For standard SEAI home energy grants, the property will generally need to be an existing home built and occupied before 2011, with approval obtained before the work begins. You normally need to use an SEAI-registered contractor, and the suitable option—cavity wall insulation, internal dry lining or external insulation—depends on the wall construction and its condition. The same improvement may not qualify if it has already received public funding, and SEAI may require a post-works BER. Check the current rules on the SEAI website and ask a registered contractor to assess your home, as final eligibility is decided on the individual application.