Keystone Supplies, Unit 17 Storforth Lane Trading Estate, Hasland, Chesterfield, Derbyshire, United Kingdom S41 0QQ
01246 201523
Rationel Windows
Rationel's Scandinavian windows bring together daylight, beauty and warmth to fully amplify your home. Offering both Timber and Aluminium clad windows, Rationel is highly energy-efficient as standard. All of Rationel's windows are made to order so all aspects are carefully considered, from colour and glazing to opening and closing functions, to create something that’s perfectly suited to you.
Rationel's windows and doors collection merged with Velfac in 2026. This page is purely for ease of access to individuals still looking for Rationel Forma, FormaPlus, Aura, and AuraPlus ranges.
Traditional and Timeless
Rationel Forma & FormaPlus (Classic)
Ideal for traditional cottages, country estates, and period property refurbishments, these windows are a timeless statement for your home. Featuring characteristic bevelled edges and traditional glazing bar options, the Rationel Forma and FormaPlus family offers the most detailed customisable windows in both pure timber for true natural beauty and aluminium clad timber, for a hard wearing, low maintenance solution.
Contemporary and Modern Designs
Rationel Aura & AuraPlus (Ribo)
The contemporary Rationel Aura & AuraPlus product lines have a high-performance DNA stemming from their Scandinavian design. This range features slim, flush-fitting frames designed to maximize natural solar heat gain and daylight. Engineered with advanced thermal breaks, these modern windows are available in double or triple-glazed configurations to deliver exceptional energy efficiency and security for any modern or contemporary architectural project.
Stay Stylish With Matching Doors
Looking For Rationel Doors?
See Rationel's paired range of doors to perfectly complement your windows.
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Keystone Supplies Unit 17 Storforth Lane Trading Estate Hasland Chesterfield Derbyshire United Kingdom S41 0QQ
