Rationel AURA & FORMA

We’re proud to offer two timber product ranges: Rationel AURA (best suited for modern builds) and Rationel FORMA (ideal for traditional building styles). They consist of solid wood from the very innermost structure through to the external, resulting in excellent thermal and acoustic performance, combined with easy maintenance.

Each range is available in either double or triple glazing, and has been designed to exhibit the very best in energy efficiency.

Your windows don’t have to be white, either. With more than 200 colours to choose from, you can truly make them your own.

Bespoke timber windows.
Scandinavian craftsmanship.

Our passion for Scandinavian design runs deep – in fact, it’s what fuels everything we do, and has done for the last 60 years. This has never been more apparent than when you look at the details.

Each and every one of our timber windows is made bespoke. That means you’ll never find two products the same, and everything is crafted meticulously to make it the best it can be. We’re all about beauty and performance – so we’ll work closely with you to create something worthy of your home.

Find out more about what makes us different.

Windows that are built to last

We care greatly about the planet and our impact upon it. That’s why all of our timber windows are made exclusively from sustainably-sourced wood, taken from FSC®-certified forestry. They’re designed in such a way that with the right maintenance and care, they will last for generations to come.

Learn more about our sustainability promises.



Useful guides for side hung windows

Check out our helpful guides for information on everything from distributors to installation advice.

Downloadable links


Good aftercare is essential if you want your windows to last for decades to come – our aftercare information has got you covered.

Downloadable links