally efficient, boasting a U-value of just 1.1 W/m2K, and comes with quadruple locking of the intermediate vents, greatly improving security and weather resistance. In addition, the door has heavy duty quadruple steel rollers that contribute to smooth operation, along with adjustable jambs for easier sash alignment.

The bifold is suitable for residential and commercial properties, and available in more than 200 RAL colours. Our introduction of the AB-38 seals our reputation as a company with excellent flexibility that responds quickly to shifting market demand, supplying installers with desirable customer-focused products.

Bifold Doors Close Up

Features & benefits of AB-38:

Minimalistic styling

You can integrate AB-38into your minimalistic design without compromising on robustness. The slim aluminium sightlines add visual quality in terms of the connection with the exterior, improving overall aesthetics.

Embrace Natural Light

The design of AB-38 folding door system is all about maximizing the natural light into your space, offering slim sightlines (88 mm aluminium face width, sash to sash). If you’re looking for an eco-friendly way to keep your space bright, AB-38 is an ideal choice.

Spectacular Performance at All Fronts

The system achieves top performance in terms of air permeability (class 3), watertightness (8A) and wind load resistance (class 2), offering an all-around reliable solution. There are also enhanced levels of burglary protection, with quadruple latches, 3-point locking and a special anti-lift mechanism.

A Folding Door System that Raises the Bar

The AB-38 sets a new standard for thermally insulated folding door systems. Whether you want to install a new one or upgrade an existing system, AB-38 is a fantastic solution. Its top performance and unmatched aesthetic appeal tick all the boxes!

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Boost your business by becoming an Aston installer today. Gain access to all our premium aluminium products and offer your customers a smooth and efficient installation service on bespoke aluminium doors and windows.

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