For a deep retrofit or whole-home upgrade, you may be asked for proof of identity, property ownership or occupancy, the home’s address and details, and existing BER information. Your chosen SEAI-registered One Stop Shop or contractor will usually prepare the upgrade plan, quotes and grant application, and may request additional documents such as consent forms or details of previous works. Do not begin grant-supported works until the required approval and paperwork are confirmed. Requirements can vary with the property and scheme, so check the current SEAI guidance and ask your registered provider for a complete document checklist.