• Technically advanced framing systems with slim sight lines
  • Simplified fabrication for fast fabrication times
  • KTW51 window system
  • Leading design
  • Highest quality materials
  • Excellent weather resistance
  • Easy installation for any glazier
  • Natural ventilation system
  • Full KBS system compatibility
  • Powder coating options available
  • Anodising finish available also
  • Variety of colours and sizes


All bi-fold doors are painted and coated with high quality, long lasting paint that is designed to last the test of time, hence why we are able to offer a 10 year guarantee inclusive of all bifold door orders. All finishes are first class with low maintenance attached, subsequently, your bifold doors will only require a quick wipe down once or twice per annum.


Gives a lovely finish to any house and home, being a neutral shade it combines with almost all colour schemes that you have in situ. Smart and practical you can’t go far wrong with white.


Classic and classy, the dark smart shade also goes with almost all other colours that you have in your home. Adds that really smart solid affect against your other finishes.


So if you’ve considered the white and black but they don’t grab you, then grey’s going to be the shade for you. Stylish and also sits alongside almost any other colour you have.

WARRANTY25 Year Bifold Door Warranty purple - Bi-Fold Doors

All colours come supplied with a 10 year warranty for long term reassurance. Only the highest quality materials are used which are professionally applied by experienced industry experts. Hence the ability to offer a 10 year warranty on all colour options we apply for you.


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As we are the manufacturers of our own range of products, when it comes to selecting glass for your bifold doors, any preference is possible. We can accommodate your requirements across your chosen selection, whether you wish to maintain a more traditional single glaze look and feel or whether you would prefer a more modern, energy efficient and more secure solution such as double, treble or even quadruple glazed bifold doors. Either way, we can help advise and guide you on the best option for your home, however, our standard double glazing solution looks really great – high quality, secure, easy to clean and very energy efficient too!

All our doors and windows have been submitted to the United Kingdom Accreditation Service (UKAS for short!) to gain the all important Industry standard PAS 24 accreditation, this involves a rigorous testing procedure at their independent testing facility. This ensures that the product meets and gains the PAS 24 – Part of The British Standard stable of excellence and minimum security requirements (previously the BS7950) and assesses the security performance of the glazing for windows and external doors against possible forced entry and intrusion by an unwanted ‘visitor’. We are confident in all of our products, special attention is paid to good design, safety and security so you can be sure of purchasing a truly quality product.

We invite you to our lovely showroom in Colchester where you will be advised and guided through the various options by one of our knowledgeable and friendly assistants. We are here to help so don’t hesitate to either call us or drop by – You will be amazed at the variety, the quality and the shear beauty that a Bifold door brings to your home.

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All bifold doors manufactured, built and assembled by Bifolds Bidesign are fully energy efficient meeting the highest attainable energy efficiency ratings for fixed windows. Subsequently, if you want care for your home and eco friendly warmth all year round, why look anywhere else, other than Bifolds Bidesign for high quality bi-folding doors.


At Bifolds Bidesign, we only believe in quality products that will last. After All, this is why so many customers recommend Bifolds Bidesign to friends and family. As the company motto suggests – ‘Because We Can’ we take full pride in our work and have the leading industry experts in house.

If you are by any means concerned or wish to see the hardware used for your fixed windows for yourself, then please come in and visit us at the Bifolds Bidesign showroom in Colchester, Essex. We would love to show you the high quality of all our products.


Whether you live in a small or large property and regardless of where your home is situated within your neighbourhood even with the best neighbours in the world, we all worry over the security of our homes. They are our nests, where we raise our families and need to be as secure as we can possibly make them with particular emphasis when it comes to windows, doors, lanterns and bifold doors.

These are the weak points for any house and can become the entry points of any unwantedbifolds 3 - Bi-Fold Doors ‘visitor’. Our industry has responded with the introduction of the PAS 24 (2012) Security Standard, this is the line in the sand of the very minimum basic security requirements as dictated by the United Kingdom Accreditation Service (UKAS for short!) So the door, window and lantern manufacturer submits their product and is granted this ‘fit for purpose’ standard. These measures have proven to be so effective in stopping intruders that the Police Service has had to plan differently when they are executing a warrant and making an arrest by forcing entry to the house of a suspect. Comforting information indeed and should go a long way to allaying any fears and worries you may have over the security of your home.

This is the very reason why we specialise in bifold security to ensure a force of entry is not possible other than through extreme instances which are almost impossible to prevent. As a company, we pay particular attention to security across all our product range and truly believe that we sell the most secure and highly tested bifold door solution on the market and we welcome you to put this to the test by visiting our showroom in Colchester, Essex.

WINKHAUSbifolds 18 - Bi-Fold Doors

Established over 160 years ago, the Winkhaus group is renowned as one of the best security mechanism manufactures worldwide. Experts in security, we work with this globally recognised manufacturer to ensure all tilt and turn window security systems that we install are highly regarded as the best in it’s class, as we only believe in the very best. ‘Because We Can’. If you want to learn more about Winkhaus visit their website, as you will see they are based in Kettering of the UK. Winkhaus is a company we are happy to be associated with in terms of quality and heritage and this is why we use their high quality products for most of our manufacturing processes, which are proven to be consistent here in the UK.

