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Ashfen 
Windows & Doors
  • Home
  • Windows
    • Sliding Sash Windows
    • Flush casement windows
    • Windows
  • Doors
  • Aluminium
    • aluminium-bifold-doors
    • sliding-patio-doors
  • Conservatories
  • Contact Us
  • Gallery
  • Testimonials
  • News and updates
  • FAQs

Sliding Patio

Get a Free Quote

Aluminium Bifold Doors Manufactured in Derbyshire

We're excited to introduce our new WarmCore aluminium bifold door system, fabricated locally in Derbyshire.

WarmCore combines the strength and elegance of aluminium with outstanding thermal performance, delivering slim sightlines, enhanced security and impressive energy efficiency without compromising on style.


Designed for modern extensions, renovations and open-plan living, WarmCore bifolds create bright, spacious interiors while seamlessly connecting your home with the outdoors.

Why Choose WarmCore Aluminium?

Traditional aluminium systems have always offered exceptional strength, durability and contemporary aesthetics. However, earlier generations of aluminium frames often struggled to achieve the levels of thermal performance homeowners now expect.  Moving forward this will be a minimum requirement for new builds and renovations alike.


While many systems rely on thermal breaks to reduce heat transfer, WarmCore was designed from the outset with energy efficiency at its heart.


By combining a high-performance insulated core with premium aluminium outer skins, WarmCore delivers impressive U-values, excellent structural integrity and beautiful slimline aesthetics in one innovative system.


Stunning Aluminium BiFolds


    The Benefits of WarmCore

    Outstanding Thermal Performance

    Outstanding Thermal Performance

    Outstanding Thermal Performance

     Exceptional insulation helping to reduce heat loss and improve comfort. 

    Slim Sightlines

    Outstanding Thermal Performance

    Outstanding Thermal Performance

     Maximise glazing areas and natural light. 

    Enhanced Security

    Outstanding Thermal Performance

    Enhanced Security

    Advanced locking systems and robust construction. 

    Low Maintenance

    Manufactured in Derbyshire

    Enhanced Security

    Powder-coated aluminium requiring minimal upkeep. 

    Manufactured in Derbyshire

    Manufactured in Derbyshire

    Manufactured in Derbyshire

    Locally fabricated and installed by Ashfen. 


    BiFold configurations

    Our Most Popular, Flexible Configurations to Suit Your Project

    3 Panel (3-0)

    Ideal for smaller openings and garden rooms. 

    4 Panel (4-1)

    Probably the most popular layout for kitchen extensions because it gives an everyday traffic door. 

    4 PANEL (2-2)

    Symmetrical opening from the centre. 

    5 Panel (5-0)

    Works well for wider openings while retaining a traffic door.

    6 Panel (3-3)

    Excellent for large contemporary extensions and gives a balanced central opening.  

    7 Panel (6-1)

    Excellent for large open spaces onto gardens because of the quick access traffic door.

    We have other configurations available. Please contact us for details.


    Colours & Finishes

    WarmCore aluminium bifold doors are available in a wide choice of colours and finishes, from contemporary Anthracite Grey and Jet Black to classic White and bespoke RAL options. Whether you're creating a modern extension or renovating a traditional property, WarmCore offers the flexibility to achieve a truly personalised look.


    Finished with a high-quality powder coating for exceptional durability and weather resistance, WarmCore bifold doors are designed to retain their appearance for years to come while requiring very little maintenance.


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    Get a Free Quote


    Contact Us

    Or drop us a whatsapp

    We love our customers, so feel free to get in touch on the above form or using the Whatsapp button below.

    Whatsapp us about Aluminium

    aluminium@ashfenwindowsanddoors.co.uk

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    Ashfen Windows & Doors Ltd

    Unit 15, Dunstall Park Road, Derby DE24 8HJ

    01332 224305 / 07415 743692

    Copyright © 2026 Ashfen Windows & Doors LTD. All Rights Reserved

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