Costs · Updated June 2026

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.

Per window & whole house uPVC · Aluminium · Timber A-rated & triple glazing
Get 3 Free Double Glazing Quotes →Quick Answer
Vetted UK Tradespeople
Verified Customer Reviews
Min £2m Public Liability
Free Quotes
By the BestBuilders Editorial Team
Researched, written & fact-checked by our editorial team. Reviewed . How we research & fact-check
Quick Answer

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.

By Material

Double glazing cost by frame material, 2026 UK

Whole-house figures assume a typical 8–10 window home; terraces sit lower, large detached higher.

Frame materialPer window (fitted)Whole house (8–10 windows)Best for
uPVC£450–£900£4,500–£8,500Value, low maintenance
Aluminium£700–£1,400£8,000–£14,000Slim frames, modern look
Timber / heritage sash£900–£1,800£10,000–£18,000Period & conservation homes
Composite (timber-alu)£900–£1,600£9,000–£16,000Looks + low upkeep
Glass & Extras

Glass upgrades and extras, 2026 UK

UpgradeWhat it addsCost
A-rated / A+ glassBetter insulation (low-E, argon)Often included / +£0–£40/window
Triple glazingBest thermal & acoustic+£100–£250/window
Acoustic (laminated) glassCuts traffic/street noise+£60–£150/window
uPVC front doorMatching entrance door£900–£1,600
Composite front doorHigher security & insulation£1,200–£2,200
What Drives Price

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.

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.

Free Quotes

Compare Double Glazing Quotes from Vetted Installers

BestBuilders matches you with up to 3 vetted window installers. Compare real fitted prices, check FENSA/CERTASS registration and reviews, and choose with confidence — free.

Start your free quote → Double Glazing →

Get My 3 Free Quotes
60 seconds · No spam · No obligation
FAQ

Frequently asked questions

£450–£900 per window fitted for standard uPVC, depending on size, style (casement, tilt-and-turn, sash) and glass spec. Bay windows, large picture windows and feature shapes cost more. Aluminium and timber frames are significantly higher.
A typical 8–10 window house costs £4,500–£8,500 in uPVC, £8,000–£14,000 in aluminium, and £10,000–£18,000 in heritage or timber sash. Terraced houses sit at the lower end; large detached homes with bays at the higher end.
Triple glazing adds roughly £100–£250 per window. It's worth it for new-builds, very cold or exposed locations, and where you want the best acoustic and thermal performance. For most existing UK homes, good A-rated double glazing already delivers the bulk of the benefit.
Yes. Replacement windows are notifiable under Building Regs. Use a FENSA- or CERTASS-registered installer and they self-certify the work (you get a certificate for conveyancing), or you notify Building Control directly. Skipping this can cause problems when you sell.
Frame material (aluminium and timber cost far more than uPVC), window size and count, glass upgrades (triple, A-rated, acoustic, obscure, toughened), bay/bow configurations, awkward access and scaffolding, and colour/woodgrain finishes all push the price up.
Keep Reading

Related Guides

More guides to help you plan and budget.

Double Glazing Cost UK 2026

Full fitted pricing per window and whole house.

Read Guide →

uPVC vs Aluminium vs Timber Windows

Frame materials compared on cost, looks and lifespan.

Compare →

Double Glazing Cost Calculator

Estimate your whole-house price in a minute.

Use Calculator →
Sources

Sources used in our 2026 figures

Methodology: Cost figures use representative quote data from BestBuilders' UK window installer network (June 2026) cross-referenced against trade-supplier pricing. Last updated .

Ready to Start?

Get 3 Free Double Glazing Quotes

Tell us your window count, style and postcode. We'll match you with up to 3 vetted, FENSA/CERTASS-registered installers — free, no obligation.

Get 3 Free Quotes →Start Your Quote