Window grant eligibility

The basic rules

• An MPRN, and a home built and occupied before 2011 (seai.ie).
• You're replacing existing single-glazed or older double-glazed windows.
• New windows reach a U-value of 1.4 W/m²K or better.
• You use an SEAI-registered contractor.

What the Heat Loss Indicator is

A Building Energy Rating (BER) assessment works out how much heat your home loses through its walls, roof, floor, windows and doors, and through draughts. The Heat Loss Indicator (HLI) puts that into one number. The lower the HLI, the better your home holds its heat.

SEAI wants homes to hold heat reasonably well before it pays for new windows, so the windows make a real difference. For the windows and doors grant, your home must reach a Good or Very Good rating for heat loss on the BER advisory report: an HLI of 2.3 or lower. If the BER advisory report already rates your roof and walls as Good, that meets the requirement too (seai.ie).

How to check your BER

1. Find your MPRN.It's on your electricity bill.
2. Look up your BER.BER certificates and advisory reports are on the national BER register, which you search with your MPRN (SEAI, 20 Feb 2026).
3. Read the advisory report.Look for the heat loss rating, and how your roof and walls are rated.
4. No BER, or an old one.A BER assessor can review older reports or carry out a pre-works BER (SEAI, 20 Feb 2026).
5. Not Good enough.Insulate first. A home that upgrades its attic or wall insulation can then qualify.

If you already had an insulation grant

SEAI says a previous SEAI grant for attic or wall insulation also counts towards showing your home has adequate insulation (SEAI, 20 Feb 2026). If you got one, tell your contractor and BER assessor.

Who usually passes, and who doesn't

• Likely to pass: homes with an insulated attic and filled cavity walls, or homes that have had an SEAI insulation grant.
• Likely to need work first: homes with little attic insulation, empty cavity walls or uninsulated solid walls.

Attic and wall insulation have their own SEAI grants. For cavity walls, our sister site cavitywallinsulation.ie shows the grant by home type.

The post-works BER

After the windows or doors go in, a BER assessor does a post-works BER. It's required for the grant, and it's grant-aided. It records the improvement the new windows made.

Homes built or occupied from 2011

The SEAI grant isn't open to homes built or first occupied from 2011. They were built to stricter energy rules. You can still get a price for new windows, and if you're 66 or over, see window grants for over 66s.

Questions people ask