SKU: Sierra-Bi-Fold

Sierra Bifold Doorset


Bi-fold doorsets offer a combination of functionality, versatility, and aesthetic appeal, making them a popular choice for creating expansive openings and providing stylish solutions connecting indoor and outdoor spaces.

Indoor-Outdoor Connectivity: Bi-fold doorsets are commonly used to create a seamless transition between indoor and outdoor living areas such as gardens, patios, decks, and poolside areas. When fully opened, they provide an unobstructed view and easy access to the outdoors, enhancing the sense of space and openness.

Space Optimization: Bi-fold doorsets are designed to fold and stack neatly to one or both sides of the door opening when opened fully. This folding mechanism allows for maximum space utilization, making them ideal for areas with limited indoor or outdoor space.

Flexible Configuration: Bi-fold doorsets consist of multiple panels that are hinged together. Depending on the design and configuration, they can be folded inwards or outwards, allowing for various opening options to suit different preferences and spatial constraints.

Enhanced Natural Light and Ventilation: Similar to sliding patio doors, bi-fold doorsets often feature large glass panels that allow ample natural light to penetrate indoor spaces. When partially opened, they also provide ventilation, allowing fresh air to flow into the building.

Versatile Design Options: Bi-fold doorsets come in various designs, materials, finishes, and configurations to complement different architectural styles and interior décors. They can be customized with features such as grid patterns, decorative glass, and hardware finishes to achieve a desired aesthetic look.

Accessibility: Bi-fold doorsets offer easy access for individuals with mobility challenges, as they require minimal effort to operate. This makes them suitable for use in residential homes, commercial buildings, and public spaces where accessibility is important.

Energy Efficiency: High-quality bi-fold doorsets are designed with energy-efficient features such as insulated glass, thermal breaks, and weatherstripping to minimize heat loss or gain. This helps improve indoor comfort and reduce energy costs associated with heating and cooling.

Security: Bi-fold doorsets are equipped with secure locking mechanisms and hardware to ensure the safety and security of the building. Options for multi-point locking systems and toughened glass provide added protection against intrusions.

Additional information

Glazing Thicknesses

Double = 26mm , Triple = 44mm

Sound Reduction

Rw 38dB Rw+Ctr 32dB

Water Tightness

Class 5A, EN12208

U Value's

1.1W/m²K up to 1.4W/m²K

Frame Dimensions

Depth: 133mm (timber) or 141mm (aluminium clad)
Minimum Width: 1690mm
Maximum Width 1200mm (per panel)
Minimum Height: 1600mm
Maximum Height: 2500mm
Maximum Weight: 600kg
* Values shown above may be subject to change based on type of glazing selected

PAS24: 2016 Compliant


Colours (Ironmongery)

Satin chrome, polished chrome, white, black.



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SKU: Sierra-Bi-Fold

Sierra Bifold Doorset


As standard we advise that you allow for approximately 8-10 weeks from signing off your order. To confirm our current lead times, give us a call on 01324 673250.

Most of our systems can be supplied with both double and triple glazing. However, in the majority of instances double glazing is the preferred option. For more information and to determine which is best for your project, please contact us to arrange an appointment with a consultant who can explain the main differences to you.

Secured by Design (SBD) is the official police security initiative that works to improve the security of buildings and their immediate surroundings to provide safe places to live.

SBD’s product-based accreditation scheme – the Police Preferred Specification – provides a recognised standard for all security products that can deter and reduce crime.  This includes domestic windows and doors, and the components within them such as locks, hinges etc.

Janex is a registered member of Secured by Design and many of our products have been tested to meet the demands of the standard.

A U-Value, in simple terms, indicates how well your window will be at retaining the internal heat within your property and preventing it from escaping to the outside.  U-Values are measured in Watts per square metre, or W/m2 K. The lower the U-Value number, the better the heat retention of the window. All new or replacement windows require a minimum U Value of 1.6 W/m2 K. 

Ask your Janex consultant for further details and they’ll be only too happy to help.

We offer composite timber front and back doors. There are many different styles, colours and specifications when it comes to choosing between these three products. We recommend speaking to one of our Janex consultants or visiting our showroom in order to understand the differences in more detail.

Yes, in most instances you will be able to choose a different colour on the inside of your product to the outside, so for example you could have white inside and red outside.  Or, yellow one side and black the next! A Janex consultant will be able to help you confirm your choice is available.

Replacing your old windows with new double or triple glazed windows will typically add value to your property. Not only do new windows look aesthetically pleasing to the eye they also increase the thermal efficiency in your home keeping you nice and toasty in winter and keep the heat out in the warmer months making double or triple glazed windows an essential decision factor to many potential purchasers.

It is very rare that you’ll need permission to replace your existing windows and doors. However, you will need to check to see if you are located in a conservation area as you may be restricted with what designs or materials you are allowed to use this may also be the case if your property is a listed building.

Absolutely! All of our windows and doors are made to measure and can be tailored to your requirements. This includes choosing from a range of colours, finishes and styles.

‘Engineered’ timber is the key to the strength and long-lasting properties of our windows and doors. It is created through a very old technique of layering wood sections with the grain of one section in the opposing direction to the grain of its neighbour.

Explore Our Products in Real Environments

View a selection of our windows installed in completed jobs.