London · Q2 2026
Aluminium Windows in
London.
Aluminium window systems we fit
We install on four aluminium window platforms. Each has a specific strength — thermal performance, slim sightlines, security, or period aesthetic.
| System | Best for | U-Value | Sightline | Guarantee |
|---|---|---|---|---|
| Schüco AWS 70.HI | Passivhaus, acoustic performance | 0.84 W/m²K | 77 mm | 20 years |
| Schüco AWS 75.SI+ | Flagship premium | 0.76 W/m²K | 77 mm | 20 years |
| APX Casement | Standard modern casement | 1.4 W/m²K | 80 mm | 10 years |
| Smart Alitherm 300 | Architectural mid-range | 1.4 W/m²K | 62 mm | 10 years |
| Smart Aluspace | Crittall steel-look heritage | 1.6 W/m²K | 59 mm | 10 years |
| Cortizo Cor 60 | Large spans, slim sightline | 1.3 W/m²K | 45 mm | 10 years |
| Cortizo Cor 70 Industrial | Slimmest sightline available | 1.2 W/m²K | 45 mm | 10 years |
Aluminium window prices by type
Fitted per-window prices, London, Q2 2026. All prices include VAT, frame, glazing, fitting, disposal, and FENSA self-certification.
| Window type | System | Low | High |
|---|---|---|---|
| Casement | 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) | APX Picture | £1,200 | £2,500 |
| Schüco AWS 70 | Schüco AWS 70.HI | £1,400 | £2,400 |
| Corner (structural) | APX Corner / Cortizo | £2,500 | £6,000 |
| Heritage steel-look | Smart Aluspace | £1,400 | £3,000+ |
| Heritage internal screen | Smart Aluspace | £1,200 | £2,600 |
uPVC vs aluminium — the real trade-offs
Honest comparison for London homeowners. Aluminium isn’t better — it’s different. Use uPVC where it makes sense; use aluminium where it’s genuinely required.
| Factor | uPVC | Aluminium |
|---|---|---|
| Typical U-value | 1.2 W/m²K | 1.2 W/m²K (0.84 on AWS 70.HI) |
| Slimmest sightline | 70 mm frame | 45 mm (Cortizo Cor 70) |
| Max span (single pane) | 1.5 × 2.4 m | 3.5 × 3.0 m (Cortizo) / 4.0 m+ (sliding) |
| Typical lifespan | 25–30 years | 30–40+ years |
| Price (per window, fitted) | £550–1,800 | £900–3,000+ |
| Colour range | 30+ heritage foils | Any RAL powder-coat |
| Best for | Casement, sash, bay, budget | Slim sightlines, corner, large sliders, heritage steel-look |
Where aluminium genuinely wins
Four scenarios where the 50–80% price premium over uPVC is actually worth it. Outside these, uPVC is the rational choice.
| Scenario | Why aluminium | Recommended system |
|---|---|---|
| Single-pane sliding door > 2m | Only aluminium is strong enough | APX20 Plus / Cortizo Vision |
| Corner or structural window | Frameless 90° joins need aluminium | APX Corner / Cortizo Cor 60 |
| Slim sightline aesthetic | 45mm vs 70mm uPVC minimum | Cortizo Cor 70 Industrial |
| Crittall steel-look replacement | Replicates original narrow profiles | Smart Aluspace |
| Passivhaus / net-zero spec | Schüco AWS 70.HI hits 0.84 W/m²K | Schüco AWS 70.HI or 75.SI+ |
| Large picture / floor-to-ceiling | Aluminium handles 3.5×3m panes | APX Picture / Cortizo |
Frequently asked
How much do aluminium windows cost in London?
Fitted aluminium windows in London cost £900–£1,800 per casement, £1,100–£2,000 per flush casement, £1,200–£2,500 per picture window, and £1,400–£3,000+ per heritage aluminium in 2026. Prices include VAT, frame, glazing, fitting, and FENSA self-certification. Aluminium costs 50–80% more than equivalent uPVC.
Which aluminium window brand is best?
Schüco AWS 70.HI and 75.SI+ lead on thermal performance (0.76–0.84 W/m²K U-value) and security. Cortizo Cor 70 Industrial has the UK’s slimmest aluminium sightline at 45mm. Smart Aluspace leads on period steel-look aesthetic. APX is the best value-for-money mid-range platform.
Are aluminium windows worth the extra cost?
Worth it when you need slim sightlines (45mm vs 70mm uPVC), large single spans, corner/frameless glazing, Passivhaus thermal performance, or a Crittall steel-look replacement. Not worth it for standard casement in a typical semi — uPVC delivers equivalent performance at 40–50% of the price.
What U-value do aluminium windows achieve?
Standard aluminium windows hit 1.2–1.4 W/m²K whole-window U-value with double glazing. Schüco AWS 70.HI with triple glazing reaches 0.84 W/m²K. Schüco AWS 75.SI+ with triple glazing reaches 0.76 W/m²K (Passivhaus certified).
How long do aluminium windows last?
Aluminium windows have a 30–40+ year functional lifespan. Powder-coat finish carries a 20-year colourfast guarantee (Schüco), 10 years on most other systems. Frames don’t warp, rot, or need repainting.
Can I get aluminium windows in any colour?
Yes. Any RAL powder-coat colour is available — over 200 standard shades. Matt black, anthracite grey, and bronze are most popular for contemporary installs. Heritage ivory and Chartwell Green work for period properties. Dual-colour (different inside/outside) adds 10–15%.
Are aluminium windows secure?
Yes. APX and Schüco systems meet PAS 24:2022 with multi-point locking as standard. Schüco AWS 70 RC2 hits police-preferred Secured by Design standard. Aluminium frames are inherently stronger than uPVC — harder to crowbar, no plasticiser degradation over time.
What is the slimmest aluminium window sightline?
Cortizo Cor 70 Industrial at 45mm is the slimmest UK-available aluminium window frame as of 2026. Cortizo Cor 60 at 60mm and Smart Aluspace at 59mm are next. Standard APX casement is 80mm. For comparison, standard uPVC is 70mm minimum.
Are aluminium windows good for conservation areas?
Smart Aluspace is the go-to for replacing original Crittall steel windows in conservation areas — it replicates the narrow 59mm sightlines of original steel profiles. For Georgian/Victorian properties not originally steel, uPVC Heritage or timber is usually preferred by planning officers.
Do aluminium windows cause condensation?
No, modern thermally-broken aluminium windows (all systems we fit) don’t cause condensation. Thermal break technology isolates the inner frame from the outer, keeping internal frame temperature above the dew point. Old pre-1990 aluminium without thermal breaks is the common source of condensation myths.
