Your likely cost is the installer’s quoted price minus any SEAI grant approved for your property, but the final amount depends on the system, roof, electrical work and your circumstances. You must normally apply for and receive approval before work starts, then use an SEAI-registered contractor and complete the required paperwork. In many cases, you pay the installer and claim the grant after the work has been inspected or accepted, rather than receiving it upfront. Check the current terms on the official SEAI website and confirm payment arrangements with your registered contractor.