Double, low-E or triple glazing?

Glazing makes up most of a window's area, so it has the biggest effect on how warm and quiet a room feels.

Double glazing

Two panes of glass with a sealed, insulating gap between them. It's the standard choice and a big step up from single glazing.

Low-E double glazing

Adds a microscopically thin, invisible coating to one pane that reflects heat back into the room while still letting daylight in. For most homes it's the best balance of warmth and cost.

Triple glazing

Three panes and two insulating gaps. Triple glazing keeps in more heat and reduces outside noise further, but it is heavier and costs more. It makes most sense for north-facing rooms, very exposed sites, or homes near busy roads.

Other glass options

• Obscure glass keeps privacy in bathrooms and front doors. In our designer you can choose it pane by pane.
• Safety glass (toughened or laminated) is required in doors, next to doors and in low-level panes.

In the window designer you'll see the price difference of each glazing option before you choose.