Rationel Windows

Rationel Windows

Rationel Windows

Rationel Windows – Scandinavian Craftsmanship Meets Modern Performance

Beauty, Comfort and Efficiency in Every Frame

Rationel Windows are more than just a design choice – they are an investment in comfort, energy efficiency, and timeless Scandinavian style. Crafted from FSC® certified timber and clad externally in aluminium, these windows combine natural warmth with modern durability. Designed to withstand the elements while maintaining their beauty for decades, Rationel Windows bring a sleek, contemporary profile to any home.

Whether you’re working on a cutting-edge architectural build or upgrading a classic property, these windows deliver exceptional performance without compromising on style.

Superior Insulation and Energy Efficiency

Built with 52mm triple-glazed units, Rationel Windows offer some of the best insulation on the market – achieving U-values as low as 0.79 W/(m²K). This outstanding thermal performance ensures your home stays warm in the winter and cool in the summer, reducing heat loss and keeping energy bills in check.

Perfectly suited for low-energy builds and Passivhaus-certified projects, Rationel Windows contribute to a sustainable future while creating a more comfortable indoor environment. Every frame is designed with advanced weather sealing and airtight construction to deliver consistent energy savings year after year.

Rationel Windows
Rationel Windows

Durability That Stands the Test of Time

With a robust construction depth of 123mm and a minimum life expectancy of 40 years, Rationel Windows are built to last. They are Secured by Design accredited, meaning they meet the UK police-backed security initiative for burglary resistance.

Independently tested for strength, durability, and weather performance, these windows protect your home from the elements and unwanted noise – reducing external sound by up to 42dB. The result is a peaceful, insulated interior where you can truly relax.

Light, Space, and Bespoke Design

Rationel’s outward-opening system allows for flexible design solutions while maximising ventilation and natural light. Whether you prefer minimalist frames for a modern look or traditional styling for a heritage property, Rationel Windows can be tailored to suit your project perfectly.

With multiple colour options, finishes, and hardware choices, every detail can be customised to match your design vision. And with a 10-year warranty included, you can be confident in their quality and performance for years to come.

 

Rationel Windows
Rationel AURAPLUS

Why Choose Rationel Windows?

  • Scandinavian Craftsmanship – Sleek profiles and timeless design.
  • Triple Glazing Excellence – Outstanding insulation and energy savings.
  • Long-Term Durability – 40-year lifespan with minimal maintenance.
  • Security Assured – Secured by Design accredited for peace of mind.
  • Customisable Options – Tailored sizes, colours, and finishes.

When you choose Rationel Windows, you’re not just installing a product – you’re investing in quality, comfort, and sustainability that lasts for decades.

Frequently Asked Questions

Rationel Windows combine Scandinavian craftsmanship with triple glazing, FSC® certified timber, and aluminium cladding for exceptional performance, durability, and style.

Yes. Their U-values can be as low as 0.79 W/(m²K), making them ideal for Passivhaus and other low-energy building standards.

With proper care, they have a minimum life expectancy of 40 years, thanks to their robust construction and quality materials.

Absolutely. They are Secured by Design accredited, meaning they meet high UK security standards.

Yes. You can choose from various styles, colours, glazing options, and hardware finishes to suit your design preferences.

Our Trusted Partners

Internorm Partner
Smart Windows
Residence Collection
velfac logo
solarlux
sunflex
zyle fenster
rationel
Internorm Partner
Smart Windows
Residence Collection
velfac logo
solarlux
sunflex
zyle fenster
rationel

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