Sheerline Aluminium Bi-Folding Doors

Beautifully Balanced Bi-Folds to open up your home with natural light

Prestige Aluminium BiFold Door Systems

2 Styles, all great British performance

Introducing Sheerline

Building on years of experience, we’ve incorporated many new innovative ideas to create the Sheerline range of window, door, bi-fold and lantern systems. Creating warm, slim and ultra secure products, designed for discerning homeowners who aren’t willing to compromise. Built around our innovative Thermlock® multi-chamber thermal break, Sheerline windows use a patented construction method that creates the most beautiful, high quality finish possible. Stylish, safe and sustainable – and offered with unbeatable service levels – Sheerline is the right choice for homeowners

A range of Contemporary Colours

Prestige doors are available in eight powder coated matt colours, as well as a high gloss white with the option of choosing a different colour for the interior to help you find the look that is perfect for your property.

Traditional Pure White

RAL 9010 Matt

Traditional Hipca Gloss White

RAL 9910 Gloss

Traditional Anthracite Grey

RAL 7016 Matt

Traditional Jet Black

RAL 9005 Matt

Character Premium Cream

RAL 9001 Matt

Character Premium  Agate Grey

RAL 7038 Matt

Character Premium  Squirrel Grey

RAL 7000 Matt

Character Premium Pastel Turquoise

6034 Matt

Character Premium Brown

RAL 8017 Matt

Sheerline Aluminium BiFolding Doors All Open looking out to garden

Prestige BiFold Doors

Beautifully balanced bi-folds

Prestige bi-folds enable you to open up and transform your home. Providing that all important flexibility to enjoy your indoor and outdoor space as one. Combining the refined, architectural look of aluminium and the latest thermal and security technology, leaving you with beautifully balanced bi-folding doors

Sheerline Aluminium BiFolding Doors Closed Anthracite Grey Modern in Bungalow

Open up your home and fill it with natural light

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. They also need to offer reliable operation, while keeping heating bills low, and would-be intruders out. That is why we have designed our Prestige bi-folds to offer you the perfect balance of refined looks, exceptional thermal performance and outstanding operation. Building on years of experience, we’ve incorporated many new innovative ideas to create a refined aluminium system that’s ideal for discerning homeowners who aren’t willing to compromise

Unique Thermlock® technology provides exceptional thermal performance, while bespoke locking systems and our patented construction method provides unparalleled levels of security

These slim, perfectly balanced bi-folds are available in stepped and contemporary ‘flat-faced’ styles,  in configurations up to 7 panes wide

Sheerline Aluminium BiFolding Doors 3 Section Anthracite Grey Closed Internal

Bring the
outside in

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, equal 138mm sash-to-sash sightlines ensure light bathes your interiors, even when your doors are closed. Giving you bright airy interiors no matter what style or configuration you choose

Exceptional thermal performance with Thermlock® technology

Our innovative Thermlock® multi-chamber thermal design, hidden away inside each Prestige bi-folding door, helps keep you well insulated against the worst of the UK weather. These closed-cell, insulating chambers act as thermal breaks, working in conjunction with high performance glazing to create class leading thermal performance, far superior to traditional polyamide thermal breaks

Sheerline’s sills also feature this same technology coupled with innovative in-built weather sealing keeping draughts and rain safely outside

Quality components for flawless operation

Every element of the Prestige bi-fold  has been engineered to operate perfectly. One-piece stainless steel tracks in the head and threshold ensure smooth and reliable rolling of the sashes, while hinges rated to 120kg help keep every sash perfectly aligned during operation. No aspect of the door has been overlooked  and we even use unique tri-material gaskets that feature a low-friction coating for smooth performance and reliable sealing

Download or View the Brochure

Local Installations of Sheerline Aluminium Windows and Doors 


Minimum and Maximum Dimensions

StyleMin WidthMin HeightMax WidthMax HeightDesign Wind Pressure
Open In600mm1860mm1220mm2520mm800 Pa - 2400 Pa
Open Out600mm1860mm1220mm2520mm800 Pa - 2400 Pa


GlazingContemporary Stepped
Double Glazed 1.4u W/(m2K)1.4u W/(m2K)
Triple Glazed* 1.0u W/(m2K)1.1u W/(m2K)

*Subject to glass specification chosen