Cost guide
Attic insulation cost in Ireland
Attic insulation cost a median €2,101 for a semi-D, €2,700 for a detached house, €2,200 for a mid-terrace and €1,515 for an apartment on grant-funded jobs from January to June 2026. After the standard grant that leaves about €601, €700, €800 and €415.
SEAI's own medians come from the prices contractors submit when the grant is paid. VAT isn't stated, so ask for it in writing.
Free, no obligation. One SEAI-registered contractor prices it, not five.
- €2,000SEAI attic grant for a detached house
- €2,500at the higher rate
- €300 to €600typically left to pay on a semi-D
- 300 mmof wool: what SEAI's standard takes
Grant check
Your attic grant and what's left to pay
Two taps: your home, and which rate fits you. The answer is SEAI's fixed grant and its own median cost for the job.
Your SEAI attic insulation grant
€1,500
- SEAI median cost, Jan to Jun 2026
- €2,101
- Left to pay at the median
- €601
SEAI's fixed grant for a semi-d or end of terrace at the standard rate is €1,500. SEAI's median cost for attic insulation on a semi-d or end of terrace from January to June 2026 was €2,101. €2,101 less €1,500 leaves about €601. Our sum; your quote can be higher or lower.
Send this for a real priceHow this is worked out
The grant is SEAI's fixed amount for that home type and rate, as Citizens Information lists it. The median cost is SEAI's own figure from grant-funded attic jobs completed between January and June 2026; the PDF doesn't say whether VAT is in. Left to pay is the median less the grant, our sum. The home must have been built and lived in before 2011, the contractor must be on SEAI's register, and SEAI must approve the grant before work starts. It's an estimate, never a quote.
Before and after
Cost by home type, standard grant
| Home type | SEAI median cost | Standard grant | Left to pay |
|---|---|---|---|
| Detached house | €2,700 | €2,000 | €700 |
| Semi-D or end of terrace | €2,101 | €1,500 | €601 |
| Mid-terrace | €2,200 | €1,400 | €800 |
| Apartment | €1,515 | €1,100 | €415 |
Median cost of grant-funded attic insulation, January to June 2026. Left to pay is the median less the grant: our sum.
Higher rate
Cost at the higher rate
| Home type | SEAI median cost | Higher rate grant | Left to pay |
|---|---|---|---|
| Detached house | €2,700 | €2,500 | €200 |
| Semi-D or end of terrace | €2,101 | €1,900 | €201 |
| Mid-terrace | €2,200 | €1,800 | €400 |
| Apartment | €1,515 | €1,400 | €115 |
Median cost of grant-funded attic insulation, January to June 2026. Left to pay is the median less the grant: our sum.
The higher rate applies to certain welfare recipients, landlords with a HAP or RAS tenant, and first-time buyers of a second-hand home bought since 1 January 2025.
Price guide
What attic insulation typically costs
| Home type | Typical price | SEAI grant | Typically pay after the grant | What moves the price |
|---|---|---|---|---|
| Detached house | €2,400 to €2,700 | €2,000 | €400 to €700 | The biggest ceiling, eaves on four sides |
| Semi-D or end of terrace | €1,800 to €2,100 | €1,500 | €300 to €600 | What's up there now, storage |
| Mid-terrace | €1,600 to €2,200 | €1,400 | €200 to €800 | Access, a floored attic |
| Apartment | €1,200 to €1,500 | €1,100 | €100 to €400 | Getting into the roof space |
The typical price runs from what installers usually charge to SEAI's own median from grant-funded jobs. VAT isn't always stated, so ask for a written price with VAT shown.
What a fair price includes
- Wool to about 300 mm, between the joists and across them
- The eaves kept open so the roof can breathe
- A boarded walkway from the hatch to the tank
- The hatch insulated and draught-stripped
- The tank and pipes lagged
- The SEAI paperwork for your claim
What moves the price
Why one attic costs more than another
- Roof area. The median roof on a pre-2011 house's BER is 63 m², from 53 m² in Dublin to 81 m² in Roscommon. More ceiling, more wool.
- What's there now. A top-up over thin old insulation needs less than a bare attic, but the old layer has to be level and dry.
- Storage and flooring. Boards have to come up, or be raised, so the insulation can go under them. SEAI asks contractors to price clearing the attic for people who can't do it themselves.
- Ventilation. Soffit vents or eaves trays if the roof has none.
- Rafters, rooms in the roof and flat roof extensions. These cost more and SEAI expects the whole heat-loss roof done. See roof insulation.
- Repairs. A leak or woodworm is fixed before any insulation goes in.
The quote
What the written price should list
- The insulation, its depth and the U-value it reaches (0.16 W/m²K for the grant).
- The walkway, the hatch insulation and draught strip, tank and pipe lagging.
- Any vents, flooring work or clearing of storage.
- VAT, stated.
- The SEAI paperwork the contractor fills in for your claim.
Your grant
Your attic grant and a price, in 4 taps
Tap your home, when it was built, what's in the attic now and who you are. Then leave your number and one SEAI-registered insulation contractor who covers your area rings you to look at the attic and price it in writing.
FAQ
Questions people ask
How much does attic insulation cost in Ireland?
SEAI's median for January to June 2026: €2,700 detached, €2,101 semi-D, €2,200 mid-terrace, €1,515 apartment.
How much is attic insulation after the SEAI grant?
About €700 detached, €601 semi-D, €800 mid-terrace and €415 for an apartment, at the median. At the higher rate, €201 for a semi-D.
Why does a mid-terrace cost more than a semi-D?
In SEAI's January to June 2026 figures the mid-terrace median (€2,200) is above the semi-D median (€2,101). SEAI doesn't say why; medians move with the jobs done in that half-year.
Does the price include VAT?
Not always, and SEAI's medians don't say. Ask for a written price with VAT shown.
Keep reading
Related guides
- Attic insulation grant amounts 2026Every attic grant rate in one table, and what changed in 2026 by date.
- How thick should attic insulation be?300 mm, 200 mm, blown wool or boards: what reaches SEAI's standard.
- Roof and rafter insulation grantRafters, rooms in the roof and flat roof extensions: the whole-roof rule.
- How to apply for the grantSix steps, the MPRN, and the rule that loses people the grant.