Double Glazing Cost UK 2026: Windows by Material, Style + Whole House
UK double glazing in 2026 costs £400-700 per uPVC window, £700-1,400 per aluminium window and £900-1,800 per timber window, all fitted. A full 3-bed semi (8-10 windows) runs £4,000-9,000. This guide uses verified Q2 2026 pricing from FENSA + CERTASS registered installers across 519 UK towns — by frame material, window style, glazing spec and house size.
UK Double Glazing Cost 2026: 30-Second Answer
UK double glazing costs in Q2 2026 depend on frame material: uPVC £400-700 per window (most popular, best value), aluminium £700-1,400 (slim sightlines, modern), timber £900-1,800 (period + conservation), composite £800-1,500. A full house of 8-10 windows runs £4,000-9,000 in uPVC, £7,000-14,000 in aluminium, £9,000-18,000 in timber.
Triple glazing adds 20-40% over double (better thermal + acoustic). Bay windows cost 2-3× a standard casement. All replacement windows must be FENSA or CERTASS certified (Building Regs self-certification) — or notified to Building Control.
Bottom line: uPVC A-rated double glazing is the right choice for 80% of UK homes — 20-30 year lifespan, low maintenance, strong thermal performance. Choose aluminium for large modern glazing, timber/composite where conservation rules or appearance demand it.
UK Double Glazing Cost by Frame Material 2026
| Frame Material | Per Window Fitted | Whole House (8-10) | Lifespan | Best For |
|---|---|---|---|---|
| uPVC | £400-700 | £4,000-9,000 | 20-30 years | Most homes, best value, low maintenance |
| Composite | £800-1,500 | £8,000-15,000 | 30-40 years | Timber look + low maintenance hybrid |
| Aluminium | £700-1,400 | £7,000-14,000 | 30-45 years | Modern, slim sightlines, large glazing |
| Timber | £900-1,800 | £9,000-18,000 | 40-60 years (maintained) | Period homes, conservation, listed |
Includes supply + fit + removal of old windows + FENSA/CERTASS certificate. Triple glazing +20-40%. London + South-East +15-25%. Bay windows 2-3× standard casement.
UK Window Cost by Style 2026
| Window Style | uPVC Fitted | Notes |
|---|---|---|
| Casement (standard) | £400-700 | Most common UK window, hinged opening |
| Sash (uPVC vertical slider) | £600-1,100 | Period look, mimics traditional timber sash |
| Bay / Bow Window | £1,200-2,800 | 2-3× standard, multiple panels + structural |
| Tilt-and-Turn | £500-900 | Inward tilt for ventilation, easy clean |
| Fixed / Picture Window | £350-650 | Non-opening, cheapest, maximum glass |
Glazing spec: A-rated double glazing is the standard. A++ rated + triple glazing improve thermal/acoustic performance. Acoustic laminated glass adds £80-200/window for noise reduction near roads/railways.
Get Free Quotes from FENSA / CERTASS Installers
Answer 4 quick questions and we'll match you with up to 3 FENSA or CERTASS-registered window installers in your area. Compare frame material, style + glazing spec side-by-side. No upfront cost. No commitment.
UK Double Glazing Cost FAQ · 2026
UK double glazing Q2 2026: uPVC £400-700 per window, composite £800-1,500, aluminium £700-1,400, timber £900-1,800, all fitted. Full house (8-10 windows): uPVC £4,000-9,000, aluminium £7,000-14,000, timber £9,000-18,000. Triple glazing +20-40%. Bay windows 2-3× standard. London/SE +15-25%.
A typical 3-bed UK semi (8-10 windows) costs £4,000-9,000 in uPVC double glazing in 2026, £7,000-14,000 in aluminium, £9,000-18,000 in timber. The price depends on window count, sizes, styles (bay windows add significantly) + frame material. Most installers offer a whole-house discount of 5-15% vs per-window pricing. All windows come with a FENSA/CERTASS certificate, required when you sell.
uPVC (£400-700/window) is best value for 80% of UK homes — excellent thermal performance, 20-30 year lifespan, no maintenance. Aluminium (£700-1,400/window) has slimmer sightlines (more glass, less frame), a more modern look + longer lifespan (30-45 years), suiting contemporary homes + large glazing. For pure value uPVC wins; for appearance + large windows, aluminium. Timber/composite for period + conservation properties.
Triple glazing costs 20-40% more than double glazing + delivers better thermal performance (U-value ~0.8 vs ~1.2-1.4 for A-rated double) + significantly better acoustic insulation. It's worth it if: your home is very exposed/cold, you're near a noisy road or railway, or you're targeting Passivhaus/very-low-energy standards. For most UK homes, A-rated double glazing offers the best cost-to-benefit — the extra thermal gain from triple rarely pays back the premium in energy savings alone.
Replacement windows must comply with Building Regulations (Part L thermal + Part Q security on new builds). Using a FENSA or CERTASS-registered installer means they self-certify the work — you get a certificate without involving Building Control. If you use a non-registered fitter, the work must be notified to + inspected by Building Control (£200-400). The FENSA/CERTASS certificate is required by conveyancing solicitors when you sell, so always use a registered installer.
Where Our 2026 Double Glazing Data Comes From
- FENSA + CERTASS Q2 2026 installer pricing
- GGF (Glass + Glazing Federation) standards
- Building Regs Part L — window U-value requirements
- 519-town window installer quote dataset Q2 2026
- Frame material + glazing spec cost modelling
- RICS BCIS Q2 2026 labour index
All cost ranges reflect quotes from FENSA/CERTASS-registered installers in Q2 2026 across 519 UK towns. Editorial standards: /editorial-standards.