Double glazing or triple glazing: which suits your home?

Double glazing has two panes of glass with an insulated gap between them. Triple glazing adds a third pane and a second gap, and usually a slightly deeper, better-insulated frame to carry it. The result is a unit that loses less heat and can take more of the edge off outside noise.

The honest picture is that modern double glazing is already very good. Triple glazing builds on that rather than fixing a problem, so it is worth being clear about what you want before spending more.

For many renovations and replacements, well-specified double glazing in a quality frame does the job: warmer rooms, fewer draughts and a clean, modern finish. If the budget is tight or you are doing the whole house at once, putting good double glazing everywhere is often a sensible call.

Triple glazing tends to make most sense on new builds and deep retrofits, where the rest of the house is well insulated and airtight, and you want the glazing to keep pace. It also helps on large areas of glass, on north-facing rooms, and where you feel cold near the window in winter.

If you live on a busier road or near a flight path, the extra pane can help with noise too, though frame quality and good fitting matter just as much as the number of panes.

A warmer inner pane is less prone to surface condensation on cold mornings, which is something people notice day to day. Comfort is the part that is hard to put a number on: rooms simply feel more even, with less of a cold zone by the glass.

We look at each room rather than treating the whole house the same. Often that means double glazing through most of the home and triple glazing where it genuinely pays off. We will give you honest advice on a free quote rather than pushing the dearest option.