Attic insulation is the cheapest measure with the best grant coverage in the whole SEAI scheme. On completion data for the first half of 2026 the median job costs €1,515 to €2,700 depending on house type, and the grant covers most of it. If you are a first time buyer it now covers close to all of it. The confusion starts when the word attic is used for two completely different jobs.
| House | Total cost | Grant | Paid | Source |
|---|---|---|---|---|
| Detached, median completed job | €2,700 | €2,000 | €700 | SEAI, Jan to Jun 2026 |
| Semi-detached or end terrace, median | €2,101 | €1,500 | €601 | SEAI, Jan to Jun 2026 |
| Mid terrace, median | €2,200 | €1,400 | €800 | SEAI, Jan to Jun 2026 |
| Top floor apartment, median | €1,515 | €1,100 | €415 | SEAI, Jan to Jun 2026 |
| Detached, first time buyer rate | €2,700 | €2,500 | €200 | SEAI grant amounts, from 2 Mar 2026 |
| Semi-detached, first time buyer rate | €2,101 | €1,900 | about €200 | SEAI grant amounts, from 2 Mar 2026 |
| Four bed dormer, Co Galway, no grant taken | €1,400 | €0 | €1,400 | Irish Times, completed |
| 2006 build, extra attic layer, ineligible on build date | €600 | €0 | €600 | Irish Times, completed |
| 1970s four bed semi, attic line in an itemised bundle | €3,000 | part of a €20,000 package grant | not separable | askaboutmoney 2023, anonymous |
| 110 sq m dormer, attic line in a One Stop Shop quote | €9,000 | included in the net figure | did not proceed | boards.ie 2023, anonymous |
| 220 sq m dormer, sloped ceiling upgrade line | €16,193 | nil, no grant applies | €16,193 | boards.ie itemised quote, anonymous |
SEAI medians are the amounts submitted by registered contractors at grant payment across 23,412 individual upgrades completed January to June 2026. The last three rows are lines inside larger quotes, not standalone attic jobs, and they are the reason attic prices look so inconsistent online.
The first job is a cold attic. Somebody lifts the hatch, lays 300mm of mineral wool or blows in loose fill between and over the joists, insulates the hatch, fits walkway boards if you asked for them and leaves. That is the job SEAI's medians describe, and it is a day's work for two people. €1,515 to €2,700.
The second job is a sloped ceiling, a dormer, a room in the roof or a converted attic. There are no joists to lay anything on. The insulation has to go at rafter level, which means stripping and reboarding ceilings, dealing with ventilation above the insulation line, and often replacing the ceiling finish entirely. That is a builder's job over weeks.
This is why you will see attic quotes of €9,000 and €16,193 online and assume somebody is being fleeced. In one fully itemised One Stop Shop quote on a 220 square metre dormer, sloped ceiling upgrades came to €16,193 with no grant against them at all. The grant amounts on this page are for standard attic or ceiling insulation. Rafter level and sloped ceiling work is priced differently, supported differently and in places not supported at all. Before you compare anybody's attic price to yours, establish which of the two jobs you have.
The 2026 grant amounts are €2,000 for a detached house, €1,500 for a semi-detached or end of terrace, €1,400 for a mid terrace and €1,100 for a top floor apartment. Against the medians that is roughly 74 per cent, 71 per cent, 64 per cent and 73 per cent of the cost.
From 2 March 2026 first time buyers get a higher fixed amount, designed by SEAI to cover most or all of the cost: €2,500 detached, €1,900 semi-detached or end of terrace, €1,800 mid terrace and €1,400 apartment. On the detached median of €2,700 that leaves €200 to pay. Households on qualifying welfare payments also get higher fixed amounts for attic and cavity insulation.
This is the best value in the scheme and it is not close. Full detail on our attic insulation grant page, and you can add it to whatever else you are considering on the grant calculator.
Floor area of the attic, obviously, and how much insulation is already up there. A top up over existing material is cheaper than a bare joist install.
Access. A small hatch on a landing that everything has to be fed through costs more than a pull down ladder into a wide loft.
