uPVC Windows Cost: Don’t Pay Too Much (2026 Price Check)

A standard uPVC windows cost of a double-glazed casement window is £500–£800 fully installed in the UK. Small casements start from £400, large casements run £600–£800, and large multi-section windows cost £950–£1,300+. Style, size, glazing spec, and colour all move that figure inside these bands; the breakdown below shows exactly where your quote should land.

If you’ve got a quote in hand and want to check it’s fair, start with the size-and-style match in the table below. If your window isn’t a close match to any row, the gap is usually explained by one of the specific cost factors further down, not a random markup.

Based on Flush Sash UPVC’s experience fitting windows across Buckinghamshire and the Home Counties, the single most common first-quote question we hear isn’t “is this the cheapest price”; it’s “how do I know this figure is genuine?” The table below is built to answer that directly.

How Much Do uPVC Windows Cost? Quick Overview

Window style	Typical size	Supply only	Supply & fitted
Small casement	600 × 900mm	£180–£280	£400–£550
Standard casement	900 × 1200mm	£250–£375	£500–£700
Large casement	1200 × 1200mm	£325–£475	£600–£800
Large 3-section window	1800 × 1200mm	£450–£650	£750–£1,050
Large 4-section window	2400 × 1200mm	£600–£850	£950–£1,300

The gap between supply-only and fitted for a standard casement is roughly £225–£325; that’s your labour, removal, and making-good cost. If a “fully fitted” quote you’ve received is close to the supply-only figures above, ask what’s actually included before assuming it’s the cheaper deal.

uPVC Windows Cost by Style

uPVC Casement Window Cost

£500–£800 fitted for standard and large sizes, £400–£550 for small casements, £750–£1,300 for multi-section versions, see the full table above. This is the baseline every other style is priced against below.

uPVC Sash Windows Cost

Sliding sash windows typically run around 50% more than an equivalent casement, which puts a standard-size sash at roughly £750–£1,200 fitted rather than £500–£800. The balance mechanism and box-frame construction account for the difference, not the glazing itself.

uPVC Tilt and Turn Window Cost

Tilt and turn windows typically cost around 25% more than an equivalent casement, roughly £625–£1,000 fitted against £500–£800 for a standard casement. The premium comes from the dual-opening hardware: tilt for secure ventilation, turn for full opening and cleaning access.

uPVC Bay Window Cost

A 3-panel bay built from casement-equivalent sections starts from around £750–£1,050 in glazing terms, the same bracket as the large 3-section window above, before the additional structural support work most bay installations need is added on top. That structural element is the part a simple per-window calculation misses, and it’s the main reason bay quotes vary more than any other style.

uPVC Bow Window Cost

Bow windows, typically built from four or more curved panels, sit closer to the large 4-section bracket, around £950–£1,300 in glazing terms, again before structural support is added. The curved frame sections also tend to be more bespoke to manufacture than a bay’s flat angled panels, which can add further to the total.

uPVC Flush Casement Window Cost

Flush sash windows cost £650–£1,000+ fitted, against £500–£800 for a standard casement of the same size, roughly a 25–30% premium. That pays for the precision needed to sit the sash flush with the frame rather than proud of it. On a very narrow Victorian bay front specifically, a standard casement can sometimes preserve better sightlines than forcing a flush sash profile into a tight opening, worth raising at survey stage if that’s your property type.

uPVC Fixed Window Cost

A fixed, non-opening window in the same size bracket as a standard casement typically prices below the £500–£700 fitted range, since there’s no hinge, handle, or multi-point locking hardware to manufacture and fit. The size-based figures in the main table are still the right starting point, just expect the fitted price to land at or under the bottom of the relevant band.

What Affects uPVC Windows Cost?

Window Size and Dimensions

This is the single biggest driver in the table above: moving from a small 600 × 900mm casement to a large 4-section 2400 × 1200mm window roughly triples the fitted price, from £400–£550 to £950–£1,300.

