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WarmCore Bi-Fold Doors

  • Sleek Lines
  • Beautiful Aesthetics
  • Strong Construction
  • Unparalleled Security

Warm, secure and beautiful aluminium-hybrid bi-folding doors

Built around a belief that beauty doesn’t have to compromise performance, WarmCore aluminium-hybrid folding sliding doors were created out of a desire to combine the desirability and durability of aluminium with unparalleled insulation.

Bi-Fold Doors Explained

The orange thermal core - hidden away in the finished doors - is key to why WarmCore doors are 25% more thermally efficient than traditional aluminium systems.

Strong and secure, WarmCore doors come with class leading security built in, backed by a comprehensive 10 year product guarantee, reinforced by the ERA Five Star security guarantee. Inwards or outwards opening doors up to 6m wide, with as many as 7 opening sashes glide along custom designed tracks. While a wealth of colour, style and configuration options help you choose the perfect warm, secure and beautiful WarmCore door for your home.

Bi-Fold Door Options

Available in a choice of 15 powder coated colours and 6 woodgrain foils, WarmCore allows you to pick a different colour for each side of your door - at no extra cost.

Pure White

Anthracite Grey


Lavender Haze

Telegrey 4

Telegrey 2

Dusty Grey

Slate Grey

Jet Black

Deep Saxe Blue

Light Admiralty Grey

Pebble Grey

Traffic White

Smoke Grey


Light Oak

Ginger Oak

Honey Oak

Monument Oak



Download a Bi-Fold Door Guide

View more benefits, styles, colours and much more.


Bi-Fold Door Benefits

External sash styling

A choice of 4 external aluminium door sash designs, ranging from a contemporary pencil round to a decorative sculptured look, enables you to personalise your door or echo the style of your existing windows.

Graceful handles

WarmCore door handles gracefully curve around door sashes when open, tucking into the glass reveal and allowing the door sashes to fold perfectly flat.

3 finishes

Available in 3 hard-wearing finishes, anodised Matt Black and Satin Silver or Brushed Graphite, choose the perfect match to complement your door.

Traditional option

A high-security lever handle is also available, tested to PAS24 standards like the rest of the range. Available in Silver, Black and Brushed Graphite.

Threshold options

WarmCore doors come with a range of threshold options, including ultra low Part M compliant aluminium thresholds that help avoid trip hazards.

Neat stacking

Meticulous design and discreet magnets ensure open door sashes run in parallel and stop door sashes ‘clattering’ when in the open position.

Your Next Steps

Why choose us
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Got a question? Call us on 0116 403 0279

You can also email our team of experts on enquiries@customtradesystems.co.uk

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