Double Glazing Costs in Wales 2026
Double glazing prices in Wales in 2026 depend on frame material (uPVC, aluminium, timber), window style, and number of windows. Prices have stabilised after the post-pandemic material cost increases.
Standard uPVC double glazing, supply and install (Wales 2026):
| Window style | Small (600×900mm) | Medium (900×1200mm) | Large (1200×1500mm) |
|---|---|---|---|
| Casement | £350–£600 | £450–£750 | £600–£1,000 |
| Tilt-and-turn | £400–£700 | £500–£850 | £700–£1,150 |
| Fixed light | £280–£500 | £380–£650 | £500–£850 |
| Bay (3-pane) | , | £900–£1,600 | £1,200–£2,200 |
Aluminium double glazing: Add 40–70% to uPVC prices above.
Full-house replacement costs (Wales, 2026):
| Property | uPVC (approx) | Aluminium (approx) |
|---|---|---|
| 2-bed terrace | £2,500–£4,500 | £4,000–£7,000 |
| 3-bed semi | £3,500–£6,500 | £5,500–£9,500 |
| 4-bed detached | £5,000–£10,000 | £8,000–£15,000 |
Watch out for: Double glazing companies operating in Wales vary significantly in quality and pricing. National chains sometimes charge significantly more than local installers for the same specification, always get 2–3 quotes.
Energy Savings from New Glazing
Replacing single-glazed windows with modern A-rated double glazing in a Welsh 3-bedroom semi typically saves £100–£250 per year on heating bills, depending on existing glazing quality and heating system.
The savings are somewhat lower in Wales than the UK average due to milder winters, but the combination of draught reduction, noise reduction, and reduced condensation makes new glazing worthwhile for most Welsh properties with older windows.