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Rationel is a Danish company, manufacturing and selling timber framed windows and doors around Europe and other parts of the world. Every year they dispatch 350,000 frames. Their UK head office is based in Oxon, Oxfordshire.


It all began in Sønder, Denmark with a hard-working carpenter Richard R. Nielsen.

In 1954, he had his first order for 31 barn windows, which enabled him to invest in some modern machinery. More than 60 years later, Rationel employs 1,050 people in Denmark, Poland, England, Scotland and Ireland.


Rationel manufactures timber and aluminium clad timber windows and doors, all in characteristic Scandinavian flush frame style.

Currently Rationel runs 2 design lines to match a character of the building:

Both lines are available with triple or double glazing units. “+” next to the line name indicates that the frame comes with external aluminium cladding.

Timber used for production comes from certified sustainably managed forests.

More information

For all up to date technical information please contact our office at 01914478289 or follow link below which will redirect you to manufacturer's website.



The following products are available within Rationel range: