Cost guide · Verified May 2026
Attic insulation cost in Ireland — typical prices + SEAI grant
Attic insulation typically costs €600–€2,000 in Ireland depending on dwelling type. The SEAI grant of up to €2,000 (standard, detached) frequently covers the full cost. Payback is fast — typically 1–3 years from heating bill savings alone.
Typical cost by dwelling type
Prices are 2026 averages for installing 300mm mineral wool or equivalent in a standard accessible attic. Difficult access, old insulation removal, or board flooring will add cost.
| Dwelling type | Typical gross cost | SEAI grant |
|---|---|---|
| Apartment | €600–€900 | €1,100 (std) / €1,500 enhanced |
| Mid-terrace | €700–€1,100 | €1,400 (std) / €1,800 enhanced |
| Semi-detached / End of terrace | €800–€1,200 | €1,500 (std) / €2,000 enhanced |
| Detached | €1,200–€2,000 | €2,000 (std) / €2,500 enhanced |
Enhanced rates apply for homeowners receiving qualifying welfare payments — see the relevant grant guide.
Worked example · 3-bed semi
Net cost after the SEAI grant
- Gross cost
- €1,000
- SEAI grant
- −€1,000*
- You pay
- ~€0
*The SEAI grant is capped at the actual invoice. Where the standard grant (€1,500 for a semi-detached home) exceeds the invoice, the grant is reduced to match.
Payback period
Attic insulation is the fastest-payback retrofit available. Heating bills drop by €200–€400/year on a typical 3-bed semi (≈10–20% of total heating cost), and the SEAI grant covers most or all of the upfront spend. Payback is usually 1–3 years from bill savings alone.
Attic is usually the first fabric measure SEAI recommends — fast payback, low disruption, and a prerequisite for several other grants (notably Windows & Doors).
Common questions
- How much does attic insulation cost in Ireland in 2026?
- Typical attic insulation cost in Ireland ranges from €600 (small apartment) to €2,000 (large detached home). The SEAI standard grant for a detached home is €2,000 — so the net cost is often €0 after the grant. Grant amounts scale by dwelling type.
- Does the SEAI attic grant ever exceed the cost of the works?
- No. The SEAI grant cannot exceed the actual invoice amount. If your installer quote is €1,400 and the grant is €1,500 for your dwelling type, the grant is capped at the invoice (€1,400).
- What is the payback period for attic insulation?
- Attic insulation is one of the fastest-payback retrofit upgrades. Typical heating-bill savings of €200–€400 per year, with the SEAI grant covering most or all of the upfront cost, give a payback of 1–3 years for most homes. The work itself takes half a day to a full day to install.
- Are higher grant amounts available?
- Yes — enhanced rates apply for homeowners receiving qualifying social welfare payments. See the attic insulation grant guide for the full per-dwelling-type breakdown.
See your exact grant amount
The navigator works out your specific grant based on dwelling type, BER and welfare status. 3 minutes, no sign-up.
Run the navigatorIndicative figures based on typical Irish market averages. Costs vary by property size, age, condition, and location. Always get at least 3 quotes from SEAI-registered contractors.