Composite Door Designer
Design the door that's right for you, choose from thousands of designs.
We make it easy for you to choose the exact door you want.

Design your own Door
Why choose a bi-fold door from DNK?
• Door fully assembled for easy installation
• Thermally broken top and bottom aluminium tracks improve
thermal efficiency and reduce condensation
• Utilises Sigenia gearing
• Available in a range of finishes with either white or brown tracks
• Lower thresholds for ease of access as there is no need for
bulky add-ons
• Sealing weather strips conceal unsightly gasket lines
to complete the professional look of the door
• Rigid aluminium tracks increase structural strength meaning the
door is easier to transport and prevents excessive flex to ensure
that the doors run smoothly, even on long spans with multiple
door configurations.

Available in the following colour options:

The above colours are designed as a guide to the Artisan Woodgrain Collection.
Before making your final decision, please ensure you have seen a foil swatch.
Cherrywood on White
Golden Oak
Golden Oak on White
Mahogany on White

Diagram Code Maximum width Diagram Code Maximum width

220 1.8m
321 2.7m
330 2.7m
431 3.6m
440 3.6m
532 4.5m
541 4.5m
550 4.5m
633 5.4m
651 5.4m
660 5.4m
Simply select your door height, width, hardware choice, sill, finish and configuration and your door will be delivered to you ready for installation.

Installation Support

We will help you every step of the way and have produced a detailed installation guide - this will accompany your delivery.
How the configurations work,
1st Number = Total number of Door Leaves
2nd Number = Number of door leaves opening Left
3rd Number = Number of door leaves opening Right

Full Range of Bifold Doors here
What is a Composite Door?
Doors are one of the most important items in any house. They are the primary source of security from both the worst elements of the weather, and would-be burglars trying to force their way in. They are the barrier that protects a family from the dangers outside. Because of this, it is important that when choosing a new door - be it front, back or side - it is a high quality one, fitted correctly.
So you may have heard of a “composite door” in your travels. This is because the composite door is now probably the most popular type of door sold in the UK right now. But knowing exactly what a composite door actually is might be a different matter. So here's the breakdown as to what a composite door is, and why they are one of the best door products on the market right now.

GRP Doors are Composite Doors

Composite doors have 'skins'. These skins are made from GRP (glass reinforced plastic) and is one of the most durable and strongest materials used in the door market. GRP is also used on fishing boats in the North Sea it's that good! The GRP skins are compressed moulded in order to give them their realistic wood grain effect. One reason why composite doors have become so popular is because of their realistic timber finish, but without the maintenance and disadvantages that timber doors bring.

GRP skins are now available in any RAL colour. Just like the old timber doors, which used to be painted in all manner of colour and style, modern day composite doors come in just as many colours as they can be sprayed to your choice. For those looking for a traditional looking door with traditional colours, this is a key element.

Composite Door Slab

The door slab is what most people consider the “door”. It's the part that sits in the outer frame and is what really sets a composite door out from the rest of the other products on the market.

A composite door “slab” is typically 44mm deep, with other options thicker than this. Compare this to the 28mm deep panels in a traditional PVCu panel door, the 44mm door slab brings with it many advantages.

A 44mm deep slab will keep in more heat in the a door the is 28mm. The thicker something is, the harder it is for heat to escape to the outside. But it's what inside that makes the biggest difference. Composite doors are commonly reinforced internally with a mixture of timber, CFC free polyurethane insulating foam and recycled PVC. It is these materials which give significant weight and strength to the door slabs, making it incredibly difficult for burglars to break them down. No other type of door is reinforced like this, which again has made them a popular choice with people looking to upgrade to new doors.


U-Values are how heat loss is measured. The lower the U-Value, the better that particular product does in keeping valuable and precious heat in. Composite doors, due to their wider construction and heavy reinforcement, achieve very low U-Values.

The focus on energy efficiency and heat loss has grown year on year and is an issue that will only become more important in the future. Composite doors, because of their excellent heat insulation properties, will play a big part in keeping the homes of the United Kingdom warm.

