Aluminium
Aluminium Flush Casement Windows
Sleek, modern aluminium flush casement windows where the sash sits perfectly flush with the frame — delivering clean lines and superior performance. Ideal for contemporary builds and period renovations where planning restrictions demand a traditional flush appearance.
Features & Benefits
Flush Sash Design
Sash sits level with the frame for a sleek, flat finish
Slim Aluminium Profiles
Maximum glass area for more natural light
Any RAL Colour
Powder-coated in any colour from the full RAL Classic range
Friction Hinges
Easy cleaning access from inside your home
Multi-Point Locking
Secure espagnolette locking as standard
Conservation Friendly
Flat profiles closely match traditional timber windows
Our Installations
Technical Specifications
Frequently Asked Questions
What are aluminium flush casement windows?
Windows using the Cortizo Cor 70 Hidden Sash where the sash sits perfectly flat within the frame when closed, creating a sleek appearance suitable for contemporary and heritage properties.
What's the difference between flush and standard casement?
Standard casement windows protrude from the frame when closed. The Cortizo flush variant sits level with the frame for a smooth, flat finish while maintaining ventilation and security.
Are they suitable for conservation areas?
Yes — the Cortizo flush profiles closely match traditional timber windows. Many conservation officers accept aluminium flush casements as suitable replacements for heritage properties.
How energy efficient are they?
The Cortizo Cor 70 Hidden Sash flush system uses thermally broken profiles and argon-filled double or triple glazing achieving U-values from 1.2 W/m²K.
What guarantees do you offer?
Cortizo Cor 70 Hidden Sash and Schuco AWS 70 SC Slimline flush casement systems both carry a 10-year manufacturer warranty on profiles, finishes and hardware. The fitting is FENSA registered, confirming compliance with Building Regulations Part L for thermal performance, and is backed by a 10-year CPA insurance-backed guarantee that protects you against installation defects even if Vitrum Solutions ceases trading.
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Related Guides
In-depth advice from the Vitrum Solutions blog to help you choose with confidence.
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Flush casement windows sit flat with the frame for a clean, traditional look. This guide covers the difference from standard casements, cost, conservation area rules and whether they are worth the premium.
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Planning & HeritageBest Aluminium Windows for Conservation Areas in the UK
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Cost GuideAluminium Windows Cost UK: What You'll Actually Pay in 2026
How much do aluminium windows cost in the UK in 2026? Realistic prices for casement, flush casement, sliding and fixed aluminium windows fully installed.
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