How Much Do New Windows Cost?
A transparent breakdown of 2026 window replacement costs — comparing uPVC and aluminium, and how material, style and access affect your final quote in Berkshire, Windsor and the Thames Valley.
Quick answer
A new uPVC window costs from about £500 supplied and fitted, and an aluminium window from about £950. A full house of 8–10 windows typically costs £5,500–£12,000 in uPVC or £11,000–£20,000 in aluminium, with London and the South East running roughly 10–20% above the national average.
Per square metre, uPVC windows work out at roughly £350–£600 and aluminium windows at roughly £650–£1,100, fitted (based on a typical 1.2m × 1.2m window). Aluminium sliding doors start from about £850 per m² plus VAT for the doors supplied. Have a period home? See our guide to windows for a 1930s semi-detached.
2026 Price Guide at a Glance
| What you’re replacing | uPVC | Aluminium |
|---|---|---|
| Single window, supplied & fitted | from £500 | from £950 |
| Full house (8–10 windows) | £5,500–£12,000 | £11,000–£20,000 |
| Sliding sash window | from £900 | — |
| Bay or bow window | £2,500–£4,500 | £3,500–£6,000 |
| Composite front door | from £1,400 | — |
Indicative 2026 prices including VAT and installation. Every quote is fixed after a free survey.
Get your fixed price
Book a free survey and we’ll give you a written, itemised quote — usually within 24 hours of the visit. Call 01753 965 005 or request a callback below. 0% and low-rate finance is available on larger projects, subject to status.
What Actually Drives the Price of New Windows
Two houses on the same street can get very different quotes. The price is driven by five things, roughly in order of impact — and where you are in the country matters too. Prices in London and the South East run roughly 10–20% above the national average.
Material and system
uPVC is the most cost-effective; aluminium costs more but gives slimmer frames and a longer life. Timber and heritage systems cost the most.
Number and size of windows
The per-window price falls as the job gets bigger, so a whole-house replacement is better value than doing one or two at a time.
Glass specification
Standard double glazing, high-performance low-E, acoustic, toughened or triple glazing all change the price.
Style and opening type
Fixed and casement windows are cheapest; sash, bay, bow and shaped windows cost more to make and fit.
Access and property type
Upper floors, scaffolding, conservation-area or listed-building requirements and difficult access all add cost.
Average Replacement Windows Cost in 2026
As of April 2026, the average cost for a single replacement window typically ranges between £500 and £1,500, including the window unit, professional installation, and VAT.
For a standard three-bedroom semi-detached home in Berkshire or the wider Thames Valley, a full house replacement (approx. 8–10 windows) generally ranges from £5,500 to £12,000 for uPVC, and £11,000 to £20,000 for high-specification aluminium systems.
Material Showdown: uPVC vs. Aluminium
uPVC Windows
- Exceptional thermal insulation and cost-effectiveness
- U-values as low as 1.0 W/m²K
- Virtually zero maintenance
- Anthracite Grey and Black woodgrain foils trending in 2026
Aluminium Windows
- Slim sightlines and larger glass spans
- Does not warp, rot, or rust — “fit and forget”
- Ideal for floor-to-ceiling glass and minimalist frames
- Multi-point locking for superior security
Style Variations: Impact on Budget
Casement Windows
The most common UK style — hinged at the side or top, straightforward hardware.
Lowest budget impactSash Windows
Essential for heritage properties in Windsor and Eton. Vertical sliding mechanism needs weights or spring balances.
30–50% premiumBay & Bow Windows
Multiple units joined at angles, requiring structural support and specialist “bay poles”.
£2,500–£4,500Technical Factors Influencing 2026 Prices
Glazing Type
Triple glazing typically adds 20–30% to unit cost, popular for noise pollution and heat loss.
U-Values & Energy Ratings
A++ rated windows use low-E glass and argon fills — a slight added cost for long-term savings.
Specialist Finishes
Custom RAL colours or dual-colour frames typically add 10–15% to manufacturing cost.
Security Upgrades
Laminated glass or PAS 24 hardware for ground-floor windows adds roughly £50–£100 per opening.
What a Full-House Replacement Looks Like
A common project for us is replacing 10 to 14 tired timber or early uPVC windows in a 1930s–1960s Thames Valley house. For a conservation area or period street, that usually means uPVC or aluminium sliding sash and flush casement frames, often with a wood-effect or heritage finish, chosen to match the original sightlines.
