COST GUIDES
New windows cost guide and calculator: UK pricing averages
Updated 06/26
Average cost for a 3-bed house
Around £7,500 (based on 12 uPVC casement windows)
Typical window prices
From £350–£520 per window for basic uPVC, rising to £1,300 for composite windows, depending on specification
Certification required
Installers must provide FENSA or Certass certification for building regulations compliance
New windows are a long-term investment that can improve your home's insulation, security, and kerb appeal.
However, the cost of new windows is affected by style, frame material, glazing, and installation requirements, so it's key to understand all the variables before you get started.
This guide explains how much new windows cost in the UK, what affects pricing, and how to use our window cost calculator to plan your budget before requesting quotes.
Window prices vary significantly by material and glazing — always compare like-for-like quotes and check whether installation, scaffolding, and making good are included.
Average new window costs
3-bed house: averages around £7,500 (based on 12 uPVC casement windows)
Basic uPVC casement windows typically range from £350–£520 per window
A composite bay window might cost up to around £3,000
Larger homes or premium materials (timber, aluminium, composite), plus triple glazing, scaffolding, or lintel work can increase costs.
For an accurate quote, a certified installer will assess your property and provide a detailed breakdown.
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What affects new window costs?
The cost of new windows depends on several key factors:
Window style: casement, sash, tilt and turn, bay
Frame material: uPVC, timber, aluminium, composite, steel
Type of glazing: double, triple, or specialist
Number of windows
Installation complexity: scaffolding, access, lintels
Certification requirements: FENSA or Certass compliance
These factors help to explain why two similar homes can receive very different quotes.
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New window costs by style
Casement windows
Hinged at the side or top, casement windows are the most common and cost-effective window style in the UK.
Typical cost: £350–£520 per window (depending on the size and material)
Average cost of new windows in a 3-bed house: £7,500 (around 12 windows)
| Cost provided item | Unit | Range - Low +VAT | Range - High +VAT | Average cost +VAT |
|---|---|---|---|---|
| Flush casement windows prices | (Window and installation) 600 x 900 mm | £300 | £400 | £350 |
| Flush casement windows prices | (Window and installation) 1,200 x 1,200 | £450 | £550 | £500 |
| Flush casement windows prices | 940 x 1600 mm | £470 | £570 | £520 |
| Full house uPVC casement | 3 bedroom, 12 windows | £5,000 | £10,000 | £7,500 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
Sash windows
Often found in period properties, sash windows require more maintenance, and are typically 50% more expensive than casement windows.
£520–£625 for white uPVC sash windows (500x500mm)
£600-£720 for white uPVC sash windows (1,000x500mm)
£625-£720 for wood effect uPVC sash windows (500x500mm)
£700-£800 for wood effect uPVC sash windows (1,000x500mm)
| Type of repair/replacement | Cost + VAT (Range low - high) | Average cost |
|---|---|---|
| Cost of replacing a sash window | £1,300 | |
| Cost of replacing a sash window with double glazing | £1,300 | |
| Sash window restoration cost | £80 - £488 | £284 |
| Sash window cord repair cost (replacement) | £120 - £160 | £140 |
| Cost of draught proofing sash windows | £200 - £400 | £300 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Tilt and Turn windows
Known for ventilation and security, tilt and turn windows open inwards while remaining locked. They are usually around 25% more expensive than casement windows.
