Bi-fold Doors By Greenoaks

Bring the Outside in with Bi-fold Doors

Greenoaks Prestige bi-folds can help soften boundaries, creating an increased sense of space and a seamless transition between your garden and the inside of your home.

Slim, elegant, aluminium ensure light bathes interiors, even when doors are closed. Giving you bright airy interiors no matter what style or configuration of Prestige bi-fold you choose.

Featuring Our Unique Thermal Technology

Clean, crisp lines on the outside hide away our innovative Thermlock ®  multi-chamber thermal design, helping keep you and your property well insulated against the worst of the UK weather. Their insulating chambers act as a thermal break and work in conjunction with high performance glazing to create class leading thermal performance, far superior to traditional polyamide thermal breaks.

Balanced Aesthetics

Custom designed single rollers eliminate the need for floating mullions. Ensuring that whatever your style of door, our bi-folds have consistent 138mm sightlines between sashes, creating our trademark balanced look.

Outstanding Security Built Into Every Bi-fold

With 5-point locking and double deadbolts, every element of the Prestige bi-fold has been designed to keep you and your home secure. We also use full length security interlocks on appropriate styles to protect your home from would-be intruders. These bind the sashes tightly together if attacked.

BespokWinkhaus 'Thunderbolt' Locking

French passive doors include an integral finger pull lock, eliminating the need for a second handle – continuing the clean, minimal Sheerline aesthetic. An innovative mishandling device also ensures doors are locked in the correct order.

Open Up Your Home

Bi-folding doors should maximise the light flooding into your home, and the enjoyment of your garden or patio. Bringing an improved sense of space and creating panoramic views that can transform interiors.

Configurations

Up to 7 panes wide in a variety of styles. Depending on the layout of your room you can choose to have your doors split, left and right, or have them all sliding to one side. Think about Including a single ‘traffic’ door in your configuration, as it’s a great way to create an everyday entrance for when the weather’s not so good.

Also available as single and French Doors.

Threshold Options

Four threshold options all feature fully weather-sealed rebates that keep the worst of the British weather safely outside. These rebates also ensure doors aren’t over-centred during operation, helping locks to engage correctly. Our doors also feature clever concealed drainage, eliminating the need for unsightly drainage cover caps.

Over 3000 Potential Colour Combinations

White. Cream. Rosewood. Chartwell Green. Irish Oak. Anthracite Grey. The fenestration industry has witnessed a revolution of colour throughout the last decade – and it shows no signs of stopping. The days of property owners requesting a full suite of white windows with matching white doors and a conservatory are much less prevalent than before.

Order forms are now filled with requests for windows foiled in all colours of the rainbow, with woodgrain, patterned or shimmer effects, many wanting two different colours for frame and sash.

We’ve entered the age of personalisation at every level – and homeowners are demanding more choice than ever – so what if we told you one PVCu systems company is able to offer almost 3,330 different colour combinations within just 7 days, with thousands more on longer lead times?

Greenoak Concept & Design

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Greenoak Concept & Design have been raising the standards for more than 14 years.

More about us: We’re an independent Essex-based specialists in high quality UPVC Windows, Doors, Tiled Conservatory Roofing, Wall Cladding, and Fascias, Soffits and Guttering.

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Bi-fold Doors Frequently Asked Questions

Yes. Every Prestige bi-fold is fitted with 5-point locking and double deadbolts as standard. On appropriate styles, we also use full-length security interlocks that bind the sashes tightly together if attacked.
Our bi-folds are available up to 7 panes wide, in a range of configurations — split left and right, or all sliding to one side. You can also include a single ‘traffic door’ within the configuration, giving you an everyday entrance for when you don’t want to open the full set.
Yes. Our bi-folds feature Thermlock® multi-chamber thermal technology, which acts as a thermal break and works alongside high-performance glazing to deliver class-leading thermal performance — far superior to traditional polyamide thermal breaks.

Our composite doors achieve A-rated insulation as standard, thanks to the thermal polyurethane foam core, with an A++ rated triple-glazed option available for even better heat retention.

Both have their benefits. Bi-folding doors let you open up the whole entrance aperture, which is great on a summer’s day and adds real impact to a room, though they do have more frame. Sliding patio doors only open up to 50% of the entrance but have less frame, allowing more light through.
Greenoaks bi-folds offer almost 3,000 colour combinations within a 7-day lead time, with thousands more available on longer lead times, from classic white and Anthracite Grey to woodgrain finishes.

Thank You For Your Continued Support

Due to high demand, we are now accepting bookings for December 2026 installations, with our diary also open for 2027 projects.
As a special thank you to both our new and existing customers, we’re offering an exclusive: