DUO Composite Doors

Strong, secure and stylish, double-rebated entrance doors

As one of the first things people who visit your home will interact with, the ideal entrance door will provide a great first impression and combine strength, security and longevity with a beautiful aesthetic style and colour scheme.

Whether you have time-honoured and traditional tastes or might prefer a contemporary and cutting-edge, the Duo range of double-rebated composite entrance doors is the answer for those searching for the perfect front door for their home.

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Attention to detail

Whether you prefer time-honoured and traditional, or contemporary and cutting-edge, you can choose a door style to suit you and your home. The choice of colour glass, furniture and finish means there are thousands of possible combinations. You can even complement your door with matching side panels, sidelights and toplights.

The Duo composite door range from Window Wise has been designed with symmetry and style in mind; each one is built in Britain and finished with the attention to detail you would expect, using the strongest, low-maintenance materials. Thanks to their sharp woodgrain definition, they are virtually indistinguishable from a traditional timber door, but have a range of modern advantages. The tough GRP skin means your door will withstand extreme UV testing, so it will not fade in strong sunlight.

A well-made, well-chosen door will improve not only the appearance, but also the value of your home, so give us a call and ask to see the Duo range today.

Thousands of colours & styles to choose from

The Duo range of composite doors comes with a choice of 30 door unique door styles, materials and glazing options.

Plus, thanks to RAL colour matching your Duo entrance door can come in any one of 15,000 available shades, with a 10 year guarantee on the longevity on any colour used.


A Duo door built just for you

The collection is divided into three categories, based on your budget and type of property:

  • The Foundation Collection for the most popular and budget-friendly designs
  • The Rural Collection for rural or period homes
  • The Contemporary Collection for modern homes

Once you’ve finished, send it direct to Window Wise to receive a free, no-obligation quote for work.

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Key features

Features and benefits

DUO Composite Doors

  • Steel reinforced 70mm PVC-U outerframe extruded to BS EN12608 specifications
  • Double compression seals for better insulation
  • 68mm thick construction 54% thicker than a standard door (strong and more secure)
  • Environmentally friendly high density, CFC-free, polyurethane foam core
  • Steel reinforcement for added strength
  • Thermoset GRP skin, with natural woodgrain effect. Low maintenance
  • Strong colour fastness, UV tested to withstand strong sunlight, less prone to fading

A stylish welcome

Composite doors offer the look and feel of a traditional timber door with a huge range of additional benefits.

These British Built modern, low-maintenance alternatives to wooden or PVC doors will never rot, swell, crack, wrap or need repainting. They can be personalised to suit both your home and your taste with a wide variety of styles, colours, glazing and furniture options.

Your front door is the first thing to greet any visitor and a well-selected door can not only improve the look of your home and increase its security and energy efficiency, it can also raise the value of your property.


Every Duo door is double rebated as standard, to help you keep the heat inside where it belongs. Not only does this help the enviroment, it saves money on your heating bills too.

Double rebates make the weather seal more resistant to the elements and more effective than their single rebate equivalents. The construction of each Window Wise Duo door means it is 54% thicker than a standard door, making it far more effective at retaining heat. Each door in the range also has double compression seals where the door meets the frame – so you have two additional barriers to keep heat in, and cold draughts out!

The energy-efficient performance of a door is now measured in a ratings scheme from ‘A’ to ‘G’. The DSER (Door Set Energy Rating) for all Duo doors is ‘A’, meaning they offer the highest possible levels of energy-efficiency and heat retention.

Triple glazing is available in glazed Duo doors, further improving thermal and acoustic insulation.

Safe and sound

From start to finish, Duo doors are designed and manufactured in the UK to meet or exceed all current British Standards. These include PAS23, PAS24 and ‘Secured by Design’ – the official Police security initiative.

‘Secured by Design’ is only awarded to products which offer exceptional security features. The flagship scheme recognises products which incorporate effective crime prevention solutions at the design stage; the accreditation is only awarded to products which pass stringent testing.

The Duo range makes use of the most reliable, trusted technology and hardware in the industry. Each door has been designed to provide a formidable barrier against even the most determined intruder – so you know that all your visitors will be by invitation only!

The high quality sub-frame is individually constructed to match every door size exactly, without ‘cutting it down to fit’ and has galvanised steel reinforcement in both the door frame and outer frame. The Duo door combines strength and stability with robust joints locking everything tightly in place.


The double rebate of each Duo door not only helps lower your heating bills, it also helps you leave the stresses of the outside world behind when you close the door.

Your home will be a quiet and relaxing haven, closed off from the sound of traffic and noisy neighbours thanks to the Duo doors’ high density core. Because each door in the range is 54% thicker than a standard door, you can expect much more peace and quiet.