UK price guide · Updated 26 Sep 2026
Triple Glazing Prices
Triple glazing normally adds a premium rather than creating a completely separate window price. For a 1200×1200 standard white uPVC example, the current model moves from around £526 double glazed to about £615 triple glazed.
Current price examples
These examples come from the same pricing model used by the calculator. They are market estimates rather than binding installer quotations.
The premium is not identical everywhere
A triple-glazing upgrade changes glass weight, spacer and unit specification, and sometimes the frame or hardware specification. Supplier data shows that the percentage uplift varies by window type rather than following one universal rule.
That is why the calculator applies product-specific glazing adjustments instead of a single fixed amount for every window and door.
Before paying extra, compare
- Whole-window U-value (Uw), not just glass Ug
- Frame material and profile system
- Acoustic and security specification
- Whether the quote includes fitting and VAT
What “fitted” means here: supply, standard replacement installation and ordinary 20% VAT are included. Unusual access, scaffolding, structural repairs, planning/listed-building requirements and highly bespoke work can sit outside the standard estimate.
Related price guides
Compare closely related products before using the calculator for your exact specification.
Questions people ask
Short answers to the most useful questions around this price topic.
How much more does triple glazing cost?
For the standard 1200×1200 uPVC example here, the model adds about £89 to the fitted centre, or roughly 17%.
Is triple glazing always worth it?
That depends on the property, thermal target, noise exposure and quote. Price alone cannot answer it.
Does triple glazing reduce the cost range?
No. Installer and specification variation still exists, so the calculator continues to show a range.
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