Replacing windows in Ireland typically costs €400–€700 per uPVC double-glazed window supplied and fitted, and around €4,000–€9,000 for a whole 3-bed house (indicative 2026 ranges). Triple-glazing, aluminium, timber, and large or shaped units cost more. Better windows also cut heat loss and noise, and SEAI offers a grant toward qualifying upgrades.
Cost by material and glazing
The frame material and glazing spec are the main price drivers. The table below is per standard window, supplied and fitted.
| Window type | Indicative 2026 range (per window) |
|---|---|
| uPVC, double-glazed | €400–€700 |
| uPVC, triple-glazed | €550–€900 |
| Aluminium, double-glazed | €700–€1,100 |
| Aluminium, triple-glazed | €850–€1,300 |
| Timber / alu-clad timber | €900–€1,600+ |
| Whole 3-bed house (uPVC double) | €4,000–€9,000 |
Large picture windows, bays, shaped or arched units, and feature glazing all push above these ranges. These are indicative 2026 ranges — get at least three written quotes for your exact sizes and specification.
What affects the price
- Material — uPVC is cheapest; aluminium is mid-to-high; timber and alu-clad timber are the most expensive.
- Glazing — triple-glazing costs more than double but cuts heat loss and noise further. Look at the whole-window U-value, not just the glass.
- Size and shape — large, bay, and shaped windows use more material and labour.
- Number of opening sashes — fixed panes are cheaper than multiple opening casements.
- Fitting and making good — removing old frames, fitting trickle vents, and re-plastering or sealing reveals add cost.
- Access — upstairs and awkward-to-reach windows may need scaffolding.
The SEAI windows grant
SEAI offers a window and door grant as part of its home energy upgrade supports. It is paid when you install qualifying high-performance windows through a registered contractor and meet the scheme conditions. We do not quote the amount here because grant rates change — see the official details on our SEAI window and door grant page for current eligibility, the performance standards your windows must meet, and how to apply.
Because windows reduce heat loss, replacing old single or early double-glazing can also lift your home’s energy performance — see how to improve your BER rating for where windows fit alongside insulation and heating upgrades.
Ways to save
- Use the grant. Fitting qualifying windows through a registered contractor unlocks the SEAI window and door grant — plan the spec around the scheme’s requirements.
- Do the whole house at once. Per-window pricing usually improves when fitting a full set rather than a few units.
- Match the spec to the room. Triple-glazing pays off most on cold, exposed, or north-facing elevations and street-facing rooms for noise.
- Compare like for like. When weighing quotes, check frame material, glazing, U-value, and whether making-good is included — not just the headline price.
Windows, comfort and energy
New windows do more than improve the look of a house. Modern double or triple-glazed units cut draughts, reduce condensation, and lower heat loss, which improves comfort and can support a better BER rating. If you are renovating, fitting windows is best done before interior painting and final decoration, so reveals can be made good and sealed first. For a sense of where windows sit in a larger budget, see our full house renovation cost guide.
Upgrading for warmth as well as looks? Check the SEAI window and door grant and read how to improve your BER rating.