Flush casement windows in Ireland
A flush sash casement window costs €750 to €1,300 per window supplied and fitted in Ireland, or €6,800 to €11,500 for a full 3-bed semi-detached house (8 to 10 windows). Unlike standard uPVC windows where the opening sash juts out over the frame, a flush casement sits completely flat within the outer frame like traditional timber joinery.
How flush sash casements replicate 19th-century and 1930s timber windows without the painting, and how many homeowners save by mixing flush fronts with standard backs.
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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
€6,800 to €11,500
10 windows at €750 to €1,300 per window (13.5% VAT included)
Guide price for 10 timber-look flush sash 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 priceFlush sash vs standard stormproof (lipped) casements
| Feature | Standard lipped (stormproof) casement | Flush sash casement |
|---|---|---|
| External profile when closed | Opening sash overlaps frame with an 8mm–10mm stepped lip | Sash sits 100% flush and flat inside the outer frame |
| Corner joints | 45-degree diagonal welded mitre | 90-degree mechanical or Graf-welded timber-style butt joints |
| Typical sightline & proportions | Modern bevelled or sculptured uPVC bead | Equal sightlines (dummy sashes) to match traditional joinery |
| Weather & air tightness | Twin compression gaskets (Class 4 air / 600 Pa water) | Twin or triple centre-seal gaskets (Class 4 air / 600 Pa+ water) |
| Price per window (supplied & fitted) | €350 to €850 (white) / €550 to €1,100 (coloured) | €750 to €1,300 |
| Full 3-bed semi (8–10 windows) | €4,500 to €8,800 to €5,800 to €10,200 | €6,800 to €11,500 |
Flush casements on the front, standard casements on the back
Because most modern flush sash systems are extruded from the same 70mm or 80mm outer frame profile and foiled in the exact same RAL colours (such as Anthracite Grey, Agate Grey, Chartwell Green or Cream) as standard lipped casements, many Irish homeowners specify flush sash windows on the street-facing front elevation and standard lipped casements on the rear and side elevations. That gives the house full kerb-appeal heritage proportions at the front while saving €1,200 to €2,200 on the overall job.
Details that make a flush casement look like real timber
- Equal sightlines (dummy sashes): On a window with one opening pane and one fixed pane, the fixed glass normally looks larger because it has no sash frame. Adding a fixed 'dummy sash' makes both panes identical from the footpath.
- Mechanical timber-weld corners: Straight 90-degree vertical and horizontal corner joints replace the tell-tale 45-degree diagonal plastic weld line.
- Heritage hardware: Peg stays, monkey-tail or tear-drop handles, and deep 150mm–185mm Radlington cills complete the period look for country cottages and Victorian/Edwardian red-bricks.
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 flush casement windows as weather-tight as stormproof lipped windows?
Yes. Early 20th-century timber flush windows leaked because they had no rubber seals, but modern uPVC and aluminium flush casements use twin or triple EPDM centre gaskets and deep drainage chambers tested to 600 Pa+ wind-driven rain.
Are flush casement windows accepted in Irish conservation areas?
On non-protected period cottages and town terraces, timber-foiled flush casements with mechanical butt joints are widely used. On a listed Protected Structure or strict Architectural Conservation Area (ACA), always check with your local council's conservation officer first.
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