At AT-ECO, we specialise in installing Internorm systems across Kent and the South East, including homes targeting Passivhaus standards or simply aiming for low-energy, low-maintenance performance. This article explores how Internorm’s precision-engineered solutions outperform conventional options and how our clients have benefited from their investment.

Internorm vs. Standard Windows and Doors

Most UK homes still rely on double-glazed uPVC units, typically achieving Uw-values between 1.4 and 2.8 W/m²K. While suitable for basic compliance, these systems fall short in delivering the long-term energy savings, acoustic comfort, and modern performance features many homeowners now seek.

Internorm's Triple-Glazed Advantage: Internorm’s advanced window systems are engineered for high-performance, low-energy buildings and deliver:

• Uw-values as low as 0.62 W/m²K, significantly exceeding current and future UK Building Regulations, including the 2025 Part L targets.
• Sound insulation up to 48 dB, when paired with specialist acoustic laminated glass—ideal for homes near busy roads, schools, or flight paths.
• I-tec Locking systems: Internorm’s fully integrated locking system provides superior security and a flush, handle-free aesthetic—enhancing both performance and design.

Real-World Result: In a recent retrofit project in London, we replaced deteriorating timber casements with Internorm HF410 timber-aluminium windows. The upgrade delivered:

• Noticeable heat retention through triple glazing and insulated frames
• Improved acoustic performance with optional laminated glass
• A clean, contemporary exterior with no visible locking hardware
• Minimal maintenance requirements—ideal for modern living

Whether you're upgrading a period property or building new, Internorm offers the best of both worlds: cutting-edge technology and timeless style.

Internorm KF410: Passivhaus-Ready, Elegantly Engineered

The Internorm KF410 uPVC-Aluminium window system is a staple in low-energy builds and retrofits alike. Its combination of technical depth and visual simplicity makes it ideal for projects balancing strict thermal targets with clean architectural lines.

• Triple glazing with optional solar control
• Thermal bridge-free construction that actively prevents condensation and heat loss
• Uw-values up to 0.63 W/m²K, making it suitable for Passivhaus and Future Homes Standard
• Slimline profiles and flush finishes for contemporary styling

We regularly recommend KF410 units for extensions or modernisation projects where comfort and future-proofing are top priorities.

I-tec Locking: A New Benchmark for Window Security

Unlike traditional locking systems that rely on visible points or basic multi-point mechanisms, I-tec Locking integrates locking flaps directly within the sash. This provides:

• All-round compression of the sash into the frame
• No exposed weak points, offering higher resistance to forced entry
• A completely concealed system that enhances both design and usability

Clients in urban and suburban environments especially value this system for its blend of security and discretion. We’ve had multiple homeowners comment on how reassuringly solid these windows feel compared to their previous systems.

I-tec Decor: Bespoke Aesthetics, No Compromise on Performance

I-tec Decor introduces digital surface printing to the interior of Internorm windows—allowing you to match window profiles with flooring, furniture, or door colours.

• Choose from 11+ finishes, including woodgrain and contemporary tones
• Multi-layer application ensures resistance to UV, cleaning products, and scratches
• A perfect solution for designers and homeowners who value stylistic continuity across their interiors

For homeowners in London, AT-ECO offers the option to enhance interiors with Internorm's I-tec Decor, allowing you to perfectly match window frames with your existing oak flooring or other design elements. Create a seamless, elegant transition from room to room—combining style with energy efficiency.

Internorm Entrance Doors: Security Meets Architectural Presence

Internorm’s entrance door systems offer more than just an elegant entryway. Behind every panel is a combination of materials and features built for security and performance:

• Five-point motorised locking mechanisms
• PAS24 (PAS24/SBD) and RC1–RC3 burglary resistance certification
• Thermal insulation down to 0.55 W/m²K (up to )—among the best in the market
• Wide customisation: over 200 panel options, designer handles, sidelight glazing and more

We've installed these doors in period conversions and new builds alike—often replacing legacy timber doors where draughts and poor locking were an issue.

Lift & Slide Doors and Panoramic Glazing

The ability to blur the line between indoors and out has become a central design goal. Internorm’s lift & slide systems—particularly the HS330 and KS430—offer:

• Ultra-smooth sliding mechanics, even on large panes
• Glass-to-glass corner options for a true frameless feel
• Uw-values from (up to ) 0.64 W/m²K, maintaining thermal integrity
• Optional automation for enhanced accessibility

In homes with gardens or terraces, clients consistently cite these as one of the most transformative changes made to their living space.

Why Internorm?

Here’s why more UK homeowners, architects, and developers are specifying Internorm:

• Triple Glazing as Standard
• Advanced airtightness for energy savings and noise reduction
• Passivhaus-certified systems available across multiple product lines
• European engineering, UK installer expertise—backed by FENSA-certified installation

And at AT-ECO, we’ve built our entire approach around specifying and installing Internorm products the way they were designed to be used: with precision, care, and full compliance with UK building standards.

Ready to Explore the Internorm Range?

We invite you to visit our showroom in Brasted, just outside Westerham, to see Internorm systems up close. Whether you’re planning a new build, upgrading a period property, or simply want a warmer, quieter home, we’ll help you choose the right solution—and install it to the highest standard.