High-Performance Aluminium Windows for Modern Living

Why Choose Our Aluminium Windows?

Our aluminium window systems, including the industry-leading Alitherm 400 and Alitherm Heritage ranges, are engineered for style, strength, and energy efficiency. Ideal for everything from modern new builds to heritage renovations, our windows offer exceptional design flexibility and outstanding security — all while meeting the latest building regulations.

The Alitherm 400 system offers tilt & turn, flush casement, top/side-hung and fixed options, with PAS 24:2022 certification for enhanced protection. For more traditional projects or conservation areas, the Alitherm Heritage line provides a classic steel-look aesthetic with modern thermal and acoustic performance.

All aluminium windows from GSSW Ltd are powder coated in your choice of Smart Colour Guide finishes, including dual-colour and textured options. Our solutions are fully compliant with Part L of the Building Regulations and designed for easy fabrication and quick installation — making them perfect for both residential and light commercial applications.

Key Features And Benefits

• Slim, Elegant Frames – Maximise natural light with minimal sightlines
• Thermal Efficiency – Polyamide thermal break technology improves U-values
• Versatile Design Options – Standard, slimline, flush, heritage & tilt-turn styles available
• Durable & Low Maintenance – Aluminium resists rust, warping and fading
• Enhanced Security – Certified to PAS 24:2022 standards
• Custom Colours – Huge selection of durable powder-coated finishes
• Fast & Efficient Installation – Designed for smooth fitting with Quick-Glaze Beads
• Suitable for Any Project – From modern homes to listed buildings and public sector properties