Bespoke windows in timber with aluminium cladding

Timber windows are our passion. We have manufactured timber windows and doors since 1954 and will continue to do so for many years to come. In addition to their natural look, windows and doors made of timber have a long service life and are sustainable and easy to clean and maintain. The only disadvantage of windows and doors made entirely of timber is that they have to be painted after a number of years. Sun rays and wind and weather expose the paint to wear, especially on south facades, and windows and doors should therefore be painted approx. every 5 years.

To avoid maintaining windows and doors, Rationel Windows has developed several product ranges in bespoke aluminium and timber  which minimise the need for maintenance. The constructions consist of an all-timber sash and frame with external alu cladding offering protection against the weather. This means that you do not have to paint the exterior of your windows or doors during the life of the products.   


Aluclad Chop  

Advantages of alu clad timber windows

Our bespoke composite windows consisting of alu-clad timber have a list of advantages, the most important are:

  • Low maintenance
  • Natural look inside
  • Long lifetime
  • Protection against the weather 


Rationel Windows offer two product ranges in bespoke alu clad timber windows and doors: Rationel FORMAPLUS® and Rationel AURAPLUS®. Each composite product range has been designed to fit a specific building style.

Choose your architectural style


building style



building style


It is important that the style of your new windows and doors matches your home. Whether you are changing the original windows or replacements installed at a later date, you should always consider the internal as well as external appearance, as you will spend more time looking out of your new windows than looking in! Also, give thought to the practicalities of whether you want your sashes to be inward or outward opening, left or right hand opening, or for access and egress.

Rationel offers a wide range of composite window options. So consider the requirements of your house carefully, and we will find the perfect solution for you and your home.

We have composite windows and doors designed for almost any building or architectural style.

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