Crafted for the Future. Installed by Experts.
At TDM Installations Ltd, we’re proud to offer the award-winning range of Rationel windows and doors – a perfect fusion of Scandinavian design, sustainable craftsmanship, and cutting-edge performance.
Whether you’re building a contemporary home or restoring a classic property, Rationel delivers more than just glazing – it transforms how you live. Designed to enhance natural light, elevate architectural aesthetics, and optimise thermal comfort, these windows and doors bring style and substance in equal measure.
Built to Last – Designed to Inspire
Every Rationel product is crafted using sustainably sourced timber and engineered with exceptional care to stand the test of time. With double or triple glazing options, you can enjoy outstanding energy performance and a cosy indoor climate all year round.
Winner of the Build It Live 2024 Award – Best Casement Window
A true testament to Rationel’s innovation and excellence.
Choose Your Style
AURA / AURAPLUS
- Clean lines, minimal frames, and a sharp modern aesthetic.
- Perfect for contemporary architecture or a Scandinavian-inspired finish.
- AURAPLUS features aluminium-clad timber frames for enhanced durability and design flexibility.
FORMA / FORMAPLUS
- Traditional charm meets high performance.
- Ideal for homes with classic British architecture or heritage character.
- FORMAPLUS adds aluminium cladding for minimal maintenance and long-term performance.
External Doors – A Statement of Style & Security
Your front door is more than an entry point – it’s your home’s first impression.
Rationel doors offer the perfect balance of form and function, crafted with high-quality materials and achieving Secure by Design accreditation for added peace of mind.
Whether you’re after sleek modern minimalism or timeless traditional detailing, we’ll help you choose the right style, colour, and finish to elevate your home’s exterior.
Why Choose TDM Installations Ltd?
✔ Nationally approved installers of Rationel products
✔ Deep technical expertise in glazing performance and building design
✔ End-to-end support – from design consultation to precise installation
✔ Warranty-backed work in direct partnership with the manufacturer
Ready to Transform Your Space?
Visit our showroom or speak with our expert team today to explore the full Rationel range. We’ll guide you through every option and help you make confident choices that complement your lifestyle, your home – and your future.
Get in Touch