Sapa Building Systems has developed the Crown Window System to help specifiers meet the higher levels of the Code for Sustainable Homes

The thermally broken aluminium casement windows have slim frame sightlines - 35mm for fixed lights and 59mm for an opening light plus the outer frame.

The windows can achieve a window energy rating of A and a U-value of 1.6W/m2K with conventional double-glazed sealed units.

Sapa Building Systems