Whether you want walkway boarding, which most contractors will quote separately and which stops you compressing the new insulation with storage boxes.
Whether the attic has to be cleared first. If there is thirty years of boxes and an old water tank in the way, somebody has to move it.
Downlighters. Old fittings that penetrate the ceiling have to be fitted with covers or replaced before insulation goes over them. One documented Tipperary retrofit removed 24 downlighters as part of the works.
Attic insulation laid over the eaves vents blocks the airflow that keeps the roof space dry. The insulation works, the attic stops being warm, and the moisture that used to leave through the vents now condenses on the underside of the roof instead.
This is documented in Ireland. One homeowner had exactly that happen through a One Stop Shop job: attic insulation laid over the vents, causing condensation, on top of a list of other process failures on the same project.
Ask any contractor how they are maintaining eaves ventilation, whether they are fitting eaves trays, and whether the hatch is being insulated and draught sealed. A properly done job leaves the airflow path clear at the perimeter. It takes ten minutes to ask and it is the difference between a dry roof and a wet one.
Your home has to have been built and occupied before 2011, and you need an MPRN. Apartments qualify only if they are top floor or otherwise losing heat through the roof.
If attic insulation has already been grant funded at the same MPRN, you cannot claim again. That is worth knowing before you buy a house, because a previous owner's claim uses up your entitlement.
The build date rule catches more people than you would think. One homeowner with a house built in 2006 and 2007 paid €2,000 to pump the cavity and €600 for an extra attic layer and received nothing back, because the house was too new to qualify.
And you have to use an SEAI registered contractor. If you are not claiming, you can use anybody. A Co Galway homeowner did attic insulation at €1,400 as part of €15,700 of works with no grants at all, and was happy with the decision.
Attic insulation is the measure with the shortest payback in the scheme, the smallest bill after the grant and the least disruption. It is also a prerequisite for almost everything else, because heat leaving through a cold roof will make a heat pump work harder and a BER assessment score worse.
If you are considering a heat pump, the attic and the walls have to come first anyway to hit the heat loss threshold. If you are considering nothing else at all, this is still worth doing.
The one caveat: if you are planning a full One Stop Shop project in the next year or two, check whether doing the attic now uses up the grant that the bundle would otherwise have claimed. Ask before you book anything.
Tell us your county and we will introduce SEAI registered attic insulation installers covering your area. No cost, no obligation.
On SEAI's completion data for January to June 2026 the median is €1,515 for a top floor apartment, €2,101 for a semi-detached, €2,200 for a mid terrace and €2,700 for a detached house. With the grant applied you pay roughly €415 to €800.
€2,000 detached, €1,500 semi-detached or end of terrace, €1,400 mid terrace and €1,100 for a top floor apartment. First time buyers get €2,500, €1,900, €1,800 and €1,400 respectively from 2 March 2026, which covers most or all of a typical job.
Almost certainly because you have a dormer, a converted attic or sloped ceilings rather than a cold flat attic. That is rafter level work, not laying insulation between joists. In one itemised Irish quote the sloped ceiling upgrades came to €16,193 with no grant against them.
Yes. It is the cheapest measure with the best grant coverage, it takes a day, and it is a prerequisite for hitting the heat loss threshold if you ever want a heat pump. If you do only one thing, do this.
No. If attic insulation has been grant funded at the same MPRN before, the home is not eligible again. Worth checking before you buy.
It can if the eaves ventilation is blocked by the new insulation. This has happened on documented Irish jobs. Ask your contractor how they are keeping the eaves airflow clear, whether eaves trays are being fitted, and whether the hatch is being insulated and draught sealed.
You cannot claim the grant. One documented homeowner with a 2006 to 2007 build paid €2,000 for cavity pumping and €600 for an extra attic layer entirely out of pocket. You can still do the work, you just do it at full price and you can use any contractor you like.
Checked against the official pages on 27 August 2026. Grant terms change, so confirm current amounts with SEAI or your installer before you commit.