SEAI grant for casement windows in 2026
In 2026, SEAI pays €4,000 for 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 towards new A-rated casement windows (Uw ≤ 1.4 W/m²K), plus €800 per external door for up to two doors.
Who qualifies, the exact U-value and BER Heat Loss Indicator rules, and how to apply before ordering your windows.
Free, no obligation. One vetted window company covering your county replies.
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
€1,500 to €5,800 after €3,000 grant
Gross price: €4,500 to €8,800 · SEAI grant: −€3,000
Guide price of €4,500 to €8,800 for 10 white A-rated double-glazed uPVC casement windows before the €3,000 SEAI Windows Grant. Available to pre-2011 homes where all windows meet Uw ≤ 1.4 W/m²K and the home passes the BER Heat Loss Indicator requirement.
Ask a local installer for a price2026 SEAI Windows Grant by house type
| Property type | 2026 SEAI Windows Grant | Typical casement window cost (uPVC) | Typical net cost after grant |
|---|---|---|---|
| Detached house (12–15 windows) | €4,000 | €6,500 to €12,500 | €2,500 to €8,500 |
| Semi-detached or end-terrace (8–10 windows) | €3,000 | €4,500 to €8,800 | €1,500 to €5,800 |
| Mid-terrace house (6–8 windows) | €1,800 | €3,200 to €6,400 | €1,400 to €4,600 |
| Apartment (4–6 windows) | €1,500 | €2,400 to €4,800 | €900 to €3,300 |
| External doors (up to 2 doors) | €800 per door | €1,600 to €3,200 per door | €800 to €2,400 per door |
For full grant application rules across both individual Better Energy Homes grants and One Stop Shop packages, see our dedicated sister guides windowgrants.ie and windowsgrant.ie.
Four rules your casement window upgrade must meet
- Built and occupied before 2011: The house must have been built and occupied before 1 January 2011 (measured by ESB MPRN connection date).
- Whole-window U-value ≤ 1.4 W/m²K: Every new casement window installed must achieve an NFRC/EN ISO 10077-1 certified whole-window U-value (Uw) of 1.4 W/m²K or lower.
- Full window replacement & HLI pass: You cannot claim the SEAI grant for changing just one or two windows while leaving old single or leaky double glazing in the rest of the house; post-works BER assessment must show the home achieves a B2 BER or passes the Heat Loss Indicator requirement.
- Grant approval before starting work: Never allow old windows to be ripped out before your SEAI Letter of Offer or One Stop Shop contract is issued.
Real examples and installation detail
Get a casement window price in 4 taps
Tap your job, house type, preferred frame and county. Your enquiry goes to one vetted window company covering your county for a free measure and written quote.
Questions homeowners ask
Can I apply for the SEAI windows grant myself or do I need a One Stop Shop?
Both routes are available. See windowgrants.ie for the comparison between standalone SEAI window grant applications and One Stop Shop whole-house upgrades where the grant is deducted upfront.
Do roof windows or dormer windows count under the same SEAI grant?
Yes. When you replace all windows under the SEAI grant, every window in the thermal envelope—including casements, dormer windows and skylights—must be brought up to the required U-value threshold.
Every guide, calculator and county page
Jump straight to any specification guide, our interactive calculator, the technical glossary or your county page.
Price & Specification Guides
Calculator, FAQ & Glossary
Replacing draughty casement windows?
One vetted window company covering your county measures every opening and gives you an itemised written quote.