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Wall insulation grant 2026

Walls are where most homes lose the largest share of their heat. There are three routes. Cavity, internal (dry lining) and external. Each with its own SEAI grant, and each suited to a different kind of house.

UpgradeApartmentMid-terraceSemi-D / endDetached
Cavity wall insulation€700€850€1,300€1,800
Internal wall (dry lining)€1,500€2,000€3,500€4,500
External wall insulation€3,000€3,500€6,000€8,000

Standard 2026 SEAI rates, by dwelling type. Amounts are for guidance. Confirm current figures with SEAI or your installer.

Three different jobs, three different grants

Wall insulation is not one upgrade. Which one suits your house depends on how the walls were built, and the grant amounts are very different. Each has its own page with the amounts, the suitability rules and what tends to go wrong.

  • Cavity wall insulation. Cheapest and quickest where the cavity is suitable, €700 to €1,800 standard rate. Suitability is the whole question, and getting it wrong causes damp.
  • Internal wall insulation, or dry lining. €1,500 to €4,500. For homes where external work is not possible, at the cost of some room size and a lot of disruption.
  • External wall insulation. The biggest grant at €3,000 to €8,000, and the biggest change to how the house feels. Also the most expensive and the most visible.

You can now claim a second wall measure in sequence. Cavity then internal or external, or internal then external. Once external is done there is no further wall grant.

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Questions

Wall insulation grant, answered

How much is the wall insulation grant? +

Cavity wall ranges €700 to €1,800, internal dry lining €1,500 to €4,500, and external wall insulation €3,000 to €8,000, depending on your dwelling type. Welfare recipients qualify for higher cavity rates.

Which wall insulation is best value? +

Cavity wall insulation gives the best cost-per-euro if your home has fillable cavities. External wall insulation delivers the largest energy saving but costs the most, even after the grant.

Can I combine wall insulation with a heat pump grant? +

Yes, and it's often required. Your home usually needs to reach a good insulation standard before a heat pump grant is approved.