You will generally need property and applicant details, a valid BER, and a technical assessment confirming that the home is suitable for an air-to-water heat pump. Keep the registered contractor’s quotation, grant application or reference details, invoices, receipts and completion documents, as these may be required before payment is considered. The exact paperwork can depend on the grant route and your property, and SEAI may request further evidence. Check the current requirements on the official SEAI website and confirm the document list with your registered contractor before starting work.