Average Cost of Replacement Windows in the UK (2026 Price Guide)
The average cost of replacement windows in the UK typically ranges from £500 to £1,200 per window installed in 2026. Replacing windows is one of the most common home improvement projects in the UK, helping improve energy efficiency, comfort, and property value.
Supply-only prices are lower, often starting from around £250 to £450 for standard uPVC windows, while larger windows or premium materials such as aluminium or timber can cost significantly more depending on the specification.
The final price depends on several factors including window size, frame material, glazing specification and installation complexity.
This guide explains:
- how much new windows cost in the UK
- replacement windows cost by type
- typical installation costs
- price differences between materials
- real examples of whole house window replacement costs
Understanding these factors can help homeowners estimate realistic budgets before requesting quotes. You can also use our window cost calculator and browse our windows buying guides before comparing quotes.
Estimate Your Window Replacement Cost
Trying to work out how much your new windows might cost? Use our free window cost calculator to estimate the price of replacement windows based on the size, style and number of windows in your home. It takes less than a minute and gives you a realistic starting point before requesting quotes.
How Much Do New Windows Cost in the UK?
The cost of new windows varies widely depending on style and materials.
Typical replacement window prices in the UK are:
| Window type | Supply price | Installed price |
|---|---|---|
| uPVC casement window | £250 – £450 | £500 – £800 |
| uPVC sliding sash window | £350 – £650 | £700 – £1,100 |
| Aluminium window | £600 – £1,000 | £900 – £1,500 |
| Timber window | £700 – £1,200 | £1,000 – £1,800 |
These prices represent common installations in the UK market in 2026.
Smaller windows may cost less, while large bay windows, structural openings, or specialist glazing options will increase the price.
Many homeowners replace several windows at the same time, which often reduces the price per window.
Average Cost of Replacement Windows by Property Type
Another useful way to estimate window replacement costs is by house size.
Most properties have predictable numbers of windows depending on the layout.
Typical replacement costs are shown below.
| Property type | Typical number of windows | Estimated cost |
|---|---|---|
| Flat or apartment | 4 – 6 | £2,000 – £4,500 |
| 2 bedroom house | 6 – 8 | £3,500 – £6,000 |
| 3 bedroom house | 8 – 12 | £4,500 – £9,000 |
| 4 bedroom house | 12 – 16 | £7,000 – £14,000 |
These estimates assume standard sized uPVC windows with professional installation.
Premium materials such as timber or aluminium will increase these figures.
Replacement Window Costs by Window Style
The style of window also affects the price.
Different window types require different mechanisms and manufacturing processes.
Casement Windows
Casement windows are the most common window type in the UK.
They open outward on hinges and are relatively simple to manufacture.
Typical costs:
Supply price
£250 – £450
Installed price
£500 – £800
Casement windows are popular because they offer good energy efficiency at relatively low cost. You can also compare uPVC casement windows, aluminium casement windows, heritage aluminium casement windows, flush casement windows and timber casement windows.
Sliding Sash Windows
Sliding sash windows are common in period properties and conservation areas.
They have a more complex mechanism involving sliding sashes and balances.
Typical costs:
Supply price
£350 – £650
Installed price
£700 – £1,100
Because they are more complex to manufacture, sash windows typically cost more than casement windows. You can also explore uPVC sash windows, mechanically jointed sash windows, aluminium sliding sash windows, timber sash windows, and Ecoslide sash windows, as well as Georgian bar uPVC sash windows.
Bay Windows
Bay windows involve several individual window units combined together.
They are often larger and more complex to install.
Typical costs:
£1,200 – £3,500 depending on size.
For period properties or shaped openings, you may also want to compare Edwardian windows and shaped windows.
Cost of New Windows UK by Frame Material
The material used for the window frame significantly affects the overall price.
uPVC Windows
uPVC windows are the most popular option in the UK because they are affordable, durable, and require very little maintenance.
Typical supply price
£250 – £450
Typical installed price
£500 – £800
They also offer excellent energy efficiency when combined with modern double glazing. You can compare energy efficiency by type and material, check current window energy ratings, and browse our double glazing windows range.
Aluminium Windows
Aluminium windows offer slimmer frames and a modern appearance.
They are commonly used in contemporary homes and extensions.
Typical supply price
£600 – £1,000
Typical installed price
£900 – £1,500
Timber Windows
Timber windows are often used in period properties or conservation areas.
They offer a traditional appearance but require more maintenance.
Typical supply price
£700 – £1,200
Typical installed price
£1,000 – £1,800
Window Replacement Cost Comparison
A simple element that improves engagement on pricing pages is a visual price scale. It helps readers quickly understand where different window types sit in terms of cost.
Large home improvement sites use this because it makes the page easier to scan and increases time on page.
You can place it just before or after the section explaining window materials.
Typical Replacement Window Price Scale (UK)
You can also present it visually like this in the article:
Get a More Accurate Window Price
Average prices are helpful, but every property is different. Our replacement window cost calculator allows you to estimate prices based on your own window sizes and quantities. Many homeowners use it to get a quick idea of costs before starting a renovation or replacement project.
Typical Replacement Window Prices by Size
Prices represent typical UK replacement window costs in 2026 for standard uPVC windows.
| Window Size (mm) | Typical Supply Price | Installed Price |
|---|---|---|
| 600 × 900 | £200 – £350 | £450 – £650 |
| 1000 × 1000 | £250 – £400 | £500 – £750 |
| 1200 × 1200 | £300 – £450 | £550 – £850 |
| 1500 × 1200 | £350 – £500 | £650 – £950 |
| 1800 × 1200 | £450 – £650 | £800 – £1,200 |
Supply Only vs Supply and Fit Window Costs
Many window suppliers offer both supply-only and supply-and-fit options.
The price difference can be significant.
Supply-only windows are commonly purchased by:
- builders
- property developers
- experienced DIY homeowners
Supply and fit is more convenient for homeowners who prefer a complete installation service.
| Option | Typical price difference |
|---|---|
| Supply only | lowest cost |
| Supply and fit | £250 – £450 installation per window |
You can compare more options in our windows buying guides and review broader replacement windows choices.
Window Installation Costs in the UK
Installation costs vary depending on the project.
Typical installation costs include:
Labour
£150 – £300 per window
Removal of old windows
£50 – £100
Waste disposal
£20 – £40
Scaffolding (if required)
£300 – £800
These costs vary depending on property height, access, and installation difficulty.
Regional Differences in Replacement Window Costs
Window installation prices can vary depending on location.
Labour costs tend to be higher in major cities.
Typical regional price differences:
London and South East
10 – 20 percent higher installation costs
Midlands and Northern England
slightly lower labour costs
Scotland and Wales
similar pricing to northern England
However, the cost of the window itself is usually consistent across the UK.
Cost to Replace Windows in a 3 Bedroom House
One of the most common questions homeowners ask is:
How much does it cost to replace windows in a 3 bedroom house?
Most three bedroom houses in the UK have 8 to 12 windows.
Typical replacement costs are:
| Window type | Estimated cost |
|---|---|
| uPVC casement windows | £4,000 – £7,000 |
| uPVC sliding sash windows | £6,000 – £10,000 |
| Aluminium windows | £8,000 – £14,000 |
| Timber windows | £9,000 – £16,000 |
These prices vary depending on window sizes, installation complexity, and optional upgrades.
What Affects the Cost of Replacement Windows?
Several factors influence the cost of replacing windows.
Window Size
Larger windows require more materials and larger glass units.
This increases both manufacturing and installation costs.
Glazing Specification
Standard double glazing is included in most replacement windows.
Optional upgrades include:
- triple glazing
- acoustic glass
- solar control coatings
These can increase the price. You can also compare window energy ratings and sound reducing windows.
Frame Colour
Standard white frames are usually the most affordable.
Coloured frames or woodgrain finishes may cost more.
Installation Complexity
Difficult installations can increase labour costs.
Examples include:
- structural openings
- restricted access
- scaffolding requirements
Are Replacement Windows Worth the Cost?
Replacing windows can provide several long-term benefits.
Modern windows can improve:
Energy efficiency
New windows reduce heat loss and improve insulation.
Comfort
Improved seals reduce draughts.
Noise reduction
Modern glazing reduces outside noise.
Property value
Well installed windows improve curb appeal and resale value.
You can also review energy efficiency by type and material, compare window energy ratings, explore sound reducing windows, and look at modern window security.
FAQ – Replacement Window Costs
Most replacement windows cost between £500 and £1,200 installed, depending on the material, size, and installation complexity.
Replacing windows in a typical three bedroom house usually costs £4,500 to £9,000 for uPVC windows depending on the number and size of windows.
Most windows last 20 to 30 years. If they are draughty, difficult to open, or poorly insulated, replacement may improve energy efficiency and comfort.
Standard uPVC windows typically cost £250 to £450 supply only, with installed prices around £500 to £800 per window.
Yes. Replacing several windows at the same time usually reduces installation costs because labour and equipment can be shared across the project.
Final Thoughts
The average cost of replacement windows in the UK in 2026 ranges from approximately £500 to £1,200 per window installed, depending on the materials, style, and installation complexity.
uPVC windows remain the most affordable option, while aluminium and timber frames provide alternative aesthetic and performance benefits.
Because every property is different, the most accurate way to estimate costs is to measure each window and obtain a detailed quote from a supplier or installer. You can start with the replacement window cost calculator.
Ready to Estimate Your Window Project?
If you are planning to replace windows in your home, our calculator can give you a quick estimate based on your requirements. Simply enter the number and type of windows to see a realistic price guide. You can also request a quote if you would like a more detailed estimate.
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