Run to success

Rationel Windows

Every year, Rationel windows dispatch 350,000 Danish windows and doors internationally from factories in Poland. Producing both modern and classic styles for new build and refurbishment projects for over 60 years, Rationel have always been based on excellent craftsmanship.

As a Rationel Approved Distributor and Rationel-trained installers, we at Enlightened Windows are happy to assist you with your future Rationel project.

We offer a full supply and fit package as a single contract or, if you prefer, we can help you to find the perfect set of windows and doors, supply the units and allow you to organise the installation (supply-only).
Please feel free to browse through the Rationel Virtual Showroom.

Rationel Forma


Traditional style

Designed for a more traditional style of building, the Forma and FormaPlus window offers either an all-timber or composite wood/timber construction with slim, non-continuous bars. Featuring an ovolo moulded profile and angled glazing bead, Forma/FormaPlus is perfect for older, classic and country style houses.

Rationel Aura


Contemporary Style

Designed for a low-energy building style, the Aura and AuraPlus window offers either a solid timber or wood/aluminium composite construction and the ability to attain high levels of solar gain. Featuring a sleek and minimalist construction, AuraPlus is perfect for modern building with a contemporary design.

Rationel U-values

Triple Glazing0.780.790.780.80
Double Glazing1.

Values in Watts per Square Meter Kelvin (W/m2k)

Rationel Windows Photos

Rationel use only the highest quality raw materials and the very best workmanship. Most noteworthy, the timber used originates from North European FSC certified forests – meaning that they do not cut down more trees than the forest is able to reproduce.

Rationel Windows aim to create comfortable, cost-effective and energy-efficient homes. So we guarantee that you’ll receive one of the market’s highest quality efficient products.

A full range of Scandinavian windows are on offer, including side-hung, top-guided and tilt and turn windows. Entrance doors, terraced doors and full panelled doors are also configurable. Whilst Rationel do not supply bifold doors, we do offer the slimmest design available in the uk from the Lacuna bifold door range.

With its modern production facilities and superior products, all of which comply with building regulations, Rationel is in the forefront of energy-efficient window and door manufacturing.

All products can be Secure by Design.