📅 Updated April 2026 · ⏱ 12 min read · ✍️ Findfitter editorial team
Buying new windows is often the biggest home improvement expense a UK homeowner makes — but the price gap between installers is huge. Two fitters quoting the same spec can differ by £3,000 or more. This guide walks through every cost variable in the 2026 UK market so you know what’s fair, what’s inflated, and how to save.
🔎 TL;DR — 2026 UK double glazing costs
- uPVC windows: £450–£900 installed per window
- Aluminium windows: £650–£1,200 per window (30–40% more)
- Wooden windows: £800–£1,500 per window
- Full 3-bed semi (10 windows): £4,500–£9,000 in uPVC
- 0% finance is widely available — from ~£43/month
- London premium: add 20–30% vs national average
- Comparing 4 quotes saves the average homeowner £2,000
How much does double glazing cost in 2026?
In 2026, the average cost of a replacement double-glazed window in the UK is £650 installed. This covers the window itself, frame, installation labour, removal of the old window, and FENSA certification.
However, that figure is just an average — real prices depend on five things: the material (uPVC, aluminium, wood, composite), the style (casement, sash, tilt and turn, bay), the size, your region, and whether your property has access complications.
The best way to know what your windows should cost is to get quotes from 3–4 independent FENSA-registered installers and compare. That’s exactly what our free comparison tool is built for.
Cost by window material
Material is the single biggest cost driver. uPVC is cheapest (and still the UK’s most popular choice). Aluminium is mid-range. Hardwood and composite are premium.
| Material | Per window installed | Durability | Maintenance |
|---|---|---|---|
| uPVC | £450 – £900 | 25–35 years | None |
| Aluminium | £650 – £1,200 | 30–45 years | Minimal |
| Wood (softwood) | £700 – £1,300 | 15–25 years | Repaint every 5–8 yrs |
| Wood (hardwood) | £800 – £1,500 | 40–60 years | Repaint every 8–12 yrs |
| Composite | £900 – £1,800 | 50+ years | Minimal |
uPVC dominates ~80% of the UK replacement market because it’s affordable, well-insulated, and maintenance-free. The main downside is aesthetics — cheap uPVC can look plasticky on a period property.
Aluminium has slimmer sightlines, which matters for modern or minimalist homes. It’s stronger than uPVC and allows for larger panes. Slightly worse thermal performance than top-tier uPVC, though modern thermal-break aluminium closes the gap.
Wood is the only option allowed in most conservation areas and listed buildings. Hardwood lasts decades but needs periodic repainting. Softwood is cheaper upfront but has a shorter lifespan.
Composite (wood inside, aluminium outside) is the premium choice — best thermal performance, lowest maintenance, longest lifespan. Mostly chosen for high-end new builds or extensions.
Cost by window style
Window style affects price significantly — a bay window is always more expensive than a simple casement because of the installation complexity and frame construction.
| Style | uPVC cost (installed) | Notes |
|---|---|---|
| Casement | £450 – £750 | Most common and cheapest |
| Tilt and turn | £550 – £900 | Dual-function hinges, popular on continental European designs |
| Sash (sliding) | £700 – £1,200 | Traditional, fits Victorian / period homes |
| Bay (3-section) | £1,500 – £2,800 | Price depends on angles and size |
| Bay (5-section) | £2,200 – £3,800 | Common on Edwardian semis |
| French windows | £800 – £1,500 | Often used as patio doors |
Cost by house size (full-house replacement)
Most homeowners replace all windows in one go — it’s cheaper per window and avoids the aesthetic mismatch of mixing old and new frames. Here’s the typical total bill in 2026:
| Property | Typical windows | uPVC total | Aluminium total |
|---|---|---|---|
| 1-bed flat | 3–4 | £1,800 – £3,200 | £2,500 – £4,500 |
| 2-bed terrace | 6–8 | £3,500 – £6,500 | £5,000 – £9,000 |
| 3-bed semi | 8–10 | £4,500 – £9,000 | £6,500 – £12,500 |
| 4-bed detached | 10–14 | £6,500 – £13,500 | £9,000 – £18,500 |
| 5-bed+ house | 14+ | £10,000 – £20,000+ | £14,000 – £30,000+ |
These are real 2026 market ranges from our network of UK installers. Full-house replacements typically get 8–12% discount vs buying windows individually because installation labour is more efficient.
