How Much Does Double Glazing Cost in 2026 UK?
In 2026 UK, double glazing costs £450–£900 per window fitted, £4,500–£8,500 to do a typical 8–10 window house in uPVC, and £8,000–£18,000 in aluminium or heritage timber. The big price drivers are frame material, window size and count, glass spec (A-rated, triple, acoustic) and access. Here's the full 2026 cost breakdown.
Double glazing cost at a glance — 2026 UK
- Per uPVC window (fitted): £450–£900
- Whole-house uPVC (8–10 windows): £4,500–£8,500
- Aluminium windows (whole house): £8,000–£14,000
- Heritage / timber sash (whole house): £10,000–£18,000
- Triple glazing uplift: +£100–£250 per window
- Acoustic (laminated) glass uplift: +£60–£150 per window
- uPVC front door: £900–£1,600 · composite £1,200–£2,200
A whole-house uPVC job typically takes 1–3 days depending on window count and access; aluminium and bespoke timber run longer due to lead times and trickier fitting. All replacement glazing must be FENSA or CERTASS self-certified, or signed off by Building Control.
Double glazing cost by frame material, 2026 UK
Whole-house figures assume a typical 8–10 window home; terraces sit lower, large detached higher.
Glass upgrades and extras, 2026 UK
What makes double glazing more or less expensive
Beyond frame material, the main drivers are window count and size (bays, bows and large picture windows cost more), glass spec (triple, A-rated, acoustic, toughened, obscure), colour and woodgrain finishes, and access — upper-floor windows needing scaffolding add cost. Two 2026-specific factors are worth planning for: energy efficiency has become a bigger selling point, so A+ rated glass and low-E coatings now come as standard on most quotes rather than as a paid upgrade, and if your main reason for replacing windows is noise rather than heat loss, laminated acoustic glass usually delivers more per pound spent than jumping to triple glazing. If you are still weighing whether the spend stacks up, read is double glazing worth it in 2026, and for street or traffic noise our soundproofing cost guide compares new glazing against secondary glazing and other measures.
All replacement glazing must be FENSA or CERTASS self-certified (or signed off by Building Control) — see our window permission guide. To weigh frame materials see uPVC vs aluminium vs timber, estimate yours with the calculator, or read the full double glazing cost guide. BestBuilders routes every enquiry through our free quote system — we never publish installer contact details.
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Frequently asked questions
Related Guides
More guides to help you plan and budget.
Sources used in our 2026 figures
- FENSA — window & door competent person scheme
- CERTASS — installer certification
- gov.uk — Building Regulations: windows & doors
Methodology: Cost figures use representative quote data from BestBuilders' UK window installer network (June 2026) cross-referenced against trade-supplier pricing. Last updated .