Since 1954, Rationel have offered an excellent, solid, quality workmanship that has become synonymous with the brand.  Based on their sound foundation, Rationel are today an international company with offices in Denmark, Ireland and the UK and you may well have a neighbour with a Rationel window.

As manufacturers of premium quality, energy saving windows, comfort and security are of premium quality.  With a continued programme of development and research, their commitment to perfecting their products ensures that they always meet current statutory requirements, alongside market requirements for function and design, so you can be sure you are choosing a market leading product.

To find out more about the specific benefits that Rationel have to offer as well as the timber and alu-clad range that we offer, please navigate through the menu above.



New Hampton Home, Wrexham

New build development of a large family home featuring a range of aluminium clad timber Rationel windows in white working in perfect harmony with this New Hampton's inspired home.

  • Large Roof Lantern
  • Energy Efficiency
  • Traditional styling

Click the image to view the full case study.

Eco build, Criccieth

Development of a brand new Eco home in Criccieth complete with a full glazing installation from John Knight Glass. Bifold doors from Centor and windows from Rationel. All products where fitted with 44mm triple glazing which when combined with the timber Rationel frames gives an overall U value of around 0.6.

  • Insulated Concrete Forms (ICF)
  • Triple Glazing.
  • Eco building.

Click the image to view the full case study.

Alu-Clad Windows Cheshire

Our clients purchased this spacious family home within an extremely popular village in Cheshire. The home whilst structurally sound required a series of updates to bring it into the 21st century.

Many of the rooms have been updated with new interior furnishings with the main kitchen/living area having some structural alterations and a complete overhaul to create the perfect family living space. As part of the new kitchen/living area some of the windows and door opening where altered to bring in extra light into the space and improve the indoor/outdoor flow.

  • Sliding Door.
  • Open plan living.
  • Alu-clad timber.

Click the image to view the full case study.

Rationel Windows Cheshire

Located in a sought after village in Cheshire, the owners fell in love with this stunning property that required a major overhaul. With a plan to renovate the original buildings and extend the main building to create the ultimate dream family home.

  • Centor bifold doors
  • Period property renovation
  • Alu-clad timber.

Click the image to view the full case study.

Replacement windows and doors, Anglesey

Situated just minutes from the beach with a sea view, Mr R purchased this property with the view to redevelop both the interior and exterior to create the perfect holiday cottage for both long and short term holiday lets.

Upon completion of the new plans for the re-development of the cottage Mr R was looking to achieve a contemporary look with a mixture of grey colours. Originally the property was fitted with UPVC rosewood windows which did not fit with the overall look of the property re-development, the original windows were also looking tired and lacking in energy efficiency.

Click the image to view the full case study.

Property Renovation, Criccieth, Wales

Planning a complete renovation of this detached bungalow in Criccieth, Wales with a view to modernise both the exterior and interior of the property, creating a large family living space with access to the garden via bi-folding doors. The owner wanted to install brand new grey windows and doors to contrast with the white painted render on the property, having looked around at the grey UPVC units on offer they were not satisfied with the look of the grey foils available on UPVC windows.

After looking around on the internet and reading about alu-clad windows on our website they decided a visit to our Heswall showroom was a must. Impressed with the powder coated finish of the aluminium capping externally and the internal finish of the wooden core they decided to go with Rationel alu-clad timber windows throughout the property, with a front door from Rationel and a set of aluminium bi-fold doors from Centor to make the most of the outdoor living space.

Click the image to view the full case study.

Conservatory Replacement, Wirral

After purchasing their new home, our clients were certain they would need to do something with the old conservatory at the rear of the property. In a poor state with lots of rot, draughty windows and a polycarbonate roof that had seen better days, the original timber conservatory was a real cold spot in the house and with the leaky roof and windows it was a completely unusable space. After looking into multiple options, it was clear that the best solution was to keep the original conservatory base and replace the roof, windows and doors with brand new units.

Click the image to view the full case study.

Rear Extension, West Kirby

This installation of expansive Rationel windows and doors to complete a rear extension ensured that our client's new space was both light filled and airy, helping to connect their internal living space with their stunning feature garden.

The traditional extension was given a contemporary edge with the installation of black aluminium clad timber windows and doors, while maintaining a cosy and warm interior thanks to the tactile timber inside.  Another reason our client opted for this specification was to minimise ongoing maintenance for the future, a benefit of an aluminium clad exterior, so they can spend more time in their fabulous garden and less time on maintenance.

Click the image to view the full case study.


Our Heswall showroom has one of the largest window and door displays in the UK, if you are interested in Rationel windows and doors a visit to our showroom is well recommended. Below are some pictures of the Rationel products on display in our showroom.

Rationel french doors on display in our Heswall showroom.
Rationel french doors on display in our Heswall showroom.
Rationel glass door on display in our Heswall showroom.
Rationel glass door on display in our Heswall showroom.
Rationel Alu clad french door on display in our Heswall showroom.
Rationel Alu clad french door on display in our Heswall showroom.
Rationel windows and entrace door on display in our Heswall showroom.
Rationel windows and entrace door on display in our Heswall showroom.


Rationel windows are constructed to a very high standard offering a long lasting product that will deliver great performance, security and weather tightness. To find out more information about what makes these windows so special, please navigate through the sections below.



Security is one of the key factors to be considered when choosing windows and doors as they are the most commonly targeted entries of a break in. Rationel is ahead of the game in this area and have invested heavily in the development of their products' security. Rationel windows have achieved Secured By Design certification for your peace of mind.



Rationel windows frames are constructed from timber which is considered to be the most sustainable material to manufacture window frames from. Rationel have been certified with the FSC global labelling scheme for sustainable wood and paper.


Energy Efficiency

Improving the energy efficiency of your window can greatly reduce your heating bills and improve the comfort of your home. Rationel windows are a great choice when looking for energy efficient windows as their alu-clad timber construction offers superb air tightness and when combined with the latest triple glazing glass can achieve very high U value, compatible even with strict Passive House standards.


Glazing Options

Rationel windows have a large range of optional glazing choices all designed to suit different requirements. Rationel have developed a range of glass technology including ENERGY, SECURE, OBSCURE, SAFETY, FACADE, SOUND and SOLAR.




Many products from the Rationel window range have been put through a range of durability test to ensure they can withstand the harshest weather. Rationel windows are tested against water tightness, wear and tear and weather tightness.

Shaped Windows

Rationel windows are extremely customisable perfect for those looking to achieve something bespoke. Rationel windows can be supplied in custom shapes on request.