Double glazing windows for a warmer, quieter home

How double glazing keeps your home comfortable

Single glass lets heat straight through. Double glazing puts two panes in one sealed unit, held apart by a spacer bar, with air or an inert gas such as argon trapped in between. That layer acts as a barrier, so heat moves through the window far more slowly.

You notice it in a few ways. Rooms warm up faster and hold their heat after the heating goes off. The cold zone you feel when you sit near a window shrinks. In summer, the same barrier helps stop rooms overheating.

Our uPVC windows can reach window energy ratings as high as A. To see your home's overall EPC rating and where it loses heat, use our free energy check.

Condensation, draughts and noise

Condensation forms when warm, moist air meets cold glass. With single glazing, the inner pane is cold, so water runs down onto the sills and can lead to mould and rotting frames. Double glazing keeps the inside pane warmer, which reduces that build-up.

New frames also seal tightly, which stops the draughts that come through worn seals and gaps. Because sound has two panes and a sealed gap to cross, traffic, neighbours and street noise are noticeably softer.

Security and quality standards

Our double glazing windows are PAS 24 security rated, a standard that reflects the quality of our in-house manufacturing. Every window has a full Yale locking suite, so every lock and hinge on the window is Yale, down to the keeps and handles.

The suite includes heavy duty anti-hike shoot bolts, Vector excluders and Egress easy-clean hinges. Two panes of glass also make the window harder to break than single glazing.

Signs your double glazing has failed

Double glazing does not last forever. The seal that holds the two panes together can break down with age, and once it goes, moist air gets into the gap and the unit loses much of its insulating effect.

Look out for fog or droplets between the panes that won't wipe away, rooms that feel colder near the windows than they used to, and frames that are warped, hard to close or let in draughts. If your windows are more than a decade old and showing these signs, it is worth getting them checked.

Double glazing in every style

Better glazing does not mean giving up on the look you want. We fit double glazing in all our window styles, made to measure for your home.

• Casement: simple side-hung windows with tight seals and plenty of light.
• Tilt and turn: two ways to open, with a safe tilt position that lets air in.
• Vertical sliding sash: the look of a traditional sash with no rot or rust.
• Bay: more glass and more light, kept warm with double glazing.