How Much Does Double Glazing Cost in 2026?
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Prices are estimates based on UK market averages for 2026. Actual costs vary by supplier, location and property. Always get 3 quotes before committing.
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What Affects the Cost?
Double glazing prices vary widely. Here are the biggest factors that move your final figure up or down:
- Number of windows the single biggest driver of total cost.
- Window style sash and bay windows cost far more than standard casements.
- Frame material uPVC is cheapest, aluminium mid-range, timber the most expensive.
- Double vs triple glazing triple adds roughly 10 to 20% to the price.
- Installation complexity listed buildings, upper floors and scaffolding add cost.
- Location London and the South East are typically 15 to 25% more expensive.
Frame Material, Relative Cost
Glazing, Relative Cost
2026 Price Guide
Typical UK supply & fit prices, use the tabs to compare
| Window Style | uPVC | Aluminium | Timber |
|---|---|---|---|
| Casement | £400–£1,000 | £540–£1,350 | £760–£1,900 |
| Sash | £600–£1,500 | £950–£2,030 | £1,330–£2,850 |
| Tilt & Turn | £500–£1,200 | £680–£1,620 | £950–£2,280 |
| Bay (per bay) | £1,100–£3,000 | £1,490–£4,050 | £2,090–£5,700 |
| Fixed | £220–£440 | £300–£590 | £420–£840 |
| French Doors | £1,100–£2,200 | £1,490–£2,970 | £2,090–£4,180 |
| Bifold Doors | £2,200–£5,500 | £2,970–£7,430 | £4,180–£10,450 |
| Material | Typical per window | Best for |
|---|---|---|
| uPVC | £400–£1,000 | Best value, low maintenance, excellent insulation |
| Aluminium | £540–£1,350 | Slim frames, modern look, very durable |
| Timber | £760–£1,900 | Period and listed properties, premium finish |
| Property Type | Typical windows | Full-house range |
|---|---|---|
| Flat | 4 windows | £1,800–£5,000 |
| Terraced | 7 windows | £3,200–£7,000 |
| Semi-Detached | 10 windows | £4,000–£10,000 |
| Detached | 14 windows | £7,000–£16,500 |
Prices include supply and installation. Costs vary by region, London & the South East are typically 15–25% higher.
Real-World Examples
See what homeowners like you typically pay
Window Types Guide
Hover a card to see the pros, cons and best fit
Casement
£400–£1,900
Pros: Affordable, great seal, versatile.
Cons: Limited opening styles.
Best for: Most modern UK homes.
Sash
£600–£2,850
Pros: Classic period look, great ventilation.
Cons: Pricier, more maintenance.
Best for: Victorian and period homes.
Tilt & Turn
£500–£2,280
Pros: Flexible opening, easy to clean.
Cons: Bulkier frames.
Best for: Flats and upper floors.
Bay
£1,100–£5,700
Pros: Adds space and light, kerb appeal.
Cons: Expensive, complex fit.
Best for: Living rooms and period fronts.
French Doors
£1,100–£4,180
Pros: Elegant, wide opening to the garden.
Cons: Needs clearance space.
Best for: Patios and dining rooms.
Bifold Doors
£2,200–£10,450
Pros: Fully opens, stunning indoor-outdoor flow.
Cons: Premium price.
Best for: Modern extensions and kitchens.
Our Most Popular Calculators
Drill into a single window style, material or job with a focused tool
uPVC Window Calculator
The default for most UK homes. Price fitted uPVC casement, sash and tilt-and-turn windows.
Casement Window Calculator
The cheapest, most common style, priced in any frame material.
Sash Window Calculator
Vertical sliding sash windows for Victorian and Georgian homes, in uPVC or timber.
Bay Window Calculator
Projecting bay windows priced per bay, including the structural fitting work.
Door Cost Calculator
Front, French, patio and bifold doors, supply and fit, in uPVC, composite and aluminium.
Energy Savings Calculator
See how much A-rated double glazing could trim from your annual heating bill.
Compare Your Options Side by Side
The decisions that move your final bill the most
uPVC vs Aluminium
Slim modern frames against the budget default — looks, lifespan and the price gap.
Double vs Triple Glazing
Is the third pane worth it? Heat loss, noise and payback compared.
Supply-Only vs Fully Fitted
Fit it yourself or pay for installation — what each route really costs.
uPVC vs Timber
Low-maintenance plastic against authentic wood for period and conservation homes.
Repair vs Replace
Misted or draughty units? When a fix beats a full replacement.
