Rationel Windows & Doors in Surrey, Hampshire & Berkshire

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Rationel Windows in Chobham, Ascot, and surrounding areas

Rationel specialises in bespoke, sustainable windows and doors for commercial and residential properties. As a leader in innovation, design, and quality, we're renowned in Europe for low-energy buildings and Passive House construction.

With over 60 years of experience, we're experts in energy-efficient double and triple glazed windows. Our global growth stems from our commitment to constant innovation and superior craftsmanship.

Choose Rationel for iconic Scandinavian design, meticulous attention to detail, and industry-leading windows and doors. Our state-of-the-art factory and skilled technicians ensure compliance with European and UK standards.

Experience Rationel: Superior windows and doors for every project.

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Timber or aluminium clad timber windows?

Rationel exclusively use timber, but for enhanced durability and reduced upkeep, we also provide aluminum-clad frames. Timber windows are an excellent option for both contemporary and classic residences. The incorporation of solid timber at the heart of our frames ensures exceptional thermal and acoustic efficiency. Alu clad windows retain the same solid timber core while introducing external aluminum cladding. This cladding significantly prolongs the lifespan of your windows and grants you windows that demand minimal upkeep, allowing you to effortlessly relish their benefits.

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Understand the Rationel Range

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Contemporary timber

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Contemporary timber/aluminium

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Traditional timbe

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Traditional timber/aluminium


Rationel excels in Scandinavian architectural glazing design, optimizing natural light and ensuring exceptional weather resistance, security, and comfort.

With headquarters in the UK, Ireland, and Denmark, Rationel has emerged as a reliable and esteemed company, recognized as a top manufacturer of high-quality aluminium clad and timber windows and doors.

Each window and door undergoes meticulous craftsmanship using traditional methods and is constructed with premium sustainable materials. This meticulous approach guarantees the highest specifications and exceptional longevity for our products.


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