Full selection of Composite Doors

Top 5 Composite doors Styles

Top 5 Front Door Styles

The front door is often the first impression or at least a big part of that first impression. The right front door gives off the impression of a well-tended, stylish and secure home. To get this, you need to find a door that is durable and easy-to-clean or low in maintenance, so that it will remain looking good without too much effort. It will need to be in a style that suits the rest of the home, as well as looking good in itself. Lastly, it needs to be made from strong materials so that it doesn't appear flimsy or easily weakened.

Composite Door Style #1 - 2-Panel-2-Glazed-Composite-Doors

The 2-Panel-2-Glazed-Composite-Door is probably one of the most popular composite doors due to its simple design, which allows it to fit unobtrusively in many different styles of home. The design can be personalised by choosing different colours or different glass designs to fit in the two rectangular windows.

Composite Door Style #2 - 4-Panel-1-Half-Composite-Doors

The 4-Panel-1-Half-Composite-Door is a very smart design, with a range of glass options. Many people opt just to have a one glass in the front door - which is an arch or a wheel window at the top. Allowing light in without anyone being able to see in. Others opt for the 3 glass (2-Panel-3-Glazed-Half-composite-doors) - which has two rectangular windows and an arch at the top.

Composite Door Style #3 - 2-Panel-2-Glazed-Eyebrow-Composite-Doors

The 2-Panel-2-Glazed-Eyebrow-Composite-Door composite door has two arched windows, giving it a softer look than the Style #1 above.

Composite Door Style #4 - 2-Panel-Half-Glazed-composite-doors

The 2-Panel-Half-Glazed-composite-door has a large apeture of glass, due to this it is a very popular door choice for back doors

Composite Door Style #5 - 4-Rectangle-composite-doors

The 4-Rectangle-composite-door is getting more and more popular because of its modern look, the 4 Rectangles allow light in the property but still giving enough privacy, There are also a good selection of glass design to suit everybody

Full selection of Composite doors

Protecting your home

Beating Burglary, Securing Your Doors and Windows

Doors - the advice:

  • Lock all doors and windows, and ensure any PVCu doors are locked properly by lifting the handle and using the key to double-lock them.

Doors - the technical bit:

  • PVCu and aluminium doors should have multi-locking systems. Additional mortice deadlocks and/or key operated throw bolts can be fitted to provide additional security and reduce the leverage points.
  • Always lift the handle and lock with a key to prevent burglars reaching in through the letterbox to open the door. Internal letterbox cages and shields also help to prevent car or house keys being fished through the letterbox.
  • Wooden front doors should be solid timber, with a British Standard 5-lever mortice lock one third of the way up and an automatic deadlocking latch rim one third of the way down.
  • Wooden back doors should be solid timber, with a BS 5-lever mortice lock and two mortice rack bolts.
  • Frames can be reinforced with metal strips called ‘London’ and ‘Birmingham’ bars.
  • Hinge bolts should be fitted to outward opening doors.
  • Glass panels in doors should be replaced with laminated glass of reinforced internally with security film or grilles.
  • When moving into an older home, consider changing the locks on your doors to make sure that you have the only keys.
  • If you have a door entry system, make sure that it is used properly.

Windows – the advice:

  • Make a habit out of checking that ground floor windows are closed and locked when you go to bed. Upstairs windows should be locked when the house is unoccupied.

Windows – the technical bit:

  • Window locks which are visible from the outside may deter thieves because the lock forces the thief to break the glass and risk attracting attention. Thieves are reluctant to climb over broken glass.
  • Window handles should be multi-locking, with shoot bolts into the frame If not, surface mounted key operated window locks should be fitted (warranty permitting) to provide additional security and reduce the leverage points.
  • Don’t forget window locks for both sashed and hinged windows are available from DIY shops at a small cost. Get advice for the right lock for your style of window.
  • Pay particular attention to making sure that ground floor windows and windows that are accessible above flat roofs, close to drain pipes or in reach of fire escapes, are secure.
  • If you need advice, the names of local locksmiths who are members of the Master Locksmiths’ Association can be found in the telephone directory.
  • Patio doors should have a minimum of three locking points with an anti-lift device to prevent them from being lifted from their runners. Extra surface mounted patio locks can be fitted to provide additional security.