Last updated 27 April 2026
Cost of Aluminium Windows London 2026
Aluminium window prices by type
Fitted prices for aluminium windows across London as of Q2 2026, including VAT, frame, double glazing, fitting, disposal of old frames and FENSA self-certification. These are real per-window ranges we quote weekly — national chains typically quote 2-2.5x higher for the same product.
| Window type | System | Low | High |
|---|---|---|---|
| Standard | |||
| Casement window | APX / Smart Alitherm 300 | £900 | £1,800 |
| Flush sash casement | APX Flush | £1,100 | £2,000 |
| Tilt & turn | APX70 / Cortizo Cor 70 | £1,100 | £2,200 |
| Picture (fixed) window | APX Picture | £1,200 | £2,500 |
| Premium | |||
| Schüco AWS 70.HI | Schüco AWS 70.HI | £1,400 | £2,400 |
| Schüco AWS 75.SI+ | Schüco Passivhaus-grade | £1,700 | £3,000 |
| Corner (90° structural) window | APX Corner | £2,500 | £6,000 |
| Heritage / Steel-look | |||
| Heritage Aluspace | Smart Aluspace | £1,400 | £3,000+ |
| Heritage internal screen | Smart Aluspace internal | £1,200 | £2,600 |
Prices by system
Same window, different system — fitted price varies by 30-80% depending on choice. Here's how the major aluminium systems we install compare on price and U-value.
| System | Tier | U-Value | Casement fitted |
|---|---|---|---|
| APX | Mid (UK-fabricated value) | 1.4 W/m²K | £900–£1,500 |
| Smart Alitherm 300 | Mid | 1.5 W/m²K | £950–£1,600 |
| Cortizo Cor 70 | Mid–premium (Spanish) | 1.2 W/m²K | £1,200–£1,900 |
| Schüco AWS 70.HI | Premium (German) | 1.0 W/m²K | £1,400–£2,400 |
| Schüco AWS 75.SI+ | Flagship (Passivhaus) | 0.7 W/m²K | £1,700–£3,000 |
| Smart Aluspace | Heritage (steel-look) | 1.6 W/m²K | £1,400–£3,000+ |
What drives the price
Five variables move the final fitted price meaningfully. If you're comparing three quotes, make sure they all spec these the same way — otherwise you're comparing apples and pears.
1. Powder-coat colour +0–25%
Standard RAL (7016 Anthracite, 9005 Jet Black, 9010 White, 7044 Traffic Grey, 6003 Olive) is baseline. Custom RAL or BS colours add 5-10%. Anodised finish adds 15-25%. Metallic finishes (Pearl, Champagne) add 10-15%. Textured matte finishes (Sablé) add 3-6%.
2. Dual colour +8–12%
Different exterior and interior powder-coat. Most popular spec is RAL 7016 Anthracite externally with white or light grey internally — keeps interiors bright while delivering the modern dark-frame exterior. Adds 1-2 weeks to lead time.
3. Glazing spec +15–30%
Triple glazing adds 15-25%, takes U-value to 0.8-0.9 W/m²K, adds 30% weight per pane. Acoustic laminated glass (40-42dB) adds 20-30%. Solar-control coatings add 5-10% on south-facing rooms. Privacy/obscure glass adds £80-£200 per pane.
4. Building access +£500–£1,800
Scaffolding for first floor and above adds £500-£1,500 per elevation. Tower scaffold for restricted access (light wells, narrow side returns) adds £300-£700. Crane lift for 6th-floor-plus or oversized panes adds £600-£1,800.
5. System tier +30–80%
Schüco AWS 70.HI runs 30-50% above APX for the same casement. AWS 75.SI+ Passivhaus runs 60-80% above. The premium buys lower U-value (1.0 → 0.7 W/m²K), tighter tolerances, and a 30+ year fabrication warranty.
6. Conservation area +10–25%
Smart Aluspace heritage profiles cost more than standard casement. Article 4 directions in conservation areas may require planning permission (£240+) and 4-8 week extra lead time. Listed buildings need consent and survey time (£400-£800).
