Rationel windows and doors

Good, solid quality has characterised Rationel’s windows and doors since the first products were shipped from the factory in Denmark in 1954. On that basis, Rationel has created a sound foundation, and is today an international company with sales activities in Denmark, Great Britain and Ireland.

Rationel manufactures energy saving timber and timber/composite windows and doors for all buiilding styles and traditions. In this section you can read about the wide range of products available.

Rationel offers a complete product programme where you are sure to find an opening function to suit your needs. Here, you can read about bhe various opening features and the needs, each of them fulfills.


Like many others, the window industry also has certifications, labels and warranties intended to protect consumers and the environement.


When choosing windows and doors from Rationel, it is possible to enhance the appearance and character of your house with a wide range of colours. Our standard colours cover the majority of architectural building styles and tranditions in the UK.


The primary funtions of panes are to keep out rain, to retain heat and to ensure a good view and contribution of light. But they offer many other features, which may be worth considering. Rationel panes are able to shield against the sun, reduce noise, inhibit burglary and save energy.

Secured By Design

Security performance will be a significant factor when it comes to select your windows and doors. Rationels’s experience with Housing Associations, community developments and commercial projects, means that the security and safety of our windows and doors are second to none.

Shaped units

You do not have to choose square solutions when rebuilding, extending or building a new home. Rationel produce windows and doors in the shape and design that suit your needs.


Rationel’s guarantee covers defects in manufacturing and materials in windows and doors delivered and used in the United Kingdom.

Declaration of Performance

Rationel’s products are tested in accordance with the Declaration of Performance scheme from July 2013. This is your guarantee of a highly reliable product.

The Wood Window Alliance

Rationel is a member of The Wood Window Alliance, which was formed in 2007 by a group of leading joinery manufacturers, installers and component suppliers.


Rationel Products