CS 77 Windows & Doors

CS 77 is a thermally-broken, multi-chambered system for windows and doors that offers excellent levels of security, weather resistance and thermal insulation.

The CS 77 system offers a comprehensive range of inward- and outward opening window and door designs that are available in a range of three different styles, making it ideal for both traditional and contemporary building designs.

Combined with a huge choice of colours and finishes, and the ability to specify a different colour inside and out, the CS 77 is a truly versatile system that can be specified to complement almost any home.

The fibreglass-reinforced polyamide strips and weather gaskets are designed with ribs and hollow chambers to achieve superior thermal insulation levels. A variant of the CS 77 has been awarded the coveted Swiss Minergie accreditation

Style Options

The CS 77 window and door system is available in three different style options.
Whether you prefer the more traditional Renaissance style or the very clean and
contemporary lines of the hidden vent style, the CS 77 has the aesthetics to complement almost any home.


The CS 77 not only looks stylish but is also a great all-round performer in terms of thermal insulation, weather resistance and security:
• Whole window U-values as low as 0.94 W/m2 K
• Up to 600 Pa air-tightness
• Up to 900 Pa water-tightness
• Up to 2000 Pa wind load resistance
• WK2 and even WK3 security with UK Secured By Design security, PAS 24:2012 or BS7950 depending on window type