Work like this is typically fitted in three to five days, room by room, with the house kept weathertight throughout. A project of that size and specification generally lands somewhere between £9,000 and £16,000 including VAT and installation, though the only accurate figure is a fixed quote after survey.
Cost of new windows by house size
The quickest way to estimate your budget is to count your windows. These figures use our starting prices of about £500 per uPVC window and £950 per aluminium window, supplied and fitted, so treat them as the lower end. Larger, bespoke or specialist windows will add to the total.
| Property | Typical windows | uPVC | Aluminium |
|---|---|---|---|
| 2-bed flat or house | 5–7 | from about £2,500 | from about £4,750 |
| 3-bed semi or terrace | 8–10 | £5,500–£12,000 | £11,000–£20,000 |
| 4-bed detached | 11–14 | from about £5,500 | from about £10,500 |
Most three-bedroom homes we survey have 8 to 10 windows, which is why that row matches our full-house price range. Adding a bay window, a sash window or a new front door changes the total, so it is worth listing everything you want replaced before you ask for quotes.
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Get my free quoteor call 01753 965 005★★★★★ Rated 4.9 on Google · Free, no-obligation surveyHow much is window replacement per window?
A single standard window starts from about £500 in uPVC and £950 in aluminium, fitted. The price of each window then moves with five main things:
- Size: bigger frames need more material and heavier glass, and very large panes may need two fitters.
- Style: a simple casement costs less than a sliding sash (from £900) or a bay or bow window (£2,500–£6,000).
- Material: aluminium costs more than uPVC but offers slimmer frames and a longer lifespan. See our aluminium vs uPVC comparison.
- Glazing: triple glazing, acoustic or obscure glass all add to the cost. Read double vs triple glazing to see if it is worth it.
- Colour and finish: colours such as anthracite grey, or a different colour inside and out, usually cost more than standard white.
What a good window quote should include
Window prices are only comparable if the quotes cover the same things. Before you compare figures, check that each quote clearly states:
- The exact number, size and style of every window or door.
- The frame system and glazing specification, including energy rating or U-value.
- Whether removal and disposal of your old windows is included.
- Making good around the frames, inside and out.
- How the installation will be certified for Building Regulations.
- The guarantee on the frames, glass and installation.
A very low quote that leaves these out can end up costing more. We explain the common pitfalls in the hidden costs of cheap windows. Every quote we give is fixed and itemised after a free survey.
5 ways to reduce the cost of new windows
- Replace in phases: start with the windows in the worst condition, then do the rest later.
- Choose uPVC where it makes sense: use aluminium for the rooms where slim frames matter most, and uPVC elsewhere.
- Keep standard opening styles: casements are usually the most cost-effective choice.
- Do it all at once if you can: replacing several windows in one visit is more efficient than separate jobs.
- Spread the cost: we offer 0% finance options on qualifying installations.
Prices in London and the South East typically run 10 to 20 percent above the national average. For an accurate figure for your home in Windsor, Maidenhead or the wider Berkshire area, get a free, fixed quote.
Frequently asked questions
Can I get a quote online?
While we can provide rough estimates based on dimensions, we recommend a site survey. This allows us to assess structural integrity and access requirements.
How long does installation take?
A standard window installation for a whole house usually takes between 2 and 5 days. We ensure clean workmanship, disposing of all old frames and leaving your property weather-tight at the end of each day.
Are new windows worth the investment in 2026?
Yes. With energy prices remaining volatile, reducing heat loss through the building envelope is the most effective way to lower overheads. “Energy Class A” windows are now a significant selling point in the property market.
How much do new windows cost for a 3-bed house?
Most 3-bedroom homes have 8 to 10 windows. Replacing them typically costs £5,500 to £12,000 in uPVC or £11,000 to £20,000 in aluminium, supplied and fitted. Bay windows, sash windows and doors add to the total.
How much does it cost to replace one window?
A single standard window starts from about £500 in uPVC or £950 in aluminium, supplied and fitted. Size, style, glazing and colour all affect the final price.
Is it cheaper to replace all windows at once?
Usually yes. Replacing several windows in one visit is more efficient than separate jobs, although replacing in phases can help spread the cost.
Why do window quotes vary so much?
Quotes differ in frame system, glazing specification, guarantees and whether removal, making good and certification are included. Always compare like for like.
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Free guide
The Homeowner’s Guide to Windows & Doors (2026)
Aluminium vs uPVC in hotter summers, guide prices and 10 questions to ask installers.