Warmcore aluminium bi-fold doors

Concertina sliding doors, with thermal cleverness built-in.

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Aluminium, with something special up its sleeve

The Warmcore aluminium folding sliding door system does something quite special, keeping your home warmer than the standard alternative. Its technical design is based around a high-performing thermal core, meaning its streamlined good-looks work hard to keep your home warm. A standard double glazed option can achieve a U-value of 1.5 W/m2K, with 1.0 W/m2k achievable with 44mm triple glazing. That’s impressive stuff.

It looks great on the outside, but something radical is going on inside. With slim sight lines, energy efficiency, effortless rollers and unbeatable weathertightness, it’s an innovative way to transform your home, without compromise. 

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Low cost finance available. 0% APR Representative.

Available on orders over £3,000. Pay just 10% deposit today.

Other finance options available.

Our guarantee

We’re not just backed by our customer’s recommendations. Our products are made to the highest standards.

We’re also backed by a 10-year manufacturer’s guarantee. We’ll cover the cost of any necessary replacement if the damage isn’t your fault. Because if you’re not happy, we’re not happy.

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Happiness is about getting the colour just right

Sometimes, it’s what’s on the outside that counts.

That’s why you can choose to have a different colour inside and out. We offer a range of colour choices from standard white to anthracite grey. Download our brochure to see the full range of options available.

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Let's talk technical

The beauty of WarmCore is in the details:

  • Triple-sealed door leaves eradicate draughts
  • Bespoke union mouldings for gaskets
  • PAS24 and Secure by Design compatible
  • Flexible threshold options
  • Strength and security approved by UKAS laboratory testing
  • Double-strength sash corners
  • Custom-engineered extruded aluminium hinges
  • ERA Five Star Guaranteed
  • Innovative clip-in bead design
  • 4 colours available - white, grey cream and black.
  • Superior energy efficiency. WarmCore is 25% more efficient at keeping heat in your home than traditional aluminium doors.
  • Hi-tech elegance. Just because something is innovative, doesn’t mean it can’t look aesthetically beautiful, WarmCore is proof of that.
  • High strength construction. The aluminium construction make it inherently strong and secure giving peace of mind to you and your family.
  • Multi chambered thermal core. At the heart of WarmCore products is market-leading thermal performance thanks to the multi-chambered insulating core aluminium bar.
  • Fresh, clean design. With clean modern lines WarmCore is refined and perfectly suited to modern architecture as well as replacement projects.

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The happier way to new windows and doors.