Composite windows, also known as alu-clad windows, are one of the most modern, energy-efficient and sustainable window solutions available today. They combine the natural beauty and insulating power of timber on the inside with the durability and low-maintenance benefits of aluminium on the outside.
Unlike traditional “composite” entrance doors (typically a mix of timber and PVCu), these Scandinavian-engineered windows feature a high-performance timber core with an external layer of weatherproof aluminium cladding. The result is a window that looks stunning, offers superior insulation, and requires minimal maintenance. With a life expectancy of up to 60 years, composite windows are a smart, long-term investment for any home.
At Habify, we are proud to be Norfolk’s distributor for Velfac & Rationel products, Europe’s leading manufacturer of composite windows and doors. We supply and install these products across Norfolk, Suffolk and Cambridgeshire.
Composite windows are engineered to last. With a proven life expectancy of up to 60 years.
The warmth of timber internally, paired with low-maintenance high quality aluminium externally.
Composite windows are designed to exceed energy efficiency standards. With U-values as low as 0.7
Founded in Denmark in 1954, Velfac is Europe’s leading manufacturer of composite windows.
Due to the nature of the product, we supply and install triple glazing as standard within.
40 standard colour options, plus the option to have any RAL colour.
At Habify, we supply and install Rationel composite windows across Norfolk, Suffolk and Cambridgeshire, combining Scandinavian craftsmanship with local expertise. Built with a natural timber core and a durable aluminium exterior, composite windows offer the perfect balance of warmth, insulation and weather resistance, with a proven lifespan of up to 60 years.
They are highly energy-efficient, achieving U-values as low as 0.7 W/m²K, helping to reduce heat loss and cut energy bills, while their FSC®-certified timber and recyclable aluminium make them an eco-friendly choice for modern homes.
Available in three distinct ranges Aura for contemporary styling, Forma for timeless tradition, and Velfac for slim, minimalist frames.
Composite windows can be tailored to suit any property, from period homes in North Norfolk to new builds in Cambridge or Bury St Edmunds. With a wide choice of colours, interior finishes, glazing options and premium security features, these low-maintenance windows are designed to look beautiful and perform for decades.
Installed by Habify’s expert team who undergo regular training on these products, composite windows are a sustainable, secure and stylish investment in your home.
Below, we’ve answered some of the most common questions about composite windows. If you’d like more details or have any other queries about our services, please don’t hesitate to get in touch.
Yes, it’s one of their biggest advantages. The timber core acts as a thermal break, helping reduce heat transfer, while triple glazed units further improves insulation. Our Velfac & Rationel range exceed regulations and can be used in Passive builds.
VELFAC & Rationel provides a 12-year product warranty on windows and 5 years on entrance/sliding/hinged doors.
Definitely. VELFAC’s window systems are designed to exceed the demands of new build construction in the UK, combining high performance, design versatility, and compliance with modern building regulations.
Tailor-made / made-to-measure: Every VELFAC window and door is manufactured to custom dimensions, meaning they can suit any design or architectural plan in a new build.
Slim profiles, more daylight: The VELFAC 200 uses a 54 mm profile “floating frame” to maximise glazing area, letting in more natural light a desirable feature in modern homes. This also means windows & doors have the same sightlines.
High energy performance & regulation compliance: VELFAC windows are engineered for strong thermal efficiency, and their triple-glazed variants (like VELFAC 200 ENERGY) are suitable for demanding new build standards. They are also certified for use in domestic, commercial, and multi-plot housing projects.
Design flexibility: The system supports varied opening functions, multiple shapes, and combinations of fixed and operable sashes.
Low maintenance and durability: The aluminium exterior ensures resistance to weather, requiring minimal upkeep, ideal for new homes where longevity and low maintenance are expected.
Once we receive your enquiry, we’ll be in touch to understand your project in more detail. We typically arrange a complimentary site visit to assess your requirements, although remote consultations are also available where appropriate.
You can also contact us by:
Calling us on: 01603 905080
or email: info@habify.co.uk
