Last updated 22 April 2026
Cost of New Windows in
London — Q2 2026
Window prices by frame type
Fitted prices for a typical London installation as of Q2 2026, including VAT, frame, glazing, fitting, disposal of old frames, and FENSA self-certification. All figures per window. These are real ranges we quote every week, not national-chain showroom prices.
| Window type | System | Low | High |
|---|---|---|---|
| uPVC | |||
| Casement window | Deceuninck 2500 | £550 | £1,200 |
| Flush casement | Deceuninck Heritage | £650 | £1,400 |
| Tilt & turn | Deceuninck T&T | £700 | £1,500 |
| French casement | Deceuninck 2500 | £750 | £1,600 |
| Bay / bow window | Deceuninck 2500 | £1,800 | £4,500 |
| Sliding sash | Liniar Sash | £900 | £1,800 |
| Heritage (period profile) | Deceuninck Heritage | £800 | £1,700 |
| Aluminium | |||
| Casement window | APX / Smart Alitherm | £900 | £1,800 |
| Flush casement | APX Flush | £1,100 | £2,000 |
| Tilt & turn | APX70 / Schüco AWS 75 | £1,100 | £2,200 |
| Picture (fixed) window | APX Picture | £1,200 | £2,500 |
| Schüco AWS 70 | Schüco AWS 70.HI | £1,400 | £2,400 |
| Corner (structural) window | APX Corner | £2,500 | £6,000 |
| Heritage / Steel-look | |||
| Heritage aluminium | Smart Aluspace | £1,400 | £3,000+ |
| Heritage internal screen | Smart Aluspace internal | £1,200 | £2,600 |
Door prices — bifold & sliding
Bifold and sliding door prices in London, Q2 2026. Based on aluminium systems; uPVC sliding doors sit ~25% below the low end. Costs include frame, glazing, track, locks, and fitting — excluding structural opening works.
| Door type | Size | Low | High |
|---|---|---|---|
| Bifold doors | |||
| 3-pane bifold | up to 3m | £3,500 | £7,000 |
| 4-pane bifold | up to 4m | £4,500 | £8,500 |
| 5-pane bifold | up to 5m | £5,500 | £10,000 |
| XFOLD120 premium | 3m 3-pane | £6,500 | £9,000 |
| Schüco FD 75/90 | 3m 3-pane | £8,000 | £13,000 |
| Sliding / patio doors | |||
| 2-pane slider | up to 4m | £4,000 | £8,500 |
| 3-pane slider | up to 6m | £6,000 | £12,000 |
| APX20 Plus (25mm interlock) | up to 4m | £7,500 | £15,000 |
| Cortizo Vision (20mm interlock) | up to 3m | £6,500 | £11,000 |
| Schüco ASE motorised | up to 3.5m | £12,000 | £22,000 |
Whole-house replacement costs
Typical fitted costs for full London property replacements in 2026, based on average window counts and sizes we see weekly on the ground.
| Property | Windows | uPVC | Aluminium |
|---|---|---|---|
| 1-bed flat | 4–5 | £3,000–£5,500 | £4,500–£9,000 |
| 2-bed terrace | 6–8 | £4,500–£8,500 | £6,500–£14,000 |
| 3-bed semi | 10–12 | £7,000–£14,000 | £12,000–£25,000 |
| 4-bed detached | 14–18 | £10,000–£20,000 | £17,000–£35,000 |
| Period / conservation area | varies | +10–25% | +10–25% |
What drives the price
Five variables do 90% of the work on the final quote. If you're comparing three quotes, make sure they're specifying the same values across these five — otherwise you're comparing apples and pears.
1. Frame material +50–80%
Aluminium costs 50-80% more than equivalent uPVC. The premium buys slimmer sightlines, stronger frames for large spans, and a 30-40+ year lifespan vs uPVC's 25-30.
2. Glazing spec +15–30%
Triple glazing adds 15-25% vs double. Acoustic laminated glass adds 20-30%. Solar-control coatings and privacy obscure glass add 5-15%. Standard spec: 1.2 W/m²K U-value double glazing with Argon fill.
3. Colour and finish +10–20%
Standard white uPVC is baseline. RAL powder-coat aluminium or dual-colour uPVC (different inside/outside) adds 10-20%. Woodgrain foils (Golden Oak, Irish Oak, Chartwell Green) add 8-15%.
4. Size and shape +30–50%
Bay and bow windows cost 30-50% more than a flat equivalent due to structural posts and angle cuts. Arched, trapezoidal, or circular shapes carry a fabrication premium of 25-40%.
5. Fitting complexity +£500–£2,000
Scaffolding for 2nd-floor-plus windows adds £500-£1,500. Lintel replacement, brickwork repairs, or cill replacement each add £300-£1,000. Listed building work adds survey time (£400-£800) and heritage-approved profiles.
6. Conservation area +10–25%
Bedford Park, Strawberry Hill, Richmond Green and other conservation areas with Article 4 directions require heritage-compliant profiles and typically planning permission (£240+). Plan for 10-25% premium and 4-8 week extra lead time for approval.
Price compared to national firms
National installers (Anglian, Everest, Safestyle, SEHBAC) typically quote 2-3x higher than regional FENSA installers like us for the same product. This is driven by three things: in-house salesforce commission (typically 10-20% of ticket), showroom and advertising overheads (15-25%), and finance-margin structures on interest-bearing plans.
| Product | Local FENSA installer | National firm typical | Premium |
|---|---|---|---|
| uPVC casement (single) | £550–£1,200 | £1,500–£3,000 | 2.5x |
| Aluminium casement (single) | £900–£1,800 | £2,000–£4,000 | 2.2x |
| 3-pane bifold (3m) | £3,500–£7,000 | £9,000–£15,000 | 2.1x |
| Whole 3-bed house (uPVC) | £7,000–£14,000 | £18,000–£28,000 | 2.0x |
Frequently asked about window cost
How much do new windows cost in London in 2026?
Fitted per-window costs in London in 2026: uPVC casement £550-£1,200; uPVC flush casement £650-£1,400; uPVC sash £900-£1,800; aluminium casement £900-£1,800; aluminium flush £1,100-£2,000; heritage aluminium £1,400-£3,000+. A whole-house 8-window replacement typically costs £5,500-£10,000 in uPVC or £8,500-£18,000 in aluminium.
How much do uPVC windows cost in London?
Fitted uPVC casement windows cost £550-£1,200 each. Flush casement £650-£1,400. Sash windows £900-£1,800. Prices include VAT, disposal, 10-year guarantees. National firms typically quote 2-3x higher.
How much do aluminium windows cost in London?
Fitted aluminium casement windows cost £900-£1,800 each. Flush sightline £1,100-£2,000. Picture windows £1,200-£2,500. Heritage steel-look £1,400-£3,000+. Aluminium costs 50-80% more than equivalent uPVC but gives 30-40+ year lifespan.
How much does a whole-house window replacement cost?
Typical London terraced house (8 windows): £5,500-£10,000 uPVC, £8,500-£18,000 aluminium. 3-bed semi (10-12 windows): £7,000-£14,000 uPVC, £12,000-£25,000 aluminium. Conservation properties cost 10-25% more.
How much do bifold doors cost in London?
3-pane aluminium bifold: £3,500-£7,000. 5-pane: £5,500-£10,000. Premium systems (Schüco FD-75/90, XFOLD120) add 30-50%. Structural opening prep adds £1,500-£4,000 if required.
How much do sliding patio doors cost in London?
2-pane aluminium sliding door: £4,000-£8,500. 3-pane: £6,000-£12,000. Ultra-slim systems (APX20 Plus 25mm, Cortizo Vision 20mm) sit at the top. Motorised TipTronic adds roughly £2,500-£4,000.
What affects window cost the most?
Five biggest drivers: frame material (aluminium 50-80% more than uPVC); glazing spec (triple +15-25%, acoustic +20-30%); colour/finish (+10-20%); size and shape (bay +30-50%); fitting complexity (scaffolding, lintels +£500-£2,000).
Are FENSA-registered installers more expensive?
No — we price the same or lower than non-registered trades. FENSA registration (we are Reg 40373) means every installation is self-certified for Building Regulations Part L without separate building control inspection. National sales firms charge a premium for commission and finance margins, not registration.
How much do windows cost in a London conservation area?
Conservation area installations (Bedford Park, Strawberry Hill, Richmond Green) cost 10-25% more due to heritage-compliant profiles, Article 4 planning permission (£240+), and listed building consent where applicable. Budget £6,000-£15,000 for a typical terrace.