Composite Windows and doors In Swansea. Covering South Wales, West Wales, Western England.
Rationel
Timber Aluminium Windows and Doors
Rationel Windows & Doors
Aspect Aluminium are excited to deliver some of the most exceptional timber frame windows with aluminium cladding. Rationel has over 60 years of product development, One of europes leading window and door brands with a reputation for quality and innovation, and with a solid distributor network. Founded in Denmark in 1954, Rationel is now part of the DOVISTA Group of leading window and door companies, and every year makes and delivers over 350,000 windows worldwide. Rationel windows and doors – Timber windows with aluminium cladding.
Rationel windows and doors are premium timber-aluminium composite glazing systems that combine the warmth and insulation of natural timber with the durability and low-maintenance protection of aluminium cladding. Aspect Aluminium supplies and installs bespoke Rationel windows and doors across South Wales and West Wales for residential and commercial projects.
Rationel windows and doors offer the perfect balance between traditional craftsmanship and modern performance. Designed in Denmark and engineered for the UK climate, Rationel systems deliver exceptional energy efficiency, elegant proportions, and long-term durability. Ideal for new builds, renovations, and architectural projects, they provide comfort, style, and reliability in equal measure.
Why Choose Rationel Windows & Doors
Rationel products are built around a solid timber core, finished externally with aluminium cladding to protect against weathering and reduce ongoing maintenance. This construction ensures excellent thermal performance, acoustic insulation, and long-lasting structural integrity. With advanced glazing options, precision engineering, and a wide range of finishes, Rationel windows and doors can be tailored to suit both contemporary and traditional properties.
Rationel - Window Styles
Rationel offers a versatile range of window and door configurations to suit different architectural requirements:
These including:
- Fixed Light Windows
Non-opening units designed to maximise natural light and uninterrupted views.
- Tilt & Turn Windows
Dual-function windows allowing secure ventilation or full opening for easy cleaning.
- Side Hung Windows
Classic outward-opening windows suited to traditional and modern homes.
- Top Guided Windows
Smooth-operating vertical sliding windows ideal for controlled ventilation.
- Fully Reversible Windows
Practical designs that rotate for safe cleaning on upper floors
- Rationel Doors
Including patio doors, balcony doors, and entrance doors, offering strong security, thermal efficiency, and elegant design.
What are Rationel windows made from?
Rationel windows and doors feature a solid timber core with external aluminium cladding, combining natural insulation with long-lasting weather protection.
Are Rationel windows energy efficient?
Yes. Rationel systems offer excellent thermal performance, with triple-glazed options achieving very low U-values for improved energy efficiency.
Are Rationel windows suitable for coastal areas?
Yes. The aluminium cladding is powder-coated to marine-grade standards, making it suitable for coastal and exposed environments.
Aspect Aluminium supply and install Alu Clad Timber Windows in a wide area including:
Swansea, Cardiff, Bridgend, Newport and surrounding areas - South Wales
Pembrokeshire, Newport, Carmarthen, St Davids - West Wales
Bristol & Local Surrounding Area - West England
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