Glazing Specification (Double vs. Triple Glazing)

Triple glazing adds roughly 10–20% on top of the double-glazed prices above. On a standard casement, that’s an extra £50–£160 depending on where in the £500–£800 band you start.

Frame Colour and Finish

White uPVC is the base price in every figure above. Colour externally with white internally adds roughly 10–15%; colour on both sides adds roughly 15–25%. On a standard casement, that’s an extra £50–£100 for single-side colour, or £75–£175 for colour both sides.

Number of Opening Sections

Each additional opening sash adds its own hinges, handle, and locking point; hardware cost that scales with sections, independent of the window’s overall size. This is why a large 3-section window (£750–£1,050) costs more than a large casement of similar total glazed area with fewer opening parts.

Number of Windows Ordered

Ordering multiple windows together spreads delivery and labour across the job, which is why whole-house pricing (below) works out lower per window than pricing single replacements individually.

Access and Installation Complexity

Difficult access, no driveway for a delivery vehicle, narrow side passage, or upper-floor windows needing scaffolding, adds labour cost on top of the fitted prices above. Removal and disposal of your existing windows is included in “fitted” pricing but is worth confirming explicitly, since it’s the line item most often left off a cut-price quote.

uPVC Windows Cost: Supply-Only vs. Fully Fitted

What’s Included in a Supply-Only Price

The left-hand column of the main table: the manufactured window only, ranging from £180–£280 for a small casement to £600–£850 for a large 4-section unit. No fitting, removal, or making good.

What’s Included in a Fully Fitted Price

The right-hand column: window plus installation, removal of the old unit, and basic making good, £400–£550 up to £950–£1,300 across the same size range. The roughly £225–£325 gap per standard casement between the two columns is your labour and disposal cost, a useful number to check a “fitted” quote against.

Glass Type and Its Impact on uPVC Windows Cost

Double Glazing vs. Triple Glazing

Double glazing is the specification behind every price in the main table. Triple glazing adds roughly 10–20% on top, for a standard casement, which moves the fitted price from £500–£800 to roughly £550–£960.

Low-E, Toughened, Laminated and Acoustic Glass

Low-E coatings and argon fill are usually bundled into the double or triple-glazed unit rather than priced as standalone extras. Toughened or laminated glass is required by regulation near floor level regardless of budget; it’s a safety specification, not an optional upgrade, so don’t expect it to be negotiable on price. 

If your home faces a busy road, ask specifically about acoustic glass at survey stage, not just triple glazing, since noise reduction and thermal upgrade are two different specs that get conflated more often than they should.

Argon Gas Fill and U-Values

Argon gas fill lowers a window’s U-value, the figure describing heat loss, compared with an ordinary air-filled unit. It’s typically included as standard in the double and triple-glazed pricing above rather than charged as a separate line.

Do uPVC Windows Help Save Energy During Winter?

Yes. uPVC windows can reduce heat loss by up to 30% compared with single glazing, largely down to the insulating air or gas gap between panes and the frame material itself, which doesn’t conduct heat the way metal does.

How uPVC Windows Help Reduce Energy Costs in Winter

Reduced heat loss lowers the amount of heating needed to maintain the same indoor temperature, which is where the winter energy saving comes from. Trickle vents allow background ventilation without opening the window and losing that retained heat, a detail that matters more in winter than most guides mention.

Winter uPVC Window Energy Cost vs. Single Glazing

The up-to-30% heat loss reduction against single glazing is the clearest, most consistent figure available here; it’s a fabric-level improvement, not dependent on your specific heating system, which is why it holds across most UK property types.

U-Values and Winter Heat Retention Explained

A U-value measures heat loss through a window; a lower value means better retention. Argon-filled, Low-E double glazing achieves a meaningfully lower U-value than a basic air-filled double-glazed unit of the same size, which is the practical reason two visually similar windows can perform very differently through winter.

uPVC Windows Cost for a Full House

Property	Approx. windows	Typical installed cost
1-bed flat	4–5	£2,500–£4,000
2-bed house	6–8	£3,500–£5,500
3-bed house	8–12	£5,000–£8,000
4-bed house	12–15	£7,000–£10,000
Larger 4/5-bed house	15–20+	£9,000–£14,000+

Cost for a Small Home (5–6 Windows)

£2,500–£4,500, sitting across the 1-bed flat figure and the lower end of the 2-bed house bracket above.

Cost for a Medium Home (8–10 Windows)

£4,500–£8,000, spanning the top of the 2-bed bracket through the 3-bed house figure.

Cost for a Large Home (12+ Windows)

£7,000–£14,000+, covering the 4-bed and larger 4/5-bed house figures, with the top end driven by window count and any bay or bow features. If a full house of windows is part of a wider renovation, it’s often worth pricing your bifold doors alongside them; ordering both together tends to bring the same access and labour efficiencies as ordering windows in bulk.

If any of these brackets sound close to your project, the fastest way to move from a range to an exact figure is a survey; you can check current availability via Contact Us without committing to anything.

A Real Buckinghamshire Example

A homeowner replacing 8 windows on a 1930s semi near Aylesbury sits squarely in the £5,000–£8,000 bracket above, assuming a standard casement mix with no bay or coloured finish. 

A comparable 8-window job on a Victorian terrace closer to Oxford city centre, with one bay window and a conservation-area colour requirement, would land toward the top of that bracket or above it; the bay alone can add several hundred pounds once structural support is included, and colour restrictions in a conservation area often mean paying the externally-coloured premium whether or not you’d have chosen it otherwise.

If your property is in a conservation area, check with your local planning department before ordering a coloured frame; it’s the single most common reason an otherwise straightforward quote ends up needing revisiting.

That gap between two “8-window” jobs is exactly why the whole-house figures above are a starting range, not a fixed price, and why a specific quote from a survey, rather than a table, is what actually protects you from a surprise on installation day.

How to Measure for uPVC Windows

Measure the width and height of the opening at three points each, top, middle, and bottom. Use the smallest of the three measurements for each dimension, since older openings are rarely perfectly square and an oversized measurement risks a window that doesn’t fit.

Building Regulations and FENSA Compliance

Window replacement is notifiable work under Building Regulations Part L. A FENSA-registered installer can self-certify the work directly, which avoids a separate building control inspection and its own timeline. You can check what the scheme covers via FENSA, the official UK competent person scheme for window and door installation.

If your property is listed or in a conservation area, standard FENSA-covered work may not apply, and Listed Building Consent can be required instead, particularly for frame colour on street-facing elevations. Check with your local planning department directly before ordering a coloured finish on a listed or conservation-area property.

How to Get the Best uPVC Windows Cost

Comparing Supply-Only and Installer Quotes

Match the column, not just the number: a £600 supply-only quote and a £600 fully fitted quote for the same window are not comparable, even though the figure looks identical. Use the £225–£325 typical labour gap above as your check.

Ordering Windows in Bulk vs. Individually

Whole-house pricing above works out lower per window than the single-unit table at the top — for example, a 3-bed house at £5,000–£8,000 for 8–12 windows averages roughly £415–£1,000 per window, inside or below the single-unit casement bracket, depending on the mix of styles ordered.

Are Flush Sash Windows More Expensive Than Standard uPVC Windows?

Yes, £650–£1,000+ fitted for flush sash against £500–£800 for standard casement, a roughly 25–30% premium. That’s the manufacturing precision of a flush fit, not an arbitrary markup. For a period property where sightlines matter, that premium is often worth it; for a straightforward new-build estate window, standard casement typically does the job for less.

Get Your Casement Window Estimates

Our team is based in Buckinghamshire and Oxfordshire, manufacturing every window in-house and backing it with a 10-year guarantee. Head to Contact Us to book your survey.