Double glazing installation cost in the UK
Double glazing installation in the UK typically costs £400–£800 per window for standard uPVC casements, with a full house of 8–12 windows running £5,000–£10,000. Aluminium double glazing is £600–£1,000 per window; timber is £700–£1,300. A-rated units with argon gas and warm-edge spacers improve thermal efficiency and are standard in most mid-range quotes.
Homeowners researching this typically also price up cost of new windows in the uk, cost of damp proofing in the uk and roof replacement cost in the uk. For wider context, browse our bathroom pricing, kitchen pricing and boiler & heating costs.
Cost table
| Item | Typical range (GBP) |
|---|---|
uPVC casement (A-rated) | £400–£650 |
uPVC sash | £550–£850 |
Aluminium casement (A-rated) | £600–£950 |
Timber casement (A-rated) | £700–£1,100 |
Full house (8 windows, uPVC) | £4,000–£6,500 |
Full house (10 windows, uPVC) | £5,000–£8,500 |
Full house (12 windows, uPVC) | £6,000–£10,000 |
Bay window (uPVC, 3 sections) | £1,200–£2,200 |
Labour costs
Installation is usually included in the per-window price. A fitter installs 2–3 windows per day. Scaffolding for upper floors is extra.
| Item | Typical range (GBP) |
|---|---|
Installer (per window, included) | £100–£200 |
Scaffolding (upper floors) | £200–£500 |
Removal & disposal | £20–£50 |
Re-plastering reveals (if needed) | £30–£80 |
Materials costs
Materials include the frame, sealed double-glazed unit, hardware, seals and trickle vents. A-rated units use low-E glass, argon fill and warm-edge spacers.
| Item | Typical range (GBP) |
|---|---|
uPVC frame & hardware | £250–£450 |
Aluminium frame & hardware | £400–£700 |
Timber frame & hardware | £500–£850 |
A-rated sealed unit | £80–£180 |
Trickle vents & seals | £15–£40 |
Factors affecting cost in the UK
- ·Frame material — uPVC is most common and cheapest; timber and aluminium are premium.
- ·Window size and style — large panes, sash mechanisms and bays cost more.
- ·Energy rating — C-rated is entry-level; A-rated is standard; A+ is premium.
- ·Property location — London and rural areas with limited installer choice cost more.
- ·Installation complexity — concrete reveals, narrow access or upper floors add time.
Ways to reduce cost
- ·Replace all windows in one project for volume discounts of 10–20%.
- ·Book in spring or autumn — summer is peak season and prices rise.
- ·Ask for A-rated as standard; C-rated may be cheaper but less efficient.
- ·Use a FENSA-registered installer to avoid separate Building Control fees.
- ·Compare like-for-like quotes: same frame material, energy rating and glass spec.
Frequently asked questions
- What's the difference between C-rated and A-rated double glazing?
- A-rated units lose less heat and keep more warmth in. C-rated is the legal minimum; A-rated saves £30–£50 more per year per window.
- How long does double glazing installation take?
- A full house of 8–10 windows takes 1–2 days. Sash windows and bays may extend to 3 days.
- Does double glazing reduce noise?
- Yes — by 20–40 dB depending on glass thickness and cavity width. Acoustic laminated glass is best for busy roads.
- Can I install double glazing myself?
- DIY installation is possible for experienced renovators but voids most warranties. Use a certified installer for guarantees and Building Control.
- How long does double glazing last?
- uPVC frames last 20–25 years. The sealed units should last 15–20 years; failed units mist between the panes and need reglazing.