Expect to pay 15-30 percent more than for double glazing. These windows are heavier and available in fewer styles. Finding triple glazed windows in timber and aluminium is difficult.

According to comparison website Checkatrade, simple, outward-opening double-glazed windows can cost from £360 to £680, depending on their size. A whole house of 12 windows might cost £5,000 to ...

Double glazed windows with thick multi-layered glass panes are pretty standard across modern homes in Britain, and condensation inside the glass is a common problem as well.

A uPVC double-glazed window including VAT, fitting, frames and everything else can cost under £600, by comparison. So going for a vacuum unit could easily add 50 per cent to the cost, and that ...