Regional pricing differences
Where you live affects price substantially. London is the most expensive region; Scotland, the North East, and Wales are typically 10–15% below the national average.
| Region | vs national average | Reason |
|---|---|---|
| London | +20% to +30% | Labour costs, parking, access restrictions |
| South East | +10% to +15% | High demand, higher overheads |
| South West | +0% to +8% | Near-average |
| Midlands | -2% to +5% | Near-average |
| North West / Yorkshire | -5% to -10% | Lower labour costs |
| North East | -10% to -15% | Lowest in England |
| Scotland | -8% to -12% | Varies — Edinburgh near-average, Aberdeen higher |
| Wales | -8% to -12% | Lower overheads |
| Northern Ireland | -5% to +5% | Limited installer supply |
What drives the price variation?
Energy rating (A++, A+, A, B)
Windows are rated A++ (best) to E (worst) by the British Fenestration Rating Council (BFRC). An A++ window costs 15–25% more than a basic A-rated window but saves significantly on heating bills. For a 3-bed house, the upgrade pays back in 7–10 years.
Number of opening windows
A fixed (non-opening) pane is ~40% cheaper than an opening one. Don’t over-specify — most rooms only need one opening window for ventilation.
Access and installation complexity
Ground-floor windows with off-street access are simplest. If scaffolding is required (upper floors, difficult access), add £150–£400 per window. Listed buildings or conservation areas may need specialist wooden windows and planning approval — add 30–60% overall.
Glass options
- Standard double glazing: included in base price
- Triple glazing: +£80–£150 per window (worth it if you’re near a motorway or in Scotland)
- Laminated / security glass: +£100–£200 per window
- Obscured (bathroom) glass: +£30–£60 per window
- Leaded / Georgian bar finish: +£80–£150 per window
Hidden costs to watch for
These aren’t always included in the headline quote — always ask:
- Scaffolding — £150–£400 per window on upper floors
- Old window removal & disposal — sometimes £50–£150 extra
- Structural repairs — if the existing frame is rotten, repairs can add £200–£800 per window
- Lead flashing or sill replacement — £50–£200 per window
- VAT — always check if quoted price includes 20% VAT
- FENSA certificate — should be free, but some installers charge £20–£40
⚠️ Red flag: If a quote is much cheaper than competitors, check whether hidden costs are excluded. Always ask for a written breakdown itemising each component.
How to save money on double glazing
1. Compare 3–4 quotes
This is the single biggest money-saver. Across our network, the spread between the highest and lowest quote for the same job is typically £2,000–£4,000. Get 4 free quotes in 2 minutes →
2. Avoid national chains as your only quote
National chains (think Anglian, Everest, Safestyle) spend heavily on TV and direct marketing — those costs are baked into your quote. Local FENSA-registered installers often offer identical quality for 20–40% less. Always include at least 2 local installers in your comparison.
3. Buy off-season
January–March is the quietest time for installers. They’ll often discount 5–15% to fill their winter schedules. Avoid September–November, when demand peaks ahead of winter.
4. Ask about ex-showroom stock
Installers sometimes have cancelled-order windows or showroom models available at 20–40% off. Worth asking if you’re flexible on colour/finish.
5. Don’t sign on the first visit
High-pressure sales tactics — “this price only valid today”, “manager call-in special” — are designed to stop you comparing. Any genuine installer will honour their quote for 14–30 days. Read our full buyer’s guide on handling sales visits.
Financing options for new windows
Most UK installers offer finance — you don’t need to pay the full cost upfront.
- 0% finance (buy now, pay later): 12–24 months interest-free. You pay the full price in fixed monthly instalments. No interest if you pay within the term.
- Interest-free credit: similar, usually 36–60 months.
- Home improvement loan (APR 7–15%): longer terms (5–10 years), lower monthly payments but more total interest.
- Secured home improvement loan: lowest rates (6–9% APR) but uses your home as collateral — only suitable if you have equity and stable income.
A £6,000 full-house uPVC replacement on a 24-month 0% plan is ~£250/month. A 5-year secured loan at 8% is ~£122/month (total £7,300).
Government grants and support (2026)
A few government schemes may reduce your cost if you qualify:
- ECO4 (Energy Company Obligation) — free or subsidised insulation and sometimes new windows for low-income households. Check gov.uk for eligibility.
- Home Upgrade Grant 2 (HUG2) — up to £10,000 for low-income households without mains gas.
- Local council grants — some councils offer home improvement grants for vulnerable households. Check your local authority.
- 0% VAT on energy-saving materials — the 20% VAT is waived on certain energy-efficient upgrades until March 2027.
Frequently asked questions
How much should I pay for a single replacement window in 2026?
A standard uPVC casement window (1200x1200mm) should cost £500–£750 installed in most of the UK in 2026. Anything above £900 for a standard-size window without extras is likely overpriced — get more quotes. Anything below £400 is worth scrutinising (check for hidden costs, installer credentials, and glass quality).
Is double glazing cheaper in summer or winter?
Cheapest in January–March when installers have gaps in their schedule. Most expensive September–November. Expect 5–15% discount off peak if you’re flexible on timing.
Can I get double glazing on finance?
Yes. Most installers offer 0% finance for 12–24 months, or interest-free credit for up to 60 months. Longer terms with interest are also available. A £6,000 replacement typically works out at £120–£250/month depending on term.
Do double glazing installers offer cash discounts?
Some do — usually 2–5% off. However, paying in full upfront removes your leverage if there are defects. We recommend paying a deposit (10–25%) with the balance due on completion, and only pay in full after you’re satisfied with the install.
How long do new windows last?
uPVC windows last 25–35 years. Aluminium 30–45 years. Hardwood (properly maintained) 40+ years. Composite can exceed 50 years. Cheap imported uPVC from rogue traders may fail within 10 years — always choose a FENSA-registered installer for the insurance-backed warranty.
Will new windows really reduce my energy bill?
Yes — a typical 3-bed semi upgrading from single to A-rated double glazing saves £180–£400/year on heating (2026 UK energy prices). The windows themselves pay back in 7–15 years depending on material and house size.
Get your free quotes
The only way to know the real cost for your home is to get actual quotes. Our tool matches you with up to 4 FENSA-registered installers in your area — compare quotes side by side in 2 minutes, no obligation, no spam.
Get real prices for your home
Enter your postcode — 4 actual quotes from FENSA-registered installers in your area.
- All buyer’s guides →
- How to Choose a Double Glazing Fitter (coming soon)
- uPVC vs Aluminium vs Wood — Which Is Best? (coming soon)
- FENSA vs Certass vs Trustmark Explained (coming soon)
- Before You Sign a Double Glazing Contract (coming soon)
Sources & references
This article draws on data and guidance from the following authoritative UK sources:
- FENSA — Find an installer database — verified UK installer credentials and coverage data
- Energy Saving Trust — windows advice — energy savings and insulation data for UK homes
- British Fenestration Rating Council (BFRC) — window energy rating methodology (A++ to E)
- Ofgem — UK energy regulator — current UK energy price data for bill savings calculations
- Office for National Statistics — price indices — UK construction and materials price trends
- GOV.UK — ECO4 scheme — eligibility for subsidised home energy-efficiency upgrades
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