Your One Stop Shop will usually ask for your property address, MPRN, proof of ownership or occupancy, and details of the existing home and heating system. You may also need an existing BER certificate, identification, proof of address and signed declarations or consent forms, depending on the works and your circumstances. The provider normally manages the SEAI grant application and will confirm the exact documents required before work begins. Requirements can vary, so check the latest guidance on the SEAI website and ask your registered One Stop Shop for a written checklist.