Second wall insulation grant

What you can apply for

Source: seai.ie wall insulation page, checked 28 October 2026.

No second cavity grant

If your cavity was filled with an SEAI grant before, you can't get a second grant to fill or top up the cavity. The second measure is internal or external insulation. If the old cavity fill isn't doing its job, those are the grant-aided options.

Why SEAI added it

The second measure lets homes insulated with cavity fill or dry lining upgrade further, to make the home heat pump ready. A heat pump suits a home that holds its heat well, and external or internal insulation goes further than a cavity fill alone.

Grants for a second measure

SEAI's current fixed grants for the two measures you can apply for (seai.ie, checked 28 October 2026):

Source: seai.ie wall insulation page, checked 28 October 2026.

How to apply

Through SEAI's standard application process, the same as a first wall grant. The usual rules apply: the home built and occupied before 31 December 2010, an MPRN, an SEAI-registered contractor, and all external walls fully insulated. Partial insulation isn't eligible.

1. Find a registered contractor and get quotes.Use a contractor on SEAI's register. Get a written price with VAT.
2. Apply to SEAI for a grant offer.Through the standard application process. Accept the offer before any work starts.
3. The work is done.Usually in a day for a house. All external walls must be fully insulated.
4. Post-works BER.A BER assessor rates the home after the work.
5. Submit your evidence.Send SEAI the completed paperwork from the contractor and the BER.
6. SEAI pays the grant.The fixed amount, after the work. SEAI may inspect the work.

Building Regulations: if the work alters more than 25% of the home's surface area, the home must reach at least a B2 BER, or have its heating system and attic insulation brought up to Building Regulation standard.

Before you apply

• Find your MPRN on your electricity bill. SEAI tracks grants by MPRN, so it sees the first one.
• Find the paperwork from the first job: the year, the contractor and what was done.
• Get a survey and a written price from an SEAI-registered contractor for internal or external insulation.
• Get the grant offer from SEAI before any work starts.

What we do

We pass your request to one SEAI-registered contractor who covers your area. Tell them the home had a wall grant before, and which one. They look at the walls and price internal or external insulation. You deal with SEAI on the grant itself.

Questions people ask