Slenderpane double-glazed units are very unusual. Manufactured to order for trade customers, handmade in Haddenham, Buckinghamshire and incorporating the latest technology including black, white or grey, warm edge’ super spacers.

As a result when they are glazed into windows or doors, they visually are virtually impossible to distinguish from single-glazed units, but produce much lower heat loss values that comply with current building regulations.

When refurbishing sash or casement windows the aim is usually to retain the elegant appearance of single-glazing with while enhancing thermal and sound insulation.