Triple-glazed casement windows in Ireland
Upgrading a casement window from standard double glazing (Uw 1.2–1.4 W/m²K) to triple glazing (Uw 0.78–0.85 W/m²K) adds roughly €120 to €200 per window — bringing a triple-glazed uPVC casement to €550 to €1,100 supplied and fitted.
Why triple-glazed casement windows eliminate cold radiant downdraughts and morning condensation across Irish winters.
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Calculate your casement window & SEAI grant cost
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
€5,800 to €10,200
10 windows at €550 to €1,100 per window (13.5% VAT included)
Guide price for 10 colour-foiled or triple-glazed (0.8 W/m²K) uPVC 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 priceDouble vs triple glazed casements by the numbers
| Specification | A-rated double-glazed casement | Triple-glazed casement (36mm–44mm unit) |
|---|---|---|
| Glass unit make-up | 4mm / 16mm–20mm Argon / 4mm Low-E | 4mm Low-E / 14mm–16mm Argon / 4mm / 14mm–16mm Argon / 4mm Low-E |
| Centre-pane glass U-value (Ug) | 1.1 to 1.2 W/m²K | 0.5 to 0.6 W/m²K |
| Whole-window U-value (Uw) | 1.2 to 1.4 W/m²K (meets SEAI grant) | 0.78 to 0.90 W/m²K (Passive House standard) |
| Internal glass surface temp (at 0°C outside) | ~16.2°C | ~18.8°C (no cold radiant chill or condensation) |
| Price per window (uPVC fitted) | €350 to €850 | €550 to €1,100 |
Hardware and soundproofing on triple-glazed casements
- Reinforced friction stays: Three panes of 4mm toughened or float glass weigh 30 kg per square metre (50% heavier than double glazing). Always check the fabricator fits heavy-duty austenitic stainless steel friction stays rated for 35kg–45kg sashes so wide side-hung openers never drop over time.
- Warm-edge SwissV or Swisspacer bars: Replacing aluminium glass-edge spacers with composite warm-edge spacer bars stops the bottom 25mm perimeter of the glass misting up on frosty mornings.
- Acoustic laminated glass for busy roads: Standard symmetrical triple glazing (4/14/4/14/4) is only 1 to 2 dB quieter than double glazing because three identical 4mm panes resonate at the same frequency. If you face a busy road or flight path, ask for 6.8mm acoustic laminated outer glass paired with a 4mm inner pane (cutting traffic noise by 38 to 42 dB).
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
Do I need triple-glazed casement windows to get the SEAI grant?
No — SEAI's technical threshold for replacement windows is a whole-window U-value (Uw) of 1.4 W/m²K or lower, which good A-rated double glazing achieves. However, choosing 0.8 W/m²K triple glazing makes it much easier for your home to pass the overall BER Heat Loss Indicator (HLI ≤ 2.0 W/K·m²) required for heat pump and window grants.
Does triple glazing make rooms darker?
Modern low-iron triple glazing transmits around 71% to 74% of visible daylight compared with 79% to 81% on double glazing — a difference the human eye cannot detect once fitted.
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