The SEAI windows and doors grant pays up to €4,000 for a complete window upgrade (detached house) and €800 per external door, up to two doors (€1,600). It's the newest SEAI home energy grant — homeowners who ordered or started window upgrades from the government announcement on 27 January 2026 onwards can qualify. The one rule that catches people out: your attic and wall insulation must already be in good shape before you can claim it. Amounts verified against seai.ie (2 June 2026).
Grant Amounts by House Type
| House type | Windows grant (complete upgrade) |
|---|---|
| Detached house | €4,000 |
| Semi-detached / end of terrace | €3,000 |
| Mid-terrace | €1,800 |
| Apartment | €1,500 |
The external doors grant is €800 per door, capped at two doors (€1,600 total). You can apply for windows only, doors only, or both together. A detached house doing both maxes out at €5,600.
Who Qualifies
Four conditions, all verified against the SEAI grant page:
- Your home was built and occupied before 2011. Extensions built before 1 January 2011 are also eligible.
- Your attic and wall insulation is already good. Specifically: rated "Good" or "Very Good" on your BER Advisory Report, or you've previously had SEAI insulation grants. This is the rule that disqualifies the most homes — see the next section.
- You're replacing single or double glazing with new windows achieving a U-value of 1.4 W/m²K or better.
- For the doors grant: you're replacing inefficient external doors.
Two further payment rules: the grant cannot be backdated to windows installed before the scheme opened (other than works ordered or commenced from the 27 January 2026 announcement onwards), and it's a once-off grant per home. A post-works BER assessment is required — SEAI part-funds this.
The Insulation-First Rule (Why Most Applications Fail)
SEAI's logic is straightforward: new windows in an uninsulated house are a waste of grant money, because the heat just leaves through the attic and walls instead. So the windows grant requires either:
- Attic and wall insulation rated "Good" or "Very Good" on your BER Advisory Report, or
- A heat loss indicator (HLI) of 2.3 W/K·m² or less — a measure of how fast your whole home loses heat, calculated as part of your BER
If your insulation isn't there yet, the sequence is: insulation first (grants of up to €8,000 for external wall insulation and €2,000 for attic — see our insulation grants guide), then windows. Both grants can be claimed by the same home — just not in the wrong order.
How to Apply
There are two routes, the same as every individual SEAI grant:
- Apply yourself — through the SEAI online portal (you'll need your MPRN from your electricity bill and the name of your SEAI-registered contractor). You must have grant approval before ordering windows or starting work, you have 8 months to complete the works once approved, and the grant is paid back to you after completion and inspection.
- Through a One Stop Shop — if the windows are part of a bigger home energy upgrade reaching a B rating, the One Stop Shop applies for the grant and deducts it from your bill upfront. The windows grant amounts are identical under both routes.
What It Stacks With
- Insulation grants — not just compatible but effectively required first. Insulation grants guide.
- Solar PV (€1,800) — completely separate scheme, no conflict. If you're doing windows for energy efficiency, solar is usually the next upgrade with the fastest payback — see what solar costs in 2026.
- Heat pump (up to €12,500) — separate grant; a well-sealed home with good windows is exactly what a heat pump needs to run efficiently. Heat pump grant guide.
- The full list of every SEAI grant and amount is in our SEAI grants 2026 guide.
Windows cut heat loss; solar panels cut the bill that's left. Solar Quotes Ireland matches you with SEAI-registered solar installers in your county — free quotes, no obligation, and the €1,800 solar grant plus 0% VAT still apply in 2026.
Get free solar quotes →Frequently Asked Questions
The SEAI windows grant is up to €4,000 for a complete window upgrade on a detached house, €3,000 for a semi-detached or end-of-terrace house, €1,800 for a mid-terrace house, and €1,500 for an apartment. The external doors grant is separate: €800 per door, up to a maximum of two doors (€1,600). A detached house claiming both can receive up to €5,600.
Yes. SEAI introduced a windows and doors grant — its newest home energy grant — covering homes built and occupied before 2011. It pays €1,500–€4,000 depending on house type for replacing single or double glazing with windows achieving a U-value of 1.4 W/m²K or better. Your attic and wall insulation must already be rated "Good" or "Very Good" on your BER Advisory Report to qualify.
The most common reason is the insulation prerequisite: SEAI requires your attic and wall insulation to be rated "Good" or "Very Good" on your BER Advisory Report (or a heat loss indicator of 2.3 W/K·m² or less) before it will fund new windows. Other common reasons: the home was built after 2010, the work was started before grant approval was issued, or the new windows don't meet the 1.4 W/m²K U-value standard.
Yes. Windows and doors are two parts of the same SEAI grant scheme and can be claimed together, separately, or in either order. The windows portion pays €1,500–€4,000 depending on house type; the doors portion pays €800 per external door up to two doors. Both require the same insulation prerequisite and the pre-2011 build rule.
In most homes, yes. The windows grant requires your attic and wall insulation to already be rated "Good" or "Very Good" on your BER Advisory Report, or your home to have a heat loss indicator of 2.3 W/K·m² or less. If your insulation isn't at that standard, claim the SEAI insulation grants first (up to €8,000 for external wall insulation, up to €2,000 for attic), then apply for windows. Previous SEAI-grant-funded insulation also satisfies the requirement.
No — with one exception. Windows installed before the scheme existed cannot be claimed retrospectively. The exception: homeowners who ordered or commenced window upgrades on or after the government's announcement of the scheme on 27 January 2026 are eligible, provided they meet all other requirements. For any new application, grant approval must be in place before works begin.
Published: 3 June 2026. Author: Neil Russell. Grant amounts and eligibility rules verified against the SEAI windows and doors grant page (fetched 2 June 2026) and application process rules against citizensinformation.ie (page edited 28 May 2026, fetched 3 June 2026). Grant amounts change — check seai.ie before ordering windows.