For a deep retrofit, homeowners generally begin by contacting an SEAI-registered One Stop Shop, which can assess the property and recommend a package of upgrades. The provider typically handles the grant application, but approval should be confirmed before any work starts, as starting early may affect eligibility. The works are then completed by approved contractors, followed by a post-upgrade BER assessment and the relevant paperwork. Grant availability and the final amount depend on the home, planned measures and current SEAI rules, so check the details with the provider and on the official SEAI website.