YALE SECURITY LOCKSbifolds 3 - Bi-Fold Doors

Almost everyone has heard of Yale and if not, then you will have almost certainly used one of their door or locking systems. Yale is yet another well respected company which we are proud to confirm we work with by using their products throughout most of our manufacturing processes as well. Subsequently, if you love to buy quality products, then look no further than Bi-Folds Bi-Design based in Colchester, Essex, UK. “Because We Can”.

THRESHOLDShome para - Fixed Window

At Bifolds Bidesign we offer multiple threshold options to suit the style, design and build of your property. Subsequently, regardless of whether you are looking for a more traditional, slightly larger, more chunky threshold to match other windows or to reduce costs, we can cater for your needs. If however, you would like an ultra stylish, slim threshold, again, we can cater to meet your requirements as we manufacture all thresholds here in the UK. We also invite you to come in and visit our showroom in Colchester, Essex. This way, you can compare options yourself and receive free advice on what may work best for you.


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At Bifolds Bidesign we offer multiple threshold options to suit the style, design and build of your property. Subsequently, regardless of whether you are looking for a more traditional, slightly larger, more chunky threshold to match other windows or to reduce costs, we can cater for your needs. If however, you would like an ultra stylish, slim threshold, again, we can cater to meet your requirements as we manufacture all thresholds here in the UK. We also invite you to come in and visit our showroom in Colchester, Essex. This way, you can compare options yourself and receive free advice on what may work best for you.


There are many options available to you when it comes to configurations. At Bifolds Bidesign we do not believe in limits and this is why we offer as many configuration options as possible to meet and suit your every need or requirement.

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Were you aware that we also offer integral blind installation…Integral blinds are fantastic as they are incredibly easy to keep clean, very simple to operate and there is no rattling or knocking in the wind in addition to looking ultra stylish. Ensure to tell us if you would like integrated blinds added to your order as we can ensure this is provide to you.

For full configuration possibilities, visit our easy to access showroom based in Colchester of Essex to go through all options with our friendly team. Our team members are very proactive, courteous, polite and very happy to help. If you would like to visit us, here is the address to our UK based showroom – Flyover Nurseries, Coggeshall Road, Marks Tey, Essex CO6 1LJ

If you would prefer to go through this over the phone, then please call us on 01206 212 040 as we offer many configuration options which are fully available to you. Subsequently, please call us over the phone and or send us an email as one of our team members are here to help you at anytime on 01206 212 040 or by sending an email to


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Top and Side Hung Applications.
Polyamide thermally broken aluminium frames, for improved thermal efficiency.
28mm glass, as standard.
Joined using mechanical corners.
75mm polyamide sub frame section, for easy to install modular windows.
Easy clean and egress options available.
Cills, add ons, curtain wall insert and coupler sections available.


  • Narrow Sight Lines.
    Technically advanced framing systems with slim sight lines.
  • Easier Fabrication.
    The KTW51 Window System is fabricated using a mechanical corner cleat, which ensures easy and fast fabrication times.
  • Meeting Project Requirements.
    The KTW51 Window Suite is available in both 51mm profile sections.
  • Architectural Flexibility.
    The systems can be used for punched hole, composite and ribbon window applications. Also, both new build and refurbishment schemes.
  • Efficient Drainage.
    The window system is fully drained, either onto a cill section or with our innovative face drain cap. This includes an internal baffle, to stop wind noise, and to minimise the build-up of water, creating excellent weather resistance.
  • Easier Glazing.
    The Window Suite can be dry glazed from the inside or out using clip-in beads for ease of fabrication and faster glass replacement.
  • Natural Ventilation.
    Trickle ventilation to Building Regulations can be integrated into the KTW51 Window System.
  • Full KBS System Compatibility.
    The KTW51 Window Suite can be fully integrated into the Exlabesa curtain walling to naturally ventilate the building and offer additional aesthetic options.
  • Finish & Furniture.
    The KTW51 Window Suite can be produced in single and dual Polyester Power coated colours and also an Anodising finish is available. The window furniture includes espagnolette and cockspur options in a variety of colours.
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Aluminium is extruded in accordance with
BS EN 755 Part 1-9:2008 and BS EN 12020-2:2008.
Polyester Powder Coating material is produced in accordance with
BS 6496/97:1984.
Silver Anodising is produced in accordance with
BS EN 12373, ranging from 5-25 microns.
Polyamide Thermally Broken Aluminium is produced in accordance with
BS EN 14024:2004.
Gasketry is produced in accordance with
BS EN 3734:1997.


Security tested to BS 7950:1997.

Weather tested to BS 6375-1:2009.

Test certificates available upon request.

Max. Vent Top Hung Size (mm) Typical U-Values
1200 x 1200 1500 x 1500
KWS75 Casement 1500 x 1500 1.64 / 1.47 1.54 / 1.40
KWS75 Sub Frame 1500 x 1500 1.63 / 1.46 1.54 / 1.39
Please note: U-Values are dependant on size and glass U-Values. The above are based on glass U-Values of 1.1 W/m2K.

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Yale logo - Fixed Window
Fensa Logo - Fixed Window
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uk logo2 - Fixed Window


Registered Office:

71 - 75, Shelton Street, London, WC2 9JQ

Company Number: 10733676

Tel: 01206 212040