Aluminium Flush Sash Windows
A refined flush finish with premium aluminium strength
Aluminium flush sash windows are a stylish choice for homeowners who want a refined, modern window with a flat, elegant appearance. Sumner Windows supplies and installs aluminium flush sash windows across Kent and the surrounding region.
The flush sash design allows the opening sash to sit neatly within the outer frame, creating a smooth, balanced appearance. Combined with aluminium's natural strength, this gives a slim, high-end look that works beautifully on modern homes, extensions and character buildings alike.
They maximise glass area and natural light, create a sharp architectural finish, and offer strong locking, durability and modern thermal efficiency.
Why choose Aluminium Flush Sash Windows
- Clean flush finish with premium strength
- Slim sightlines and more natural light
- Suitable for modern and traditional homes
- Secure, durable and energy efficient
- Wide powder-coated colour choice
Engineered for performance
- Sash sits flush within the outer frame
- Thermally broken aluminium frames
- PAS24 approval when specified correctly
- Single and dual-colour finishes
- Maximised glazed area
Configurator
Mix and match colours, hardware and glass to suit your home.
Available finishes
Choose your style
- Flush side-hung casement
- Flush top-hung casement
- Fixed flush light
Glass options
- Standard energy-efficient double glazing
- Solar-control glass
- Acoustic glazing
- Triple glazing on request
Furniture & hardware
- High-security multi-point locking
- Modern handle options
- Single or dual colour finishes
Engineered to protect
Security is built in as standard, with strong frames, modern multi-point locking and quality hardware. PAS24-rated and enhanced-security options are available where required, giving you peace of mind as well as improved comfort and kerb appeal.
Tailored to your home
We help you choose the right frame style, colour, glazing and hardware to suit your property and budget. Dual-colour options are available on many styles, allowing a different finish inside and out.
Property suitability
Ideal for homeowners wanting a cleaner alternative to standard casements — beautiful on modern homes, extensions, renovated properties and character buildings.
How we fit it
From your first enquiry to the final installation, Sumner Windows looks after the whole process. We start with a free site survey and accurate measurements, help you choose the right style, colour and glazing, then fit your new windows with our own experienced installers. Interiors are protected throughout and all waste is removed, leaving you with a clean, finished result.
Frequently asked
What is an aluminium flush sash window? +
Are they secure? +
Can I have different colours inside and out? +
More Aluminium Windows
Like the Aluminium Flush Sash Windows? Let's talk.
Free site visits across Kent and London — get in touch to discuss your project.