Triple glazing Cost Calculator
In 2026, triple glazing in the UK typically costs £550–£1,200 per window supplied and fitted in uPVC, rising to £1,100–£2,500 for sash and £2,000–£4,500 for a bay. A full house comes in around £4,800–£9,500 for eight windows…
Open the calculator →Price triple glazing in 30 seconds
2 steps, using the figures from our cost guide.
How this calculator works
Every figure in this calculator is the one published in the cost table on our triple glazing guide. Pick the option that matches your job and the calculator returns that published range, adjusted for your region - it does not model anything the guide does not already say.
That is deliberate. A calculator whose rates drift from the page it sits under is worse than no calculator, because two numbers on the same site disagree.
What it cannot know: access, the condition of what is already there, and anything structural. Those are what separate three real quotes from each other.
Published triple glazing costs (2026)
| Option | Typical 2026 cost | Notes |
|---|---|---|
| Casement (uPVC) | £500–£700 | |
| Fixed / picture pane | £450–£620 | |
| Tilt-and-turn | £600–£820 | |
| Sash (uPVC) | £1,100–£1,500 | |
| Bay (3–5 panes) | £2,000–£2,800 |
These are the figures from our triple glazing cost guide.
What actually moves a triple glazing quote
The calculator gives you a fair budget figure, but three fitters quoting the same window can still land some way apart. It’s usually down to a handful of things a dropdown can’t see.
Frame material. uPVC is the baseline these figures are built on. Aluminium tends to add roughly 20–35% for its slimmer sightlines, and timber 40–70% or more once you count the finish and the upkeep. If an aluminium or timber quote looks unusually low, check which frame you’re actually being priced for.
The glass, not just the frame. Triple glazing lives or dies on the unit spec – the gas fill (argon is standard; krypton costs more but lets the panes sit closer), a warm-edge spacer, and the low-E coatings. A cheap triple unit can underperform a good double one, so ask for the whole-window U-value in writing rather than settling for the words “triple glazed”.
Access is the other big variable. Anything above the ground floor may need a tower or light scaffold, and a bay or a wide opening needs more hands to lift the heavier triple units safely. Stripping out and disposing of the old frames, making good the reveals, and fitting trickle vents to satisfy Part F all sit on top of the glass price – none of which a 30-second estimate can know about your house.
Whoever fits the windows should register the work with FENSA or a similar competent-person scheme, or notify building control directly. That certificate matters when you come to sell, so it’s worth confirming it’s included rather than assuming it is.
Triple glazing calculator — FAQs
Sometimes. In the UK’s relatively mild climate, triple glazing is most worth it for new builds and major renovations, cold or exposed homes, and noisy locations where you want more comfort and less noise. If you already have good A-rated double glazing, the energy saving is small and the payback can run into decades — so it’s better seen as a comfort-and-quality upgrade than a fast money-saver.
Triple glazing typically costs 20–40% more than equivalent double glazing. On a medium uPVC casement that’s often £150–£300 extra per window, and across a whole house it can add £1,500–£4,000 or more. A triple-glazed uPVC casement usually costs £550–£1,200 fitted, versus roughly £450–£900 for double.
In 2026, expect around £3,000–£6,000 for five windows, £4,800–£9,500 for a typical eight-window semi, £7,000–£14,000 for twelve windows and £9,000–£18,000 for fifteen, in standard uPVC. Aluminium adds roughly 20–35% and timber 40–70% or more. Sash windows and bays cost considerably extra.
A little. Upgrading from single glazing or failed old units to triple gives a real saving. But upgrading from good modern double glazing usually saves only around £30–£60 a year for a typical home, because the glass is a small part of total heat loss. If cutting bills is your priority, loft, wall and floor insulation and draught-proofing generally pay back much faster.
Related cost guides
- Triple glazing cost guide — The full price guide
- All double glazing services — Browse the hub
- All BestBuilders services — Every trade we cover
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