Seagrasses have faced significant historical loss due to pressures from human activities. To encourage support for, and investment in, restoring coastal ecosystems we need evidence of the effectiveness of restoration approaches and the benefits that restored ecosystems can provide. The Gulf St Vincent seagrass restoration project (SA) initiated restoration of 15ha of Posidonia and Amphibolis between 2023 - 2025. Our project investigated benefits and ecosystem services that are likely to be delivered because of the seagrass restoration. We used methods including baited remote underwater video, trawl & diver surveys, sediment core chemical analyses and oceanographic sensors to collect data on various abiotic and biotic components of the ecosystem, including the restoration site and reference sites (bare sand and nearby intact seagrass meadows). These datasets were used to demonstrate the potential for seagrass restoration projects to protect the shoreline, sequester and store carbon, provide habitat for fished species and enhance biodiversity. We also linked these benefits to recreational and economic outcomes. We compiled environmental economic accounts, exploring the use of this framework for recording changes at a project-scale. Our work provides evidence that can support investment in future seagrass restoration and environmental markets such as those based on carbon and biodiversity.