UPVC Tilt and Turn windows range from around £490 to £695 (depending on size and specifications)
| uPVC tilt and turn windows | Average price | Average fitting cost | Average total cost |
|---|---|---|---|
| 800 x 800 mm | £210 - £820 | £150 - £200 | £490 |
| 1,000 x 800 mm | £250 - £875 | £175 - £250 | £520 |
| 1,000 x 1,000 mm | £280 - £895 | £200 - £275 | £645 |
| 1,200 x 1,200 mm | £300 - £930 | £240 - £300 | £695 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
In comparison, woodgrain effect Tilt and Turn windows typically range from £580 to £810.
| Woodgrain tilt and turn windows | Average price | Average fitting cost | Average total cost |
|---|---|---|---|
| 800 x 800 mm | £300 - £1,230 | £150 - £200 | £580 |
| 1,000 x 800 mm | £360 - £1,320 | £175 - £250 | £650 |
| 1,000 x 1,000 mm | £410 - £670 | £200 - £275 | £720 |
| 1,200 x 1,200 mm | £450 - £1,400 | £240 - £300 | £810 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
Bay windows
With windows at the front and side, bay windows create a feature, add space, and boost kerb appeal, but often cost up to twice as much as casement windows.
Replacing a bay window typically costs around £2,000
New bay or box windows cost in the region of £1,250–£2,150
| Item | Range - Low | Range - High | Average cost |
|---|---|---|---|
| Average cost to replace a bay window | - | - | £2,000 |
| Bay windows | |||
| 3-sections | £1,000 | £1,400 | £1,250 |
| 4-sections | £1,500 | £1,800 | £1,650 |
| 5-sections | £1,900 | £2,400 | £2,150 |
| Bow windows | |||
| 3-sections | £1,100 | £1,400 | £1,250 |
| 4-sections | £1,500 | £1,800 | £1,650 |
| 5-sections | £1,900 | £2,300 | £2,100 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
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New window costs by frame material
The material used for the window frames also plays a major role in the overall cost of new windows.
uPVC windows
UPVC windows are the most affordable and low-maintenance option, while offering good thermal efficiency.
Casement windows: £500–£1,250 per window
Sash windows: £700–£1,500 per window
Tilt and turn windows: £600–£1,400 per window
Bay windows: £1,100–£4,000 per window
| Type of sash window | Size of window | Average cost |
|---|---|---|
| White uPVC sash window | 500mm x 500mm | £520–£625 |
| White uPVC sash window | 1000mm x 500mm | £600-£720 |
| Wood effect uPVC sash window | 500mm x 500mm | £625-£720 |
| Wood effect uPVC sash window | 1000mm x 500mm | £700-£800 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Coloured uPVC windows
Coloured uPVC windows are becoming increasingly popular with UK homeowners looking for a more contemporary look. However, they do typically come in more expensive than the standard white option.
| Cost provided item | Unit | Range - Low | Range - High | Average cost |
|---|---|---|---|---|
| Grey uPVC casement window (single opener sash) | 1000mm x 500mm | £325 | £375 | £350 |
| Grey uPVC French casement window | 1000mm x 50mm | £475 | £525 | £500 |
| Grey uPVC sliding sash window | 1000mm x 500mm | £700 | £800 | £750 |
| Grey uPVC tilt & turn window | 1000mm x 800mm | £550 | £600 | £575 |
| Install uPVC window frame | Per frame | - | - | £80 |
| Install glass | per pane | - | - | £27.50 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
Composite windows
Composite windows are made from a combination of materials that offer increased strength, durability, and energy efficiency.
Expect to pay in the region of £1,300 for a composite casement window
A composite bay window might cost up to around £3,000
| Item | Unit | Low-High | Average |
|---|---|---|---|
| Window Type | |||
| Composite Bay Window | Each | £2,000 - £3,500 | £3,000 |
| Composite Tilt & turn Window | Each | £1,100 - £1,600 | £1,400 |
| Composite Casement Window | Each | £1,000 - £1,500 | £1,300 |
| Composite Sash Window | Each | £1,500 - £2,000 | £1,800 |
| Frame Material | |||
| Timber-aluminium (aluclad) framed window | Each | £1,200 - £3,000 | £1,800 |
| uPVC-aluminium framed window | Each | £1,000 - £2,500 | £1,500 |
| Fibreglass framed window | Each | £1,500 - £3,500 | £2,500 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
Aluminium windows
Aluminium windows are durable and sleek, but they come with a more expensive price tag. Expect to pay at least 25% more for aluminium vs uPVC windows.
