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Triple Glazing Explained
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Compare triple glazing with double glazing and understand when improved thermal performance may justify the additional cost, weight and effect on daylight.
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Triple glazing uses three panes and two sealed cavities to reduce heat loss and is increasingly specified in high-performance self-builds. This guide compares three-pane and double-glazed units in terms of thermal performance, weight, cost and daylight.
It helps you judge where the additional pane earns its place rather than treating it as an automatic upgrade. Our window U-values guide explains the performance figures used when comparing products. For the official energy-efficiency requirements, see Approved Document L.
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