How much does attic and cavity wall insulation cost in Ireland?

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.