SUNFLEX UK Aluminium Bi-fold Doors

For over 35 years, SUNFLEX has led the way in the global design and manufacturing of industry-leading aluminium bifold doors.

With the enhanced requirements of Building Regulations, the SUNFLEX SF75eco offers the ideal combination of advanced thermal performance and stunning appearance. When stacked back, the doors allow you to bring the outside in, creating completely unobstructed openings to connect your home and garden. When closed, the advanced design and attention to detail help keep your home warm and the worst of the weather outside.

The SF75eco is manufactured with slender aluminium frames, featuring a patented 44mm thermal break, and is packed full of unique features not found on any other folding door on the market.

Like every SUNFLEX door, the SF75eco is handmade in a SUNFLEX factory, ensuring consistent manufacturing quality and genuine components throughout.

Designed to be the most thermally-efficient bifold door, the SF75eco offers Passivhaus standard thermal performance and is specifically manufactured to accommodate a triple glazed sealed unit, and thanks to its advanced thermal break technology it can achieve an incredibly low U-value from just 0.8W/m²K† (based on a centre-pane of 0.5W/m²K) whilst maintaining the same usability and slender appearance that SUNFLEX doors are renowned for.

Every SUNFLEX product is manufactured to strict standards of child safety. The SF75eco features an exclusive anti-slam panel catch and finger cushioning gasket. Unlike typical magnet designs, the SUNFLEX panel catch completely secures the lead door in place preventing the doors from being blown shut by the gusts of wind or from being operated by small children.



Superb energy efficiency: With U-values from just 0.8W/m²K no aluminium bifold is more thermally efficient.

Advanced security protection: Carries prestigious Secured by Design™ award and exceeds requirements of PAS 24:2016 testing.

Aesthetic appeal: Slender frames and panels up to 3000mm high and up to 1200mm wide to maximise glass.

Industry-leading performance: Capable of superior water tightness (900Pa – Class 9a*) and air permeability (600Pa – Class 4*) testing performance.


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