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Cookie policy uses cookies.

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The purpose of cookies is to help websites identify users in order to provide them with the best possible experience of the site. uses the following types of cookies:


Session cookies:

A session cookie identifies you as a user during the time that you spend on the site. This cookie is deleted when you close your browser.


Analytics Cookies: uses cookies from Google Analytics. Google Analytics is a tool for measuring website traffic, which Rationel uses in order to collect usage statistics about, which pages and features are accessed by users on As a user you can opt out of Google Analytics cookies here:


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When you accept the use of cookies (either by clicking accept or by continuing to use the site), a cookie is saved with this information. Thereby you will not be presented with the cookie policy the next time you visit the site. This cookie is saved for one year.


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Rationel doors and windows are manufactured at a modern factory with the most up-to-date machinery and systematic quality checks throughout the production process. This is the best guarantee for our overall high quality and superior products.

Rationel - a promise of quality

We have made a series of video´s illustrating how our products are tested. These tests highlight our commitment to the importance of security, durability and air tightness. Although not compulsary all our products are tested in this way to ensure we meet the highest standards


Danish Window Verification

Rationel is DVV-certified. This means that DVV (Danish Window Verification) visit factories regularly to ensure that its certified memegers observe the product and production standards specified in its technical provisions


DS/EN ISO 9001:2000

Rationels management system meets the criteria in ISO 9001.

Indoor climate labelling

Rationel Windows A/S has the Danish Indoor Climate label. This guarantees that Rationel products release no toxic gases when installed in buildings.


Rationel products are tested and approved according to the official CE-mark.
Click here for further information.


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  • Rationel Windows Ltd.
  • 7 Avonbury Business Park
  • Bicester, OX26 2UA
  • United Kingdom
  • Phone +44 1869 248 181
  • Legal disclaimer