uPVC vs aluminium vs alu-clad casement windows
Multi-chamber uPVC is the best-value casement frame in Ireland at €350 to €850 per window (€550 to €1,100 coloured or triple glazed), thermally broken aluminium offers the slimmest modern sightlines at €700 to €1,550, and Scandinavian timber-alu-clad gives a real wood interior with zero external painting at €1,100 to €1,950.
How the three main casement frame materials compare on price, thermal U-value, frame thickness and coastal durability.
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Pick the casement frame type, approximate window count, and whether you are claiming the 2026 SEAI Windows Grant on a pre-2011 home.
Estimated supply & fit guide
€9,000 to €15,500
10 windows at €700 to €1,550 per window (13.5% VAT included)
Guide price for 10 thermally broken aluminium (or alu-clad) casement windows, supplied and fitted. Includes removal of old windows, friction hinges, multi-point locking and Part B fire-escape egress hinges on bedroom openings.
Ask a local installer for a priceuPVC, aluminium and alu-clad side by side
| Measure | uPVC casement (5 to 7 chamber) | Thermally broken aluminium | Timber alu-clad casement |
|---|---|---|---|
| Guide price per window (fitted) | €350 to €850 (white) / €550 to €1,100 (foil/triple) | €700 to €1,550 | €1,100 to €1,950 |
| Full 3-bed semi (8–10 windows) | €4,500 to €8,800 to €5,800 to €10,200 | €9,000 to €15,500 | €11,000 to €19,500 |
| Best whole-window U-value (Uw) | 0.78 to 0.85 W/m²K (triple) | 0.90 to 1.1 W/m²K (triple) | 0.75 to 0.82 W/m²K (triple) |
| Outer frame + sash sightline | 105mm to 120mm | 52mm to 70mm ultra-slim | 95mm to 115mm |
| Expected frame lifespan | 25 to 35 years | 40 to 50+ years | 45 to 60+ years |
| External upkeep | Wash with soapy water | Wash powder coat; marine-grade on coast | Zero external painting (aluminium skin) |
Choosing the right frame for your house
- Choose uPVC or Flush uPVC if: You are upgrading a 1970s–2005 semi-detached, terraced or detached family home and want the lowest U-value per euro spent. Modern multi-chamber uPVC outperforms aluminium thermally at almost half the capital cost.
- Choose thermally broken aluminium if: You have wide contemporary openings, floor-to-ceiling fixed panes beside opening casements, or want crisp 55mm architectural frames in textured matt black or bronze.
- Choose timber alu-clad if: You are building a high-spec extension, passive self-build or coastal renovation and want knot-free painted or lacquered Nordic pine or oak indoors with a clip-on powder-coated aluminium exterior. See our sister guide alucladwindows.ie for full alu-clad specifications.
What casement windows cost in Ireland
Our supply-and-fit price guide per window and for a full 3-bed semi, before and after the SEAI grant.
| Job | Typical cost | What moves the price |
|---|---|---|
| White uPVC casement window (double glazed, A-rated) | €350 to €850 per window | Uw ≤ 1.4 W/m²K · side-hung or top-hung |
| Coloured or triple-glazed uPVC casement (0.8 W/m²K) | €550 to €1,100 per window | Anthracite grey / dual-foil or 40mm–44mm triple unit |
| Flush sash casement window (flush exterior) | €750 to €1,300 per window | Sash sits flush in frame · mechanical timber-look joints |
| Thermally broken aluminium casement | €700 to €1,550 per window | Slim 50mm–65mm sightlines · powder-coated RAL finish |
| Timber-aluminium alu-clad casement window | €1,100 to €1,950 per window | Engineered pine or oak inside, maintenance-free alu outside |
| Full 3-bed semi (8–10 casement windows), white uPVC | €4,500 to €8,800 | After €3,000 SEAI grant (if eligible): €1,500 to €5,800 |
| Full 3-bed semi (8–10 windows), flush casement | €6,800 to €11,500 | After €3,000 SEAI grant: €3,800 to €8,500 |
| Full 3-bed semi (8–10 windows), aluminium | €9,000 to €15,500 | After €3,000 SEAI grant: €6,000 to €12,500 |
Real examples and installation detail
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Questions homeowners ask
Are aluminium casement windows warmer than uPVC?
No. Even with a polyamide thermal break, multi-chamber uPVC and timber-alu-clad frames have slightly lower thermal conductivity than aluminium. People choose aluminium for its strength, slim 55mm sightlines and 45-year powder-coated lifespan rather than raw U-value.
Does grey uPVC fade in the sun?
Modern Renolit and Hornschuch architectural foils used on Irish uPVC windows reflect infrared heat (Solar Shield technology) and carry 10- to 15-year colourfast guarantees against peeling or fading.
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