Aluminium windows cost: £475
Aluminium sliding windows cost: £665
| Type of window | Cost + VAT (Range low - high) | Average cost |
|---|---|---|
| Cost of aluminium windows | £350–£600 | £475 |
| Cost of uPVC windows | £250–£400 | £325 |
| Cost of aluminium sliding windows | £340–£990 | £665 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Steel windows
Steel windows have become synonymous with Crittal windows, known for their slim, contemporary aesthetic. They're strong, secure, and versatile.
Steel casement windows cost around £1,200
Steel bay windows cost in the region of £2,500 each
| Window type | Unit | Low-High | Average |
|---|---|---|---|
| Steel Bay Window | Each | £2,000 - £3,000 | £2,500 |
| Steel Tilt & turn Window | Each | £1,100 - £1,500 | £1,300 |
| Steel Casement Window | Each | £1,000 - £1,400 | £1,200 |
| Steel Sash Window | Each | £1,500 - £2,000 | £1,800 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
Timber windows
Wooden window frames add a beautiful, natural look to your home, but expect to pay at least 50% more for wood vs uPVC windows and commit to ongoing maintenance.
The supply and install of a timber casement window (600x900mm) normally sits around £925
For large timber sash windows (1,200x1,200mm), expect to pay around £1,650
| Window type and size | Unit | Price - low | Price - high | Average price |
|---|---|---|---|---|
| Timber casement window 600 x 900 mm | Window and installation | £850 | £1,000 | £925 |
| Timber casement window 1,200 x 1,200 mm | Window and installation | £900 | £1,500 | £1,200 |
| Timber sash window 600 x 900 mm | Window and installation | £1,400 | £1,580 | £1,490 |
| Timber sash window 1,200 x 1,200 mm | Window and installation | £1,500 | £1,800 | £1,650 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
Remember, quoted prices are ballpark figures to act as a guide. For an accurate quote for your project, contact a checked window installer.
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How glazing affects new window prices
Finally, the type of glazing you choose will influence the price you are quoted for your new windows. Depending on your requirements in terms of thermal efficiency, soundproofing, and looks, you have several options.
Double glazing
Double glazing is the standard choice for UK homes, offering strong thermal performance at a moderate cost. However, the cost of double glazing can vary quite extensively.
| Type of window | Range - Low | Range - High | Average cost |
|---|---|---|---|
| Casement windows | £500 | £1,250 | £1,000 |
| Sash windows | £700 | £1,500 | £1,200 |
| Sliding windows | £600 | £1,400 | £1,100 |
| Tilt and turn windows | £600 | £1,400 | £1,100 |
| Bay windows | £1,100 | £4,000 | £2,500 |
| Bow windows | £1,500 | £5,000+ | £3,000 |
| Last updated: May 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |||
Triple glazing
Triple glazing has a higher upfront cost, improved insulation, and better energy efficiency in exposed properties.
| Triple glazing project | Unit | Average cost (incl. installation and VAT) |
|---|---|---|
| Two-bedroom flat | 4 windows | £4,800 |
| Two bedroom terrace | 5 windows | £6,000 |
| Semi-detached house | 8 windows | £9,600 |
| Detached house | 12 glazed windows | £14,400 |
| Triple glazing | 1 window | £1,200 |
| Triple glazing | Per m2 | £1,200 |
| Last updated: May 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Specialist glazing
Specialist glazing options include soundproof glass, secondary glazing, and self-cleaning glass.
