When the third pane earns its money, and when better double glazing is the smarter spend.
Triple glazing is not automatically better — it is better for specific problems. Knowing which problem you are solving prevents you paying for performance you will not notice.
This guide sets out where the upgrade makes a real difference.
A third pane and second cavity lower heat loss through the glass. In a well-sealed, well-insulated home the improvement is worthwhile; in a house that still has significant draughts or poor loft insulation, the money goes further elsewhere first.
For traffic noise, asymmetric double glazing with a laminated acoustic pane often outperforms standard triple glazing. If noise is your main driver, ask about acoustic laminated units before you ask about triple.
Triple units are heavier, which means hardware and frame depth have to suit. This is a specification detail worth confirming, particularly on large openers.
We'll quote double and triple against the same windows so the decision is based on numbers, not opinion.
It reduces internal surface condensation because the inner pane stays warmer, but ventilation and humidity are still the main factors.
Often acoustic laminated double glazing is the better answer for traffic noise. We'll advise based on the noise source.
Marginally, because of the extra pane and coatings. On north-facing rooms it is worth discussing.