Whole-house aluminium replacement
Typical fitted costs for full London property aluminium replacements in 2026. Aluminium runs 50-80% above equivalent uPVC — see our cost of new windows guide for the cross-comparison.
| Property | Windows | APX / Smart | Schüco AWS |
|---|---|---|---|
| 1-bed flat | 4–5 | £4,500–£9,000 | £6,500–£12,000 |
| 2-bed terrace | 6–8 | £6,500–£14,000 | £10,000–£19,000 |
| 3-bed semi | 10–12 | £12,000–£25,000 | £18,000–£32,000 |
| 4-bed detached | 14–18 | £17,000–£35,000 | £25,000–£48,000 |
| Conservation / heritage | varies | +10–25% | +10–25% |
What's included
Every fitted aluminium window quote from Apex Glazing always includes:
| Free site survey and measure-up |
| Frame, sashes, double-glazed sealed units (low-E, argon-filled) |
| Multi-point locking and high-security cylinder |
| Trickle vents and Document Q air-flow compliance |
| Powder-coated finish in any standard RAL colour (matt, satin or textured) |
| Mechanical fixing, internal and external silicone sealing |
| Removal and disposal of old frames |
| Cill replacement where required |
| FENSA self-certification (Reg 40373) — registered with your local authority |
| 10-year guarantee on frames, 5 years on sealed units |
Frequently asked about aluminium window cost
How much do aluminium windows cost in London in 2026?
Fitted aluminium casement windows in London cost £900–£1,800 each in 2026. Flush sightline systems run £1,100–£2,000. Tilt & turn £1,100–£2,200. Picture (fixed) £1,200–£2,500. Schüco AWS 70.HI £1,400–£2,400. Heritage steel-look (Smart Aluspace) £1,400–£3,000+. Corner structural windows £2,500–£6,000.
Are aluminium windows worth the price premium over uPVC?
Aluminium windows cost 50-80% more than equivalent uPVC. The premium buys: slimmer sightlines (60mm vs 100mm+), structurally stronger frames for big spans, a 30-40+ year lifespan vs uPVC's 25-30, and powder-coat colour stability for 25+ years. For period properties wanting steel-look heritage profiles, only aluminium achieves the visual.
What's the U-value of aluminium windows?
Whole-window U-values for aluminium in London in 2026: APX casement 1.4 W/m²K with double glazing, 0.9 with triple. Schüco AWS 70.HI 1.0 W/m²K, AWS 75.SI+ 0.7 W/m²K. Smart Alitherm 300 1.4 W/m²K. Smart Aluspace heritage 1.6 W/m²K. All comfortably exceed Building Regulations Part L (1.4 W/m²K minimum for replacement).
Does powder-coat colour change the price?
Yes. Standard RAL colours (Anthracite Grey 7016, Jet Black 9005, White 9010, Traffic Grey 7044, Olive Green 6003) are baseline. Custom RAL or BS colours add 5-10%. Dual colour (different inside/outside) adds 8-12%. Textured finishes (Sablé, Matt, Stuccolux) add 3-6%. Anodised finish adds 15-25%. Metallic finishes (e.g. Pearl) add 10-15%.
What's the difference between APX and Schüco aluminium windows?
APX is our value-engineered mid-tier system, fabricated in the UK with a 1.4 W/m²K U-value and 60mm sightline — strong specification at 30-40% lower cost than Schüco. Schüco AWS 70.HI is the German-engineered premium with 0.95 W/m²K U-value, RC2 security and 30+ year track record. AWS 75.SI+ is flagship Passivhaus-grade. Cortizo Cor 70 sits between APX and Schüco on price.
How much extra does dual-colour aluminium cost?
Dual-colour aluminium (different exterior and interior powder-coat) typically adds 8-12% to the standard fitted price. The popular spec is RAL 7016 Anthracite externally with RAL 9010 White or Light Grey internally — keeps the interior bright while delivering the modern dark-frame exterior look. Lead time is usually 1-2 weeks longer than single-colour.
How much does building access add to aluminium window cost?
Scaffolding for first-floor and above adds £500–£1,500 per elevation. Tower scaffold for restricted access (basement light wells, narrow side returns) adds £300–£700. Crane lift for 6th-floor-plus or oversized panes adds £600–£1,800. Mansion blocks, conservation flats and listed terraces typically need scaffolding for any window above ground floor.
Are heritage aluminium windows planning-approved for London conservation areas?
Smart Aluspace and APX Heritage are typically approved for rear elevations of conservation area properties (Bedford Park, Strawberry Hill, Richmond Green, Chiswick) and for full installations on later (1900s+) heritage properties. Listed buildings and Georgian frontages still usually require timber. Apex Glazing has installed Smart Aluspace internal screens on Grade II listed buildings under heritage consent.
What's included in an aluminium window quote?
Every fitted aluminium window quote from Apex Glazing includes: free site survey, frame and sashes, double-glazed sealed units (low-E, argon-filled, 1.2 W/m²K standard), trickle vents (Document Q compliance), powder-coated finish in any standard RAL colour, mechanical fixing and silicone sealing, removal and disposal of old frames, FENSA self-certification (Reg 40373), and a 10-year guarantee on frames, 5 years on sealed units.