Soundproof windows
| Cost provided item | Unit | Average cost |
|---|---|---|
| Soundproof sash windows | 900mm x 500mm | £1,365 |
| 1,800mm x 1,250mm | £2,230 | |
| 1,225mm x 2,480mm | £4,760 | |
| Soundproof casement windows | 1,100mm x 900mm | £895 |
| 1,350mm x 1,200mm | £1,600 | |
| 1,400mm x 2,100mm | £1,860 | |
| Secondary glazing | Per window | £400 |
| Window fitters (team of two) | Per day | £300 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Self-cleaning glass
| Item | Standard Cost £ |
|---|---|
| Double glazed self clean, Activ (Clear) sealed unit, outer glass and inner glass 4mm. cavity width 4mm 1200mm x 1200mm | £181 |
| 1000×1500 triple glazed self cleaning glass skylight with timber kerb | £700 |
| Standard double window labour fitting | £300 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | |
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Additional costs to budget for
When planning your window replacement, it’s important to ensure all costs are included in your initial quote to avoid surprises further down the line.
Before accepting a quote, check for:
Installation labour: average cost, around £600 a day for two installers
Scaffolding: typically £1,000 a week (if required)
Waste removal: may involve skip hire £125–£320 per week (depending on size)
Making good: plastering or timber repairs around the new window installation. Expect to pay between £35–£40 per hour
Certification: FENSA or Certass certificates are a legal requirement
Make sure your window fitter is registered with a competent person scheme such as FENSA or Certass. Certification proves your new windows have been installed in line with building regulations; it is a legal requirement and essential for selling your home.
Window replacement timelines
Single window replacement: typically 1–2 hours per window, assuming standard access and no structural work
Whole house window replacement: usually 1–3 days for an average 3-bed home (around 10–12 windows)
Larger or complex installations: may take longer where scaffolding, bay windows, lintel work, or multiple storeys are involved
Making good and finishing: allow extra time for plaster repairs, trims, or external finishing, which may be completed on a separate visit
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New windows cost calculator
Already have an idea of what you want? Use our new windows cost calculator to:
Help set a realistic budget
Reduce unexpected project costs later
Make installer conversations more productive
Compare quotes fairly
Job Estimate Calculator
This calculator provides a guide price, not a quote. Your final cost will depend on access, window sizes, structural work, and compliance requirements. For confirmed pricing, installers will need to assess your property.
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New windows cost checklist
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New windows cost FAQs
What’s the average cost of new windows in a 3-bed house?
The average cost of new windows for a 3-bedroom house in the UK is around £7,500, based on installing approximately 12 uPVC casement windows.
Costs can be higher if you choose premium frame materials, specialist glazing, or need scaffolding or structural work.
How much does it cost to replace one window in the UK?
Replacing a single window typically costs from £350–£520 for a basic uPVC window, including installation.
Timber, aluminium, or composite windows will cost more. Prices depend on size, glazing, and specification.
What is the cheapest type of window to install?
uPVC casement windows are usually the cheapest option. They offer good thermal efficiency, low maintenance, and the lowest supply-and-fit costs compared to timber, aluminium, or composite alternatives.
Are triple glazed windows worth the extra cost?
Triple glazing costs more upfront than double glazing but can be worth it for:
Exposed or colder locations
Improved thermal efficiency
Reduced noise
For many UK homes, high-quality double glazing offers the best balance of cost and performance, but triple glazing may suit specific needs.
Does window replacement include installation and certification?
Most quotes include window supply, installation, and labour, but you should always check.
Installers must also provide FENSA or Certass certification, which proves the work complies with building regulations and is essential if you sell your home.
Do I need planning permission to replace windows?
Planning permission is not usually needed to replace windows, with the exception of listed buildings or properties in conservation areas. Always check with your local authority if you're unsure.
Can I replace windows myself to save money?
Window replacement is not a good idea as a DIY job. Incorrect installation can lead to:
Heat loss and draughts
Water ingress
Failed building regulations compliance
Using a certified installer ensures correct fitting, warranty protection, and legal certification.
Do new windows increase house value?
New windows can improve:
Kerb appeal
Buyer confidence
While they may not add direct value pound-for-pound, they can make a property easier to sell and help avoid price reductions during negotiations.
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