Since 1954, Rationel has been perfecting the art of manufacturing energy-saving windows and doors of the highest quality, with a strong focus on both security and comfort. Beautifully designed windows can encourage mindful living and shared experiences, and create a literal opening to the outside world.
Designed in Scandinavia, for British homes that desire the balance between daylight and comfort. Rationel windows use sustainably sourced timber and exceptional craftsmanship – they’re built to last for decades and to be enjoyed for generations.
Security | Meets ‘Secured By Design’ standards |
Sustainability | Majority sourced from FSC-certified forests |
U-Value | 0.79 W/m2k (triple glazing) |
Sound reduction | 42 DB Rw (triple glazing) |
Colours | Over 400 RAL colours available |
Compliance | Meets Passivhaus standards |