Cortizo Windows & Doors
Premium Slimline Systems for Modern & Heritage Homes in East Anglia.
Kingswood Aluminium presents the Cortizo Window and Door collection—a suite of high-end aluminium systems designed to provide slim sightlines without compromising on security or thermal performance. Whether you are looking for contemporary “Hidden Sash” windows for a minimalist new-build or classic French Doors for a Norfolk renovation, our systems are engineered to the highest European standards.
Explore our market-leading casement, tilt-and-turn, and French door systems, tailored for the unique climate of the East of England.
COR 70 Industrial
The Steel-Look Aesthetic
Perfect for heritage projects or industrial-style interiors. This system mimics the slim profiles of traditional steel windows while providing modern thermal efficiency and PAS24 security.
Specifications:
Profile Depth: 70mm
U-Value: From 0.9 (W/m²K)
Glazing: Up to 55mm
COR 80 Hidden Sash
The Minimalist Choice
The sash is completely hidden behind the frame from the outside, creating a look that is indistinguishable from fixed glazing. It offers the cleanest possible architectural lines.
Specifications:
Max Weight/Sash: 160kg
Acoustic Insulation: 46 dB
U-Value: From 0.8 (W/m²K)
Millennium French Doors
Grand Entrances
Our French Door systems combine elegance with immense strength. Available in open-in or open-out configurations with low-threshold options for seamless transitions to gardens.
Specifications:
Hardware: Multi-point locking
Max Height: 2700mm
Config: Single or Double
Choosing the right finish is essential for architectural harmony. Request a physical colour swatch or book a consultation to see how our textures react to natural light.
Window Performance Matrix
Feature
Frame Depth
Max Glazing
Opening Types
Thermal Efficiency
Invisible Sash
Our “Hidden Sash” window technology represents the pinnacle of modern architectural design. By concealing the opening part of the window behind the outer frame, we ensure that every window in your home looks identical from the exterior, regardless of whether it opens or is a fixed pane.
Combined with our minimalist handles and ultra-slim aluminium profiles, this system maximizes your glass area, providing up to 15% more natural light than traditional uPVC or timber windows.
Recent Projects
From sleek anthracite grey windows in Norwich to traditional French doors in Southwold, see how Cortizo systems transform properties.
Thermal & Acoustics
Cortizo windows aren’t just about looks. They are designed for the extreme Norfolk coastal winds and noise insulation. Our COR 80 series features triple EPDM gaskets and advanced thermal breaks to ensure your home remains a quiet, warm sanctuary.
With acoustic attenuation of up to 46 decibels, our windows are the preferred choice for properties near busy roads or under flight paths, providing a significant reduction in ambient noise compared to standard double glazing.
Personalise Every Opening
Every window and casement door is custom-fabricated to your specific requirements:
Opening Styles: Choose from Tilt & Turn, Top-Hung, Side-Hung, or Fixed.
Dual-Colour: Match your exterior cladding while keeping the interior frames neutral.
Hardware Finishes: Architectural handles available in silver, black, white, or any RAL colour.
Astragal Bars: Add traditional glazing bars for a Georgian or “Crittall-style” look on our Industrial range.
Marine-Grade Coating: Available as standard for coastal properties in Suffolk.
Our SeamlessProcess
01. Expert Advice
We help you navigate opening types and thermal requirements.
02. Precision Survey
We measure to the millimetre to ensure perfect performance.
03. Direct Fabrication
Your windows are built using genuine Cortizo profiles and gaskets.
04. Specialist Fit
Our installers are experts in high-performance aluminium glazing.
Common Enquiries
A tilt and turn window opens two ways: it can tilt inwards from the top for secure ventilation, or swing open fully like a door for easy cleaning from the inside.
Yes. Our Cortizo window and door systems are fully tested to meet high security standards, featuring multi-point locking and robust aluminium profiles as standard.
Yes. Because we use the same RAL powder-coating processes across all Cortizo ranges, we can ensure a perfect colour match between your windows, sliding doors, and bi-folds.