What attic insulation costs in Ireland
Attic insulation costs €1,800 to €2,101 for a semi-detached house, €2,400 to €2,700 for a detached house, €1,600 to €2,200 for a mid-terrace and €1,200 to €1,515 for a top-floor apartment, VAT included. After the SEAI grant, a semi-D comes to about €300 to €601.
By kind of home, by the size of the attic and by county, with the SEAI grant taken off.
Free and no obligation. Your plan goes to one contractor, not a list.
- €1,800–€2,101semi-D, before the grant
- €300–€601semi-D, after the grant
- €25–€50per m² of attic floor
- 63 m²the middle Irish roof on a BER
Our attic insulation price guide
VAT included, for work in 2026.
| Job | Cost, VAT included | After the grant |
|---|---|---|
| Attic insulation, detached house | €2,400–€2,700 | SEAI grant €2,000, so about €400–€700 to pay |
| Attic insulation, semi-detached or end-of-terrace house | €1,800–€2,101 | SEAI grant €1,500, so about €300–€601 to pay |
| Attic insulation, mid-terrace house | €1,600–€2,200 | SEAI grant €1,400, so about €200–€800 to pay |
| Attic insulation, top-floor apartment | €1,200–€1,515 | SEAI grant €1,100, so about €100–€415 to pay |
| Attic insulation, per m² of attic floor | €25–€50 per m² | Mineral wool to about 300 mm, in two layers |
Whole-home figures come from what SEAI-registered contractors were paid in 2026 and what an Irish installer charges. Per m² is installed.
What's included
- Lifting stored things off the joists, or working round them
- Eaves trays or vents so the roof stays ventilated
- Mineral wool in two layers, between and across the joists
- Lagging the water tank and pipes
- An insulated, draught-stripped hatch
- VAT on the work
What pushes it up or down
- A boarded attic floor that has to come up, or raised walkways for storage
- Downlighters in the ceiling below that need covers
- Old damp or compressed wool that has to come out first
- A small or awkward hatch, or a low-pitched roof with little room to work
- Down: dry, even insulation already there, which the new layer goes over
By home, with the grant and the higher rate
| Home | Cost | SEAI grant | Left to pay | Higher grant | Left at higher rate |
|---|---|---|---|---|---|
| Detached house | €2,400 to €2,700 | €2,000 | €400 to €700 | €2,500 | €0 to €200 |
| Semi-detached or end-of-terrace house | €1,800 to €2,101 | €1,500 | €300 to €601 | €1,900 | €0 to €201 |
| Mid-terrace house | €1,600 to €2,200 | €1,400 | €200 to €800 | €1,800 | €0 to €400 |
| Top-floor apartment | €1,200 to €1,515 | €1,100 | €100 to €415 | €1,400 | €0 to €115 |
The higher-rate grant is for first-time buyers of a home built and occupied before 2011, some people on welfare payments, and HAP or RAS landlords. Either way the grant is approved before work starts, and the contractor must be SEAI-registered. How to claim the attic insulation grant.
Plan your roof insulation
A few quick taps, and your plan fills in as you answer: the right method for your roof, what it costs, the grant and the standard to ask for. Contact details come last, and only if you want a contractor to price it.
Attic floor insulation, semi-d or end of terrace: €1,800 to €2,101 before the €1,500 SEAI grant, so about €300 to €601 to pay.
How the estimate is worked out
Attic floor insulation uses what SEAI-registered contractors were paid for each kind of home in 2026 and what an Irish installer charges, with the SEAI grant taken off. A room in the roof and a flat roof are priced per m² of the area you enter: rafter boards with a plasterboard finish, or a warm roof with a new membrane. VAT is included. Use it to plan with. It isn't a quote: a contractor prices your roof after a survey.
By the size of the attic
| Attic floor | Cost |
|---|---|
| 40 m² | €1,000 to €2,000 |
| 50 m² | €1,300 to €2,500 |
| 63 m² | €1,600 to €3,200 |
| 80 m² | €2,000 to €4,000 |
| 100 m² | €2,500 to €5,000 |
At our per m² rate, VAT included. Measure the attic floor, not the roof slope: the length and width of the house inside the outside walls, less any part that is a room. A two-storey semi is usually 40 to 55 m², a detached bungalow can be 100 m² or more. The middle roof on Irish BER certificates is 63 m².
By county, at the middle roof size
- Carlow64 m²: €1,600 to €3,200
- Cavan72 m²: €1,800 to €3,600
- Clare73 m²: €1,800 to €3,700
- Cork60 m²: €1,500 to €3,000
- Donegal75 m²: €1,900 to €3,800
- Dublin53 m²: €1,300 to €2,700
- Galway74 m²: €1,900 to €3,700
- Kerry76 m²: €1,900 to €3,800
- Kildare65 m²: €1,600 to €3,300
- Kilkenny69 m²: €1,700 to €3,500
- Laois66 m²: €1,700 to €3,300
- Leitrim74 m²: €1,900 to €3,700
- Limerick64 m²: €1,600 to €3,200
- Longford69 m²: €1,700 to €3,500
- Louth59 m²: €1,500 to €3,000
- Mayo80 m²: €2,000 to €4,000
- Meath70 m²: €1,800 to €3,500
- Monaghan64 m²: €1,600 to €3,200
- Offaly68 m²: €1,700 to €3,400
- Roscommon81 m²: €2,000 to €4,100
- Sligo65 m²: €1,600 to €3,300
- Tipperary67 m²: €1,700 to €3,400
- Waterford62 m²: €1,600 to €3,100
- Westmeath66 m²: €1,700 to €3,300
- Wexford72 m²: €1,800 to €3,600
- Wicklow67 m²: €1,700 to €3,400
The middle roof area on each county's BER certificates, priced at our per m² rate. Bungalows push the figure up in the west; terraces and apartments bring Dublin's down. Each county page has its own figures.
Top up or start again
- Top up when the wool already there is dry and level: the new layer goes across the joists over it, and the job costs less.
- Start again when it is damp, compressed, patchy or full of debris: it comes out first, which adds time and disposal.
- Leave boarding in mind: a fully boarded floor either comes up or gets raised walkways, so say if you store things up there.
- Get it in writing: the depth or U-value, the product, the eaves ventilation and the hatch, so two quotes compare like with like.
Questions before you insulate
How much does attic insulation cost in Ireland?
Attic insulation costs €1,800 to €2,101 for a semi-detached house, €2,400 to €2,700 for a detached house, €1,600 to €2,200 for a mid-terrace and €1,200 to €1,515 for a top-floor apartment, VAT included. After the SEAI grant, a semi-D comes to about €300 to €601.
How much is attic insulation per m²?
€25 to €50 per m² of attic floor, installed, VAT included.
How much will I pay after the grant?
About €300 to €601 for a semi-D, €400 to €700 for a detached house and €200 to €800 for a mid-terrace.
Is it cheaper to top up old insulation?
Yes, when the old layer is dry and even. Damp or squashed wool has to come out first.
How long does attic insulation take?
Most attics are done in a day, once the grant is approved and the attic is clear.
Every guide and county page
Methods
Costs, grants and rules
Keep the heat under your roof
Pick the roof, what's there now and the home to see the method and the cost. When you want a firm price, your plan goes to a single vetted insulation contractor for your area.