Triple glazing sounds like the obvious upgrade, with three panes instead of two. But is it worth the extra cost? The honest answer is: sometimes. Here is how to decide.
Insulation
Triple glazing has better insulation. The best systems reach U-values as low as 0.66 W/m²K, compared with around 1.2 W/m²K for the best double glazing. Interior glass surfaces also stay warmer, which reduces cold spots and condensation.
Noise
An extra pane helps with noise, but the thickness of glass and the gaps matter more than the number of panes. A well-designed double-glazed unit with laminated glass can perform as well as basic triple glazing for sound.
Cost and weight
Triple glazing costs more and the units are heavier, which can mean stronger frames and hinges. The extra cost can take a long time to pay back in energy savings in a typical home.
When triple glazing makes sense
- You are aiming for very low energy use, for example a new build or eco-renovation.
- The room is north-facing, exposed or particularly cold.
- You live on a very noisy road and want the maximum reduction.
- You want the best possible comfort next to large areas of glass.
When double glazing is enough
Modern double glazing already reaches A++ Window Energy Ratings, which is excellent for most homes. We will give you an honest recommendation, and tell you if triple glazing is not worth it for your situation.