Casement Windows

More Facts & Stats on Our Casement Windows


Casement Windows Features & Functionsbifolds 24 300x300 - Casement Windows


  • 28mm glass throughout as standard
  • 55mm flazing is available
  • 75mm polyamide subframe section
  • Easy clean option available
  • Internal glazing available
  • Multiple colour options available
  • Top and side hung applications
  • Thermal efficiency
  • Economically efficient
  • Latest features and functions

[/tab1] [tab2]

Colours & Finishesarray

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 maintenence attached, subsequently, your bifold doors will only require a quick wipe down once or twice per annum.

[row] [span6]


Glacier white is widely regarded as the most popular colour option available as it is fresh, ultra modern, super clean and it transforms the front, rear and side view visual aspects of your home, regardless of what type of property you own. To see the most wanted Glacier white option in person, we advise you to come into our showroom in Colchester of Essex in the UK. [/span6] [span6]


Pure black is another option we offer for our casement windows. The pure black colour enhances the size and quality of our casement windows. They also enhance the visual impact of your property by defining the new and modern windows you have had installed. Pure black is also very easy to maintain. [/span6] [/row]

[row] [span6]


Magnificent grey is fastly growing in popularity and is it is becoming the most popular colour option for our casement windows. Magnificent grey is not only easy to maintain, but it also blends into the features and colour scheme of your property very well. Lots of people love our magnificent grey option as it is the newest colour option and is less defining when compared with the white and black options. [/span6] [span6]

Warranty25 Year Bifold Door Warranty purple - Casement Windows

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. [/span6] [/row]

[/tab2] [tab3]

Glass Options

bifolds 22 - Casement Windows

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.

bifolds 13 - Casement Windows

Energy Efficiency

All casement windows manufactured, built and assembled by Bi-folds Bi-design are fully energy efficient, resulting in the highest attainable energy efficiency scores being met for all casement windows we manufacture and install. Subsequently, if you want care for your home and economically friendly, low costing warmth all year round, why look anywhere else, other than Bifolds Bidesign. “Because We Can”. [/tab3] [tab4]

HardwareFast Bi-Fold Door Delivery

At Bifolds Bidesign, we only use the highest quality products that will last and test time. After all, this is why so many customers recommend Bi-folds Bi-design to all of their friends and family. As the company motto suggests – ‘Because We Can’. We achieve the impossible when it comes to aluminium based products.

We take full pride in our work and have the leading industry manufacturing specialists in house. If you are by any means concerned or wish to see the hardware used for your casement windows, then please do come in and visit us at the impressive Bi-Folds Bi-Design showroom in Colchester of Essex as we would love to show you the height of our quality products.

[/tab4] [tab5]


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 - Casement Windows ‘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 - Casement Windows

The Winkhaus group is in-excess of 160 years in established business and trading. Therefore, they are incredible experts in security as we only work with the very best in security manufacturing. “Because We Can”. The Winkhaus team are based in Kettering and this UK based association is of great importance to us as we believe in high quality manufacturing processes which are proven to be consistent here in the UK with the best regulations in place.          

Yale Security Locks

bifolds 3 - Casement Windows

We all know who Yale are and as you should know, Yale is one of the global leaders when it comes to door lock manufacturing and this is why we partner with Yale by installing their products throughout our range. We also apply this leading solution to all fixed window solutions as we understand the importance of high quality security solutions and this is why we invest into only the best products for you, our customer.




KBF e1493803572490 768x673 - Casement Windows

At Bi-Folds Bi-Design we handle all of the technicalities for you, all we require is your assistance with some simple measurements, unless you would rather we conducted an on-site survey and installed the bi folds for you, which is highly recommended. If you are a builder, developer, contractor, architect, structural engineer or one of our many resellers, then feel free to contact us to discuss your specific requirements both in terms of look and feel as well as all other technical specfications your require or advanced requirements needed. If so, please call us on 01206 212 040.






[/tab6] [tab7]


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 [email protected]



Casement Windows


Product Informationkws75-1

Top and side hung Applications.
Polyamide thermally broken aluminium frames, for improved
thermal efficiency.
28mm glass, as standard.
Upto 55mm glazing possible.
Joined using mechanical corners.
75mm polyamide sub frame section, for easy to install modular windows.
Easy clean and egress options available.
Slimline internal glazing option.
Cills, add ons, curtain wall insert and coupler sections available.

Key Features & Innovationscasement

  • 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.



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.



Click To Enlarge


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.

Quick Enquiry

[contact-form-7 id=”5″ title=”Contact form 1″]