SEAI’s published grant rates for external wall insulation vary by home type: up to €8,000 for a detached house, €6,000 for a semi-detached or end-terrace home, and €3,500 for a mid-terrace home. Apartments may have a different rate, so the property’s layout and ownership details matter. These figures are maximum advertised supports, not a guaranteed payment, and SEAI decides eligibility based on the application. Check the latest rates and arrange the work through an SEAI-registered contractor before starting.