Cost guide
The cost of attic and cavity wall insulation in Ireland is primarily influenced by the size of your home and the type of insulation material used. Grants from the Sustainable Energy Authority of Ireland (SEAI) can significantly reduce the upfront expense.
Typical cost in Ireland
€700 - €2,500 per job
For a typical semi-detached house in Ireland, insulating the attic can cost between €700 and €1,200. This usually covers the cost of the material (like mineral wool or fibreglass) and the labour for installation to the recommended depth of 270mm.
Cavity wall insulation for the same property typically ranges from €800 to €1,300. This involves injecting insulating material into the wall cavity. The price depends on the linear metres of external wall and whether the property is detached or semi-detached.
Factors that push the price up include the complexity of the attic space (e.g., multiple small sections, difficult access) or the need for remedial work on the existing structure. For cavity walls, the presence of obstructions or the need for external rendering repairs will increase the cost.
Conversely, smaller homes or attics with straightforward access will be at the lower end of the price range. Some quotes might include minor repairs to ventilation or boarding, while others may exclude them, so always check what's covered.
When comparing quotes, ensure they specify the type and depth of insulation, the total area or linear metres covered, and any associated guarantees. Always ask if the quote is before or after any potential SEAI grant, and confirm the installer is registered with the SEAI for grant purposes.
It's also worth noting that while the initial outlay is a consideration, the long-term savings on heating bills and the improved comfort of your home are significant benefits that offset the cost over time.
Tell us what you need — local businesses will send you actual prices, free.
Yes, the SEAI offers grants for attic and cavity wall insulation. The amount varies depending on the type of insulation and your home, but it can significantly reduce the cost.
Attic insulation typically takes one to two days. Cavity wall insulation is usually completed in one day.
Mineral wool is generally cheaper than foam for cavity walls. Foam might offer slightly better thermal performance but comes at a higher price point.
Always check if quotes include waste removal, any necessary repairs to skirting or plasterwork, and if they are inclusive of VAT. Clarify grant deductions upfront.
Prices are indicative guides only and vary by job, location and provider. Always confirm with the business.
New local businesses, deals and community news for your county — free, no spam.