To create a seamless connection between your home and garden, choose from these designs featuring the latest materials and technology
As well as connecting your home to your outside space, bi-fold doors are a very practical addition to your property, and can be double-glazed or triple-glazed for extra thermal efficiency. Current building regulations (Part L) state that for refurbishment or extensions to existing dwellings, new glazing should achieve a maximum U-value of 1.8W/m²K or lower. Most new bi-fold door products on the market surpass these standards, providing greater insulation.
A huge range of systems are now on offer, including aluminium, timber, composite and uPVC. Each material has its own benefits: wood has a traditional appeal, aluminium has slimmer frames for a modern look, while uPVC tends to be the less expensive choice.
1. Slimline frames
With an impressively minimalist 5cm-thick frame made from lightweight aluminium, these Ultra Slim doors from 4 Season Doors & Rooflights are designed to maximise sightlines to the outdoors. Available in double or triple glazing, a standard door system achieves a U-value of 1.63W/m²K. The doors are manufactured in the UK and have a short lead time, plus a 10-year guarantee. An integral ‘lock out’ track enables the door system to be opened anywhere along its run and bolted for security.
9. Natural look
Kloeber’s engineered timber folding-sliding doors are available in bespoke or standard sizes, with a selection of stains on offer. The doors can be supplied either double- or triple-glazed and have a low U-value, plus they are accredited by Secured by Design — a UK police initiative aimed at reducing burglary by ‘designing out crime’.
10. Secure design
Manufactured with an interlocking profile to prevent potential intruders from prising open the panels, and offering thermal and weather performance that has passed hurricane-force conditions, the SL60e system from Solarlux has been created with strength and security in mind. Despite the sturdy, well-insulated design, however, the folding-sliding glass door system features extremely slim frame sections. The U-value of the doors can be as low as 1.1W/m²K, dependent on the configuration and glazing chosen.