Double-glazed windows came on the market in 1952 ... You’ll need one if you change the size of the window opening. If you ...

The surface temperature of modern, energy-efficient double glazed windows is around 2°C lower ... frames and stronger hardware, or smaller opening sashes. This can make triple glazing more ...

Casement windows are hinged on one side, and a crank lets you open them outward. When fully open, casements allow good ventilation and easy cleaning. They’re usually more airtight than double ...

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 ...