Casement vs Sash
Two classic styles compared on cost, looks and which suits your home.
Learn How Double Glazing Pricing Really Works
Plain-English guides to specs, costs and avoiding a bad quote
Cost Per Window
What a single window really costs in 2026, broken down by style and material.
Is Double Glazing Worth It?
The payback maths on bills, comfort and resale value.
How to Avoid Being Overcharged
The sales tactics to watch for and how to read a quote like an installer.
U-Values Explained
What the U-value on your quote means, and why a lower number is better.
FENSA Explained
Building-regs sign-off, certificates, and why they matter when you sell.
Single vs Double vs Triple
How each glazing type performs on heat loss, noise and cost.
Double Glazing Costs by House Size & Region
See where your home and postcode land on the 2026 price range
Cost by House Size
Whole-house prices for a flat, terrace, semi and detached home.
Cost by Region
How double glazing prices shift across the UK, from the North to London.
Cost by Glass Spec
What argon fill, Low-E coatings and A+ rated glass add to the bill.
London Prices
London double glazing costs and the capital's installation premium.
Manchester Prices
Typical Manchester and North West window replacement costs.
Birmingham Prices
Midlands pricing for a full window replacement project.
Latest Grants & Policy Updates
Changes to EPC rules, grants and schemes that affect window costs
The Warm Homes Plan 2026 explained
The government's roughly £15bn home-energy programme reshapes window grants.
Landlords must hit EPC C by 2030
England and Wales rentals need EPC C by October 2030, with a £10,000 cost cap.
ECO4 extended to December 2026
ECO4 gains a nine-month extension to 31 December 2026, with no successor scheme after.
EPCs are changing: the Home Energy Model
A new fabric-first EPC system from October 2029 puts windows front and centre.
Independent, sourced and free
No salespeople, no inflated numbers — just installer-checked 2026 costs.
Checked by a FENSA-registered installer
Every price range is reviewed by Tom Bradley, a FENSA-registered installer, against real 2026 quotes — not scraped averages.
Transparent, sourced 2026 pricing
We publish where our numbers come from and how each estimate is built, so you can sanity-check the figure yourself.
No signup, no lead-selling
Use every calculator free, with no email wall. We only pass your details to an installer if you ask us to.
Ranges, not false precision
Real quotes vary with access, glass spec and region, so every tool returns a low-to-high range instead of one misleading number.
Frequently Asked Questions
Everything UK homeowners ask about double glazing costs
Most UK homeowners pay between £4,000 and £10,000 to replace all windows in an average semi-detached house in 2026. A flat might cost £1,800 to £5,000, while a large detached home can reach £7,000 to £16,500 or more, depending on the number of windows, frame material and glazing.
Yes. uPVC is the most affordable frame material, typically around 35% cheaper than aluminium and roughly 90% cheaper than timber, while still delivering excellent thermal performance. Aluminium costs more but offers slimmer frames and a sleek, modern look.
Triple glazing adds roughly 10 to 20% to the price. It improves insulation and noise reduction, making it most worthwhile in colder regions, near busy roads, or for very energy-conscious homes. For many homes, good-quality A-rated double glazing offers the best value.
A typical installer fits 4 to 6 windows per day, so an average house is usually completed in 1 to 3 days. Larger homes or complex installs such as bay windows can take a little longer.
Usually not. Replacing like-for-like windows falls under permitted development. However, listed buildings and homes in conservation areas often need consent, so always check with your local planning authority first.
Replacing single glazing with A-rated double glazing can save up to around £140 a year on a typical semi-detached house, according to the Energy Saving Trust. The exact figure varies by house size, region and your current windows.
The main routes changed in 2026. ECO4 was extended and now runs to 31 December 2026, with no successor scheme after it. In England, the Warm Homes: Local Grant is the headline scheme, offering up to £15,000 for fabric measures including glazing (plus up to £15,000 for low-carbon heating) for lower-income households in EPC bands D to G. Scotland has Home Energy Scotland loans, and only around 15% of households qualify for funding overall, so check eligibility before assuming free windows.
Quality double glazing lasts around 20 to 25 years for uPVC frames, 30 to 40 years for aluminium, and 30 to 60 years for well-maintained timber. The sealed glass unit itself typically lasts 15 to 20 years before any misting. Most reputable installers offer a 10-year guarantee.
Installers are often quieter (and sometimes cheaper) in autumn and winter, so you may get better deals. Installation can be done year-round, because fitters only remove one window at a time, so your home is not left exposed.