How much do new windows or double glazing cost in the UK? (2026)
Verified UK costs for uPVC, aluminium and timber double glazing in 2026, per window and per house. Fitting labour, full-house pricing tiers, what's normally included, and the red flags to watch for in a window quote.
A new set of double glazed windows in the UK in 2026 costs between £400 for a single small casement and £30,000+ for a full-house premium aluminium or triple-glazed install. The mid-range, where most homeowners sit, is £4,800 to £9,600 for a full uPVC replacement on an average 3-bed home.
Quick answer
A full uPVC double glazing replacement on an average UK home in 2026 costs £4,800–£9,600 for a 3-bed (8–10 windows), £2,400–£4,800 for a 2-bed (5–7 windows), and £6,400–£12,000 for a 4-bed (10–14 windows). Per window: £400–£900 supplied and fitted. Fitting labour: £100–£200 per window. Aluminium adds 30–60% on top of uPVC; timber adds 60–120%.
How to read this guide#
Two kinds of figures appear below:
- Headline price ranges (per-window costs, full-house tiers, fitting day rate): cross-referenced against MyJobQuote's UK 2026 cost guides. Sources listed at the bottom of the page.
- Practical guidance (frame material trade-offs, FENSA implications, regional uplifts, quote red flags): drawn from standard UK fenestration industry practice. Useful for context and decision-making but not cross-referenced figure-by-figure.
Where we could not verify a specific number against published cost guides, we have either left it out or described the item qualitatively.
Headline ranges (verified)#
Full-house uPVC double glazing replacement, UK 2026:
| House size | Window count | Range |
|---|---|---|
| 2-bed | 5–7 | £2,400 – £4,800 |
| 3-bed | 8–10 | £4,800 – £9,600 |
| 4-bed | 10–14 | £6,400 – £12,000 |
| 5-bed+ | 14+ | £9,600 – £18,000+ |
Per-window pricing (supplied and fitted, uPVC):
| Style | Range |
|---|---|
| Standard casement | £400 – £900 |
| Sash window | £700 – £1,500 |
| Bay window | £1,500 – £3,500 |
| Tilt-and-turn | £550 – £1,200 |
| French casement | £900 – £1,800 |
Other verified figures:
- Fitting labour: £100–£200 per window
- Trickle vents (where added): £20–£40 per window
- Standard 28mm double glazed sealed unit (replacement only): £100–£200
Practical guidance (industry standard)#
Frame material: how the choice changes the price#
UK windows come in three main frame materials, each with a distinct cost and trade-off profile.
- uPVC is the volume choice, the cheapest, and what the headline ranges above describe. Lifespan is around 25–35 years with minimal maintenance. Colour options have expanded beyond white; foiled woodgrain and grey finishes are now standard at no extra cost on most ranges.
- Aluminium adds roughly 30–60 percent on top of uPVC. Thinner frames (more glass per opening), modern look, and longer lifespan (40+ years). Cold-bridging is solved with thermally broken frames; make sure the quote specifies this if you live in an exposed location.
- Timber (engineered or hardwood) adds 60–120 percent on top of uPVC. Almost always required in conservation areas and listed buildings. Needs re-painting or re-staining every 5–10 years, which is a real cost over the window's life.
Watch out for "aluminium-effect" uPVC — it is uPVC priced near uPVC but sold with the visual cue of aluminium. A genuine aluminium frame quote will specify the system (Origin, Aluk, Smart, Reynaers, Schüco) and the U-value.
What this price normally covers#
A complete double glazing quote in the UK should typically cover:
- The frames, sealed glass units, handles, hinges and trickle vents
- Removal and disposal of existing windows
- Fitting labour for the standard install duration
- A workmanship guarantee from the installer (usually 10 years, sometimes longer)
- The frame manufacturer's product warranty (typically 10 to 20 years)
- FENSA or CERTASS self-certification (Building Regulations compliance)
It often does not cover:
- Internal making-good (filler, paint touch-ups, plaster repair around the new frames)
- External rendering or pointing repairs disturbed during fitting
- Removing or refitting any internal blinds, shutters or curtain rails
- Trickle vents on quotes that pre-date the 2022 Part F change (any quote drafted before the change may need an update; vents are now mandatory on replacement units in most cases)
- Toughened or laminated safety glass to current Part Q spec where required (low-level, near doors, in bathrooms), usually included but worth confirming
When comparing quotes, the easy mistake is comparing a £6,000 quote that includes FENSA and disposal against a £5,200 quote that does not. Read the exclusions section before you compare totals.
Labour: how the fitting cost translates to a total#
Fitting labour of £100 to £200 per window is the verified figure. A two-person team typically installs 6 to 10 standard windows per day, which puts fitter-only labour for a 3-bed install (8 windows) at £800 to £1,600, usually 15 to 25 percent of the headline total.
If labour appears below £100 per window in the quote, it has often been folded into the per-frame price, hiding the cost rather than removing it. Ask for it broken out so you can compare on like-for-like terms.
Regional variation#
UK window prices vary by region, mainly on the labour side (frame materials are nationally priced). Standard UK adjustments:
- Inner London: ~15–25% above the national average
- Outer London / M25: ~10–20% above
- South-East: ~5–10% above
- Midlands and East: close to the national average
- North of England, Wales: ~5–10% below
- Northern Ireland, rural Scotland: ~8–12% below
Treat these as rough adjustments rather than precise multipliers; actual variation depends on the installer's location and how busy the local trade is.
Red flags in window quotes specifically#
Beyond the standard quote red flags (covered separately), some are specific to windows:
No mention of FENSA or CERTASS. Replacement windows are notifiable under Building Regulations Part L. Either the installer self-certifies via FENSA or CERTASS (included in the quote), or you pay separately for Building Control sign-off. A quote that ignores this is incomplete.
"Cash price" or pressure for same-day decisions. Window sales have a reputation for high-pressure tactics. A genuine quote is valid for at least 14 days. "Sign today for a 40% discount" is a negotiation play, not a real offer.
No glass spec or U-value listed. A real quote names the glass type (typically 28mm sealed unit, low-E coating, argon-filled) and the whole window U-value (1.2–1.4 W/m²K is current standard; 0.8 is Passivhaus territory). "Energy A-rated" alone is marketing copy, not a spec.
No window energy rating (WER) or no Part F trickle vents. If your quote is for 2022 onwards and does not specify trickle vents, the installer has either missed the regulation change or is planning to fit non-compliant units.
Frame manufacturer not named. "uPVC frames" without a system name (Rehau, Veka, Liniar, Deceuninck, Eurocell, Profile 22) makes it impossible to compare quotes. Ask for the manufacturer and the profile depth (70mm standard, 80mm+ improves U-value).
Lifetime guarantee that is not transferable. A 10-year guarantee that expires when you sell the house is worth less than a 10-year guarantee that transfers with the property. Read what the guarantee actually covers; most exclude glass discolouration, hinge wear and silicone seals.
Comparing your quote#
The reliable way to know if a window quote is fair is to compare each line against the ranges above. The easier way (and the reason this site exists) is to paste your quote into the quote checker and get every line analysed against current UK rates, scope-checked against what is typically missing, and the installer verified against Companies House.
The £14 cost is well below the level at which most homeowners would deliberate on a £6,000 window quote. The information you get back closes the gap between "this number looks roughly right" and "every line of this number checks out."
Got a quote you want checked?
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Frequently asked questions
- How much do new windows cost for a whole house in the UK in 2026?
- A full uPVC double glazing replacement for an average 3-bed UK house costs roughly £4,800 to £9,600, supplied and fitted (MyJobQuote, 2026). Smaller 2-bed homes start around £2,400 to £4,800; larger 4-bed houses run £6,400 to £12,000. Aluminium-frame windows add 30 to 60 percent on top; timber (sash or casement) adds 60 to 120 percent.
- How much does a single uPVC window cost supplied and fitted?
- A standard uPVC casement double glazed window costs £400 to £900 supplied and fitted in 2026, depending on size, glass spec and frame style (MyJobQuote, 2026). Sash-style uPVC windows run £700 to £1,500 each. Bay windows (which combine three or more units into one frame) typically cost £1,500 to £3,500 each.
- How much is fitting labour per window?
- Window fitting labour is £100 to £200 per window for a straightforward replacement (MyJobQuote, 2026). A two-person fitter team can typically install 6 to 10 standard windows per day. Quotes that show fitting as more than 30 percent of the headline total usually indicate either structural complications (new openings, lintels needed) or that materials have been quoted at trade price.
- What is not usually included in a window quote?
- Common scope gaps in UK window quotes: internal making-good after the fitter has left (filler, paint, plaster repair around new frames), trickle vents if not specified, FENSA or CERTASS certificate (most reputable installers include this; confirm in writing), security locks and child restrictors above standard spec, structural work for new openings (lintels, sills, brickwork), removal and disposal of old frames if you have many to dispose of, and any internal blinds or shutters disturbed during install.
- Should I get FENSA or CERTASS-registered installers?
- Yes. FENSA or CERTASS registration means the installer self-certifies their work meets Building Regulations Part L (energy efficiency) and Part Q (security), and you receive a certificate you must show when you sell the house. Without one, you need a Building Control sign-off paid separately, typically £200 to £400 per project. A quote from an unregistered installer that does not mention how Building Control will be satisfied is incomplete.
- How much deposit should I pay?
- No more than 10 to 25 percent of the contract value. Window manufacturers usually require a deposit to start building bespoke frames, so some upfront payment is normal. The balance should be staged: a payment when the frames arrive on site and the final payment on completion (FENSA/CERTASS certificate issued, snagging done). Pay the deposit by credit card if the value is between £100 and £30,000. Section 75 of the Consumer Credit Act gives you protection if the installer fails to deliver.
- Does triple glazing make sense in the UK?
- Triple glazing costs roughly 30 to 50 percent more than equivalent double glazing in the UK in 2026. The payback in energy savings alone is long (often 15+ years) because UK heating bills are not the dominant factor that justifies triple glazing in colder European climates. The case for triple glazing in the UK is usually about noise reduction (next to a busy road or under a flight path) or a Passivhaus-standard renovation, not energy savings.
- How long does a whole-house window replacement take?
- A standard 3-bed uPVC replacement takes 1 to 2 days on site for fitting, with each window typically replaced in 30 to 90 minutes including making-good. Add 4 to 8 weeks of lead time before fitting for frame manufacture (longer for aluminium and timber). Bespoke shapes, conservation areas, or sash windows can extend the lead time to 10 to 12 weeks.
Last updated: 20 May 2026
Sources cross-referenced: