Average Cost of Double Glazed Windows in the UK
What the average double glazed window actually costs in the UK, how that average is calculated, and the regional and specification differences hiding behind a single number.
Key takeaways
- The average double glazed window in the UK costs around £520 supplied and fitted.
- That average covers everything from a £350 fixed light to a £2,600 bay, so it is a starting point, not a quote.
- Homes in London and the South East typically pay 10% to 20% more than the national average.
- Average cost per whole house is a more useful figure: £4,000 to £9,000 for a three-bedroom home.
Average prices are useful for budgeting and dangerous for negotiating. The national average tells you roughly where the market sits; it cannot tell you what your eight windows, two bays and a composite door should cost. Here is where the average comes from, and how to adjust it for your own property.
The average double glazed window price
Across typical UK installations, a double glazed window supplied and fitted averages around £520 including VAT. That figure blends fixed lights, opening casements, tilt and turns, sashes and occasional bays, and assumes white uPVC with A-rated glass.
| Measure | Typical amount |
|---|---|
| Average per window, all types | £520 |
| Median per window, standard casement | £480 |
| Average per whole-house installation | £6,200 |
| Average price per square metre | £380 |
| Average labour share of the quote | 30% – 40% |
Why your quote may be above or below average
- Region. London, Surrey, Sussex and the home counties typically run 10% to 20% above the national average because of labour rates and access. Northern England, Wales and parts of Scotland often sit 5% to 15% below.
- Window mix. A house of eight small casements is cheaper than a house of six windows including two bays, even though there are more windows.
- Frame material. Aluminium and timber routinely double the per-window figure.
- Access. Second floor and above, work over a conservatory or a busy road adds scaffolding at £500 to £1,500.
- Timing. Spring and summer quotes are higher than late autumn and winter quotes for identical work.
Regional variation at a glance
| Region | Average per window | Average 3-bed house |
|---|---|---|
| London | £600 – £700 | £5,000 – £10,500 |
| South East and East | £550 – £650 | £4,500 – £9,500 |
| South West | £520 – £620 | £4,200 – £9,000 |
| Midlands | £480 – £560 | £3,800 – £8,400 |
| North of England | £450 – £540 | £3,500 – £8,000 |
| Scotland and Wales | £460 – £550 | £3,600 – £8,200 |
How to use an average properly
Use the average to screen quotes, not to set your expectation. If three itemised quotes come in at £4,200, £4,800 and £7,900 for the same specification, the average tells you the third is an outlier worth questioning. It does not tell you the lowest quote is the best value, because the cheapest quote is often a smaller scope.
The practical approach is to count your openings, note which are bays or unusual shapes, decide the material, then ask three local installers for the same written specification. Their spread is your real market price.
The bottom line
Around £520 per window is a fair national average for 2026, and £4,000 to £9,000 is the realistic range for a three-bedroom house. Treat any figure far below that as a prompt to read the scope, not as a bargain.
Frequently asked questions
Between £4,000 and £9,000 for seven to nine windows and a front door in white uPVC. Aluminium, bays or triple glazing push the figure towards the top of that range or beyond it.
Generally yes, by 5% to 15% against the national average, mainly because labour and premises costs are lower. Specification differences between installers matter more than region though.
Flats average £400 to £650 per window, but access and any landlord or freeholder consent can add cost. Upper-floor flats may need scaffolding or a hoist.
Usually one of four reasons: aluminium or heritage frames, large or bay windows, difficult access requiring scaffolding, or a quote that includes doors, disposal and making good that the average does not.
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