You may need your home address and MPRN, proof of ownership or occupancy, property details such as its construction date, and bank or payment information where relevant. Some applications may also require identification, tax details, or a BER assessment, depending on the grant route and whether you are applying directly or through a registered contractor. Document requirements can change, so check the current SEAI guidance before starting work. Your registered contractor or SEAI can confirm exactly what applies to your circumstances.