Solarlux bi-folds vs other well-known brands - what’s the difference?20. February 2020

A boost of natural light and seamlessly linking the home to the garden. These are just a couple of the reasons the bi-fold door has become so popular throughout the country for well over a decade. The expansive feeling that comes with bi-fold doors has also been known to increase the value of your home.

Solarlux Bi-Folding Doors

As with any home investment, there’s a vast amount of information to pick through to find the ideal product for you. So how do Solarlux bi-fold doors compare to other well-known brands in the UK?


Thermal Efficiency

The most commonly used measurement of thermal efficiency in bi-fold doors is U-value. This measures a bi-fold doors thermal transmittance and its unit of measurement is W/m²K. The lower the value, the better a product is at retaining heat. Bi-fold doors from a well-known brand in the UK can achieve a U-value of up to 1.2 W/m²K, whereas Solarlux bi-fold doors, such as the Highline model, can achieve a U-value as low as 0.8 W/m²K.

The profile of our bi-fold door holds the key to its thermal efficiency. A multi-functional thermal break does more than just keep your home a comfortable temperature. This expertly crafted feature houses the locking mechanism and gives the door strength, allowing you to move panels weighing more than 17 stone (110 kg) with a little more than a gentle push.

Well-known UK brand: up to 1.2 W/m²K

Solarlux: up to 0.8 W/m²K


Opening and Sightlines

“Sightline” is a term that will come up repeatedly when comparing the best bi-fold doors available on the market. A sightline is the gap between the two panes of glass in the door. The slimmer the sightline, the more light that is allowed into the room. One of the UK’s well-known bifold door brand can offer a sightline of 110mm.

Our doors, such as the Ecoline model, offer a sightline of 99mm, giving you practically unobstructed views of the outside world. Solarlux bi-fold door panels can also be folded into a slender bundle when open. Customise the door to your home by choosing the number of glass panels, the door’s folding direction (left or right) and even if they open in or out. 

Well-known UK brand: up to 110mm

Solarlux: up to 99mm


  Well-known UK brand Solarlux
Thermal efficiency up to 1.2 W/m²K up to 0.8 W/m²K
Sightline up to 110mm up to 99mm

RAL colours

Dual colour option

Woodgrain finishes

RAL colours

DB colours

Eloxal colours

Dual colour option

Specialty surface finishes (such as matt, gloss or Tiger)

PAS 24

PAS 24


Secured by Design



Despite the slim sightlines, you can rest easy knowing that you’re protected by the Solarlux bifold doors. Our multi-point locking mechanism is concealed within the door’s frame, offering the home high levels of security. Bi-fold doors from a well-known UK brand meet the UK minimum security standard, PAS 24.

Not only do Solarlux bi-fold doors meet PAS 24 but they are also compliant with RC2, the European security testing standard. Select products from the range are certified by Secured by Design (SBD). The SBD initiative started in the late 1980s, calling for stricter regulations and testing standards. Since its inception, there has been an 87% reduction in overall burglary in new homes.

Well-known UK brand: PAS 24

Solarlux: PAS 24, RC2, Secured by Design



A well-known UK bi-fold manufacturer offers an array of colour options such as choosing from 150 RAL colours. Solarlux believes in putting the power in your hands by offering full creative freedom, giving you the perfect opportunity to inject your individuality or match your home to its surroundings.

Our dual colour option allows you to pick one colour to match the exterior of your home and a different one to complement its interior. The colour is applied to the door in our in-house coating plant, which is one of the most advanced in Europe, to ensure a perfect finish.

Well-known UK brand: RAL colours, Dual colour option, Woodgrain finishes

Solarlux: RAL colours, DB colours, Eloxal colours, Dual colour option, Specialty surface finishes (such as Tiger, matt or gloss)



We use high-quality aluminium and wood in our range of bi-fold doors. The wood featured in our bi-fold door range, such as the Combiline door, is certified to be sourced from sustainable forestry by the PEFC and FSC. Our environmentally conscious approach extends to the production process with the use of water-based finishes and the recycling of water and heat to conserve natural resources.

Aluminium is inherently a durable and sustainable material, making it perfect for use in bi-fold doors. Our aluminium production process is certified in accordance with the German A.U.F. Recycling Loop, which confirms our commitment to sustainability and that our aluminium is recycled in an environmentally conscious manner.



Protruding floor tracks can be a trip hazard for little ones and can affect a homes accessibility. Our bi-fold doors can come with a completely flush floor track, suitable for any living space. We offer impact protected floor track LED lighting that not only adds an ambience to a room but can act as an orientation aid for the visually impaired.

Award-Winning Solarlux Bi-fold Door

Solarlux is proud to have received numerous international awards for our bi-fold door range, including a 2019 German Design Award for our Woodline bi-fold door. For more information about our bi-fold doors or any of our other premium home improvement products, contact us online.

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Solarlux Systems Limited
5 Quadrant Park
Welwyn Garden City,

Tel: +44 1707 339970



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