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 | Apex Heritage 2500 | £550 | £1,200 |
| Flush casement | Apex Heritage | £650 | £1,400 |
| Tilt & turn | Apex Tilt & Turn | £700 | £1,500 |
| French casement | Apex Heritage 2500 | £750 | £1,600 |
| Bay / bow window | Apex Heritage 2500 | £1,800 | £4,500 |
| Sliding sash | APX Heritage / Liniar Sash | £1,200 | £2,400 |
| Heritage (period profile) | Apex 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 | £6,000 | £10,000 |
| 4-pane bifold | up to 4m | £8,500 | £13,000 |
| 5-pane bifold | up to 5m | £11,000 | £16,000 |
| 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 | £4,500 | £7,500 |
| 3-pane slider | up to 6m | £6,000 | £10,800 |
| APX20 Plus (20mm interlock) | 3-pane | £6,000 | £9,000 |
| Cortizo Cor Vision (20mm interlock) | 3-pane | £7,200 | £10,800 |
| 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
Six variables do most 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 (£548 in England from 1 April 2026). Plan for 10-25% premium and 4-8 week extra lead time for approval.
Price compared to national firms
National installers such as Anglian and Everest typically quote materially 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) | £6,000-£10,000 | £9,000-£15,000 | 1.5x |
| 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 £1,200-£2,400; 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 £1,200-£2,400. Prices include VAT, disposal, 10-year guarantees. National firms typically quote considerably 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: £6,000-£10,000. 5-pane: £11,000-£16,000. Premium systems (Schüco AS FD 75/90) add 30-60%. Structural opening prep adds £1,500-£4,000 if required.
How much do sliding patio doors cost in London?
2-pane aluminium sliding door: £4,500-£7,500. 3-pane: £6,000-£10,800. Ultra-slim 20mm-interlock systems (APX20 Plus, Cortizo Cor Vision) 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 (£548 in England from 1 April 2026), and listed building consent where applicable. Budget £6,000-£15,000 for a typical terrace.