If you’re weighing up new windows, the first question is almost always the same: how much does double glazing cost? The short answer for 2026 is that a single double glazed window costs between £400 and £2,000 installed, depending mainly on the frame material, the window style and the size of your home. A typical 3-bedroom house usually lands somewhere between £4,000 and £7,000 for a full set.
Below we break down double glazing prices by material, window style and house size, explain what actually drives the cost up or down, and cover the grants and savings that can soften the bill. Prefer a figure tailored to your home? Get a free, no-obligation quote and we’ll give you an exact price.
Average double glazing cost per window in 2026
Most UK installers quote a single price per window that bundles the materials and the labour together. As a rough guide, here’s what you can expect to pay per window, fully fitted, in 2026:
| Frame material | Cost per window (fitted) | Best for |
|---|---|---|
| uPVC | £400 – £900 | Most homes; best value |
| Aluminium | £700 – £1,600 | Modern looks, large openings, slim frames |
| Timber / wood | £900 – £2,000+ | Period and listed properties |
| Triple glazing (uPVC) | £550 – £950 | Maximum insulation and noise reduction |
uPVC remains the most popular and affordable choice for UK homes — it’s low-maintenance, well-insulated and available in a wide range of colours and finishes. Aluminium and timber cost more but suit specific styles and properties.
Cost by window style
The shape and mechanism of a window matters just as much as the frame. More complex windows take longer to manufacture and fit, so they cost more:
| Window style | Typical cost per window (fitted) |
|---|---|
| Casement (standard) | £400 – £900 |
| Tilt & turn | £500 – £1,000 |
| Bay or bow | £900 – £2,500 |
| Sash | £700 – £1,500 |
Sash and bay windows sit at the higher end because they have more complex mechanisms and take longer to install. Standard casement windows are the most budget-friendly option.
Double glazing cost by house size
Because most quotes are priced per window, the total cost scales with how many windows your home has. Here’s a ballpark for a full uPVC casement replacement:
| Property size | Approx. windows | Estimated total cost |
|---|---|---|
| Flat / small home | 4 – 6 | £2,000 – £4,500 |
| 2–3 bed semi | 8 – 10 | £4,000 – £7,000 |
| 4-bed detached | 12 – 15 | £7,000 – £12,000+ |
The good news: the more windows you replace at once, the better the per-window rate tends to be, as fixed setup and access costs are spread across the job.
What affects the price of double glazing?
Two quotes for the same number of windows can differ by thousands. These are the biggest factors:
- Frame material — the single largest cost driver, with up to a 50% swing between uPVC and timber.
- Window size and style — larger panes and complex styles (bay, sash) cost more.
- Glass and energy rating — A-rated and triple glazing cost more upfront but save more on bills.
- Access — upper-floor and hard-to-reach windows may need scaffolding.
- Finish and extras — coloured foils, flush sashes, heritage bars, obscure or acoustic glass and upgraded locks all add cost.
- Installation — fitting typically accounts for 20–40% of the total, around £200–£400 per window.
Is double glazing worth the money?
For most homeowners, yes. Replacing old single glazing with A-rated double glazing can save up to £175 a year on heating bills, according to the Energy Saving Trust — savings that add up to thousands over the lifetime of the windows. Double glazing also adds roughly 5–10% to a property’s value and cuts down outside noise, draughts and condensation.
Lifespan varies by material: uPVC windows typically last 20–25 years, aluminium 25–30+ years, and well-maintained timber 30 years or more.
Are there grants for double glazing?
Government support has changed in 2026. The older ECO4 scheme closed in March 2026, but eligible households in England may still get help through the Warm Homes: Local Grant (worth up to £30,000 for qualifying homes), generally aimed at households with a lower income and an EPC rating of D to G. Scotland, Wales and Northern Ireland run their own separate schemes with different eligibility rules. It’s worth checking your eligibility before you commit, as it can significantly reduce or even cover the cost.
One more saving worth knowing: energy-saving materials like double glazing currently benefit from 0% VAT in the UK, so the price you’re quoted shouldn’t have VAT added on top.
How to get the best price (and a quality job)
- Get at least three quotes so you can compare like for like rather than just chasing the lowest number.
- Check the installer is FENSA or CERTASS registered — this confirms the work meets building regulations and is properly certified.
- Ask what the guarantee covers — a strong installer backs their windows with a 10-year guarantee.
- Be wary of high-pressure “today only” discounts — a fair price should still be there tomorrow.
Get an accurate quote for your home
Every home is different, so the only way to know your real cost is to get a proper measure-up and quote. As FENSA-registered double glazing experts, we’ll give you a clear, honest price with no pressure and no hidden VAT. Request your free quote today and find out exactly what new windows will cost for your property.
Frequently asked questions
How much does it cost to double glaze a 3-bed house in the UK?
For a typical 3-bedroom house with 8–10 windows, expect to pay around £4,000 to £7,000 for uPVC double glazing, fully supplied and fitted. The exact figure depends on window styles, sizes and the frame material you choose.
How much is one double glazed window?
A single uPVC casement window typically costs £400 to £900 installed. Aluminium runs £700 to £1,600, and timber £900 to £2,000 or more, depending on size and specification.
Is triple glazing worth the extra cost over double glazing?
Triple glazing offers better insulation and noise reduction, costing roughly £550 to £950 per uPVC window. It’s especially worth considering for north-facing rooms, very cold areas or homes near busy roads. For most homes, A-rated double glazing already delivers excellent performance.
Does double glazing add value to a property?
Yes — quality double glazing can add around 5–10% to a property’s value, while also improving energy efficiency, security and kerb appeal.
How long does double glazing last?
uPVC double glazing typically lasts 20–25 years, aluminium 25–30+ years, and well-maintained timber